Dissertations / Theses: 'Southern pines'

1

Knebel, Larissa. "RESIN FLOW INDUCTION IN SOUTHERN PINES: IMPLICATIONS FOR DEFENSE AGAINST SOUTHERN PINE BEETLE." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-05162005-201137/.

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The interactions between conifers, bark beetles and their common fungal associates have been widely studied, in part due to the severe economic and natural losses that occur annually. Host resistance, involving constitutive and induced defensive measures, and the factors associated with pest success are now widely understood and some losses can be avoided with proper management. Recent research with Norway spruce (Picea abies) has provided additional insight into the chemical pathways involved in host resistance, and has determined that trees exposed to mechanical wounding or fungal inoculation show acquired resistance to future pathogen attacks. This aspect of defense in loblolly pine (Pinus taeda) has not been adequately investigated. However, our recent studies indicate that fungal inoculation results in elevated resin flow levels that last up to one year after treatment. Further research in southern Appalachian pines showed that elevated resin flow occurs in response to low intensity fire, and that this response is still present at 18 months after burning. These studies indicate that acquired resistance through induced resin flow in southern pines is a possibility. Further research with beetle or fungal challenges could determine new possibilities for management of both natural and planted stands in order to maximize host defenses against southern pine beetle.

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2

Melsert, Ryan Mitchell. "Energy optimization of the production of cellulosic ethanol from southern pine." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/26557.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Dr. Sam Shelton; Committee Co-Chair: Dr. John Muzzy; Committee Member: Dr. Sheldon Jeter. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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3

Chmura, Daniel Jozef. "Linking morphology and physiology as predictors of productivity in elite families of southern pines." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2742.

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4

Oliveira, Luiz Carlos. "Mathematical model for control of high temperature drying of southern yellow pine dimension lumber." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/76523.

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Although High temperature drying (HTD) of southern yellow pine (SYP) is extensively used, quality problems still exist. Approximately 25 percent of all green lumber (2 x 4, 2 x 6 and 2 x 8's) are degraded during HTD. Warp degrade, specifically "crook", is the main cause for the loss of quality of SYP dried at temperatures above the boiling point of water. One of the major causes of warp degrade is excessive shrinkage that results from overdrying. In industrial practices, average final moisture contents for HTD of SYP lumber are usually well below the 15% MC maximum permitted by the grading rules. Overdrying the lumber causes not only lumber quality problems, but also constitutes a waste of energy. In order to improve the overall results of HTD of SYP, it is necessary to perform a better control of the process, so unnecessary extended drying can be prevented. In this study, a mathematical model based on the temperature drop across the load (TDAL) concept was proposed. The model relates TDAL to drying rates and according to the results, it appears to be an important alternative for controlling purposes during HTD of SYP.
Ph. D.

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5

Li, Xiaobo. "Breeding for improved growth, wood quality, and chemistry for southern pines by combining quantitative genetics and association mapping." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024692.

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6

Bucci, Robert Joseph. "Molecular based identification of wood decay fungi from two field sites in Mississippi." Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-06182008-141603.

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7

Heazel, Thomas Edward. "Cell wall sulfur distribution in sulfonated southern pine latewood." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/5786.

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8

Koch, David. "Syngas, mixed alcohol and diesel synthesis from forest residues via gasification - an economic analysis." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/28131.

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Thesis (M. S.)--Chemical Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Realff, Matthew; Committee Member: DeMartini, Nikolai; Committee Member: Muzzy, John; Committee Member: Sievers, Carsten.

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9

Henderson, Cynthia Joan. "A comparison of three rapid evaluation procedures for pine savanna wetlands." Master's thesis, Mississippi State : Mississippi State University, 2001. http://library.msstate.edu/etd/show.asp?etd=etd-07132001-162123.

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10

Lara-Chavez, Alejandra M. "Somatic embryogenesis in southern and tropical pine species: Loblolly pine (Pinus taeda), Longleaf pine (P. palustris) and Oocarpa pine (P. oocarpa)." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77176.

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The focus of the current project was to establish an improved and reliable protocol for somatic embryogenesis in 1) Pinus taeda and Pinus palustris; pine species of high value for commercial applications and germplasm conservation supported through breeding programs at The Virginia Department of Forestry (Chapter III); and 2) Pinus oocarpa; an economically important pine species in the southern half of Mexico and Central America (Chapter IV). In addition, 3) the study of the gene expression analysis of developmental stages of both somatic and zygotic embryos of P. taeda was compared to assess developmental fidelity at the molecular level (Chapter V). By testing four basal media combined with different plant growth regulator combinations, we have established stable embryogenic cultures from high value families of P. taeda and P. palustris using the tissue culture medium 1218 (Pullman et al 2005) in combination with an auxin:citokinin ratio at 10:5 (molar). However, optimization of the protocols for the maturation and further conversion of somatic embryos to seedlings requires further work. For P. oocarpa, we hypothesized that somatic embryo induction may be possible by mimicking natural seed-embryo developmental conditions, and a new tissue culture medium, based on the mineral content of the seed nutritive tissue (megagametophyte), was formulated. The novel culture medium (PO) was tested in combination with different plant growth regulator concentrations for the initiation of somatic embryogenesis from fresh collections of P. oocarpa immature zygotic embryos. Additionally, the established embryogenic cultures were able to mature and germinate, to our knowledge resulting in the first report of the production of P. oocarpa plantlets through somatic embryogenesis. PO medium also has the potential to be used successfully for other tropical pine species which today suffer from suboptimal somatic embryogenesis protocols. The fundamental study of molecular regulation of embryo development showed that under the current maturation conditions, P. taeda somatic embryos were temporally similar in gene expression to zygotic embryos of the same species. However, potentially important differences were found and results could potentially explain the low germination success during somatic embryogenesis. More research is still needed to further explore the natural environment of developing seed embryos to improve the somatic embryogenesis protocols and to enable full integration of this clonal propagation method into the breeding programs for pines.
Ph. D.

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11

Powers, John William. "Stand Dynamics in a Southern Appalachian Montane Pine Barren, Warm Springs Mountain, Virginia." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/34767.

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Virginia's only montane pine barren, located in the Warm Springs Mountain Nature Preserve in the Allegheny Highlands of western Virginia is likely threatened by successional changes initiated by a history of fire suppression. Dominated by early successional fire adapted species, such as dwarfed Pinus rigida (Mill.) and Quercus ilicifolia (Wangenh.), this shrubland is home to numerous rare plants and invertebrates. We used vegetation analysis and dendrochronology to document establishment and recruitment patterns and to identify successional trends at this site. Tree establishment of the dominant tree species (P. rigida and Quercus rubra L.) peaked following the last known fire event in the early 1930s. Vegetation analysis revealed an absence of P. rigida seedling recruitment as well as a low density of fire adapted species such as Q. ilicifolia. In contrast, Q. rubra is represented in a variety of age classes and shade tolerant trees such as Acer rubrum (L.) and Pinus strobus (L.) are beginning to establish. A dense understory of ericaceous shrubs and a thick litter layer appear to inhibit recruitment of P. rigida and other early successional species pointing to the need for active management in the form of prescribed burns, which have been effective in other pine barrens.
Master of Science

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12

Granger, Gregory. "Relationships between Potential Rooting Depth, Tree Growth, and White Pine (Pinus Strobus L.) Decline in Southern Maine." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/GrangerG2004.pdf.

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13

Fries, Megan L. "Relationships between Rooting Restrictions, Radial Growth, and Drought Stress with White Pine (Pinus strobus) Decline in Southern Maine." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/FriesML2002.pdf.

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14

Nistal, Franca Frederico Jose. "Nondestructive Evaluation of Southern Pine Lumber." Thesis, Mississippi State University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10288887.

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Southern pine (SP) lumber is the primary softwood material in the United States. The main procedure during lumber grading process is the identification of the strength reducing characteristics that impacts the modulus of rupture (MOR). Non-destructive evaluation technology can be used to identify higher-stiffness material. This study investigated the use of vibration methods to evaluate the mechanical properties of southern pine lumber. Significant correlations between the properties determined by non-destructive techniques and the static MOE were found. No strong correlations were found for MOR because it is related to the ultimate strength of material, often associated with the existence of localized defects, such as a knot. Non-destructive measurements, visual characteristics, and lumber density were used as independent variables. Linear models were constructed to indirectly estimate the MOE and MOR. The variables selected was dynamic modulus of elasticity (dMOE) to predict MOE. Adding density and knot diameter ratio to the model it was possible to develop a prediction model for MOR. It was possible to improve predictability of strength (MOR) with a combination of non-destructive and knot evaluation.

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15

Filgueira, Amorim Franca Tamara Suely. "Southern Yellow Pine In-Grade Lumber Evaluation." Thesis, Mississippi State University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10289581.

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The southern pine species group is the main softwood resource used in the U.S, and the majority of southern pine is used in lumber production. The use of lumber in structural purpose requires feasible strength and stiffness grading method ensuring characteristics allowable stress values. The stiffness and strength of most of southern pine lumber is assessed using visual grading system. The objective of this study was to evaluate a production weighted sample of 2 × 4, 2 × 6, 2 × 8, and 2 × 10 No. 2 grade southern pine lumber collected across its geographic range. The results of this research show a snapshot of the material commercially sold in the southern U.S. region. Over one third of the specimens contained pith, and had an average mean value of 4.6 for number of rings per inch (RPI) and 43.8% for latewood (LW). The overall specific gravity (SG), modulus of elasticity (MOE) and modulus of rupture (MOR) were 0.54, 10.1 GPa, and 41.7 MPa, respectively. The allowable design bending strength (F_b) for 2 × 4, 2 × 6, 2 × 8, and 2 × 10 was 11.2, 9.2, 8.1, and 7.1 MPa, respectively. Specimens containing no pith, RPI higher or equal then 4.0, and LW higher or equal then 33.0% were greater in MOE and MOR. The effect of grading controlling characteristics of the material was also studied. The presence of knots had the most significant impact on mechanical properties. Specimens with wane and shake had greater SG, MOE, MOR, F_b values than specimens with others grading controlling characteristics. The mean values found for RPI, LW, and SG met the requirements recommended for southern pine No. 2 lumber. The MOE and F_b values found therein met the previous and the new allowable design value. The results of this research can be used to identify and to select the best variables to improve the prediction of bending properties of visually graded lumber.

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16

Everett, Richard Gobin. "A biosystematic survey of Sierra Lodgepole pine (Pinus contorta var. murrayana [Critchfield]) populations in the transverse and peninsular ranges of Southern California." CSUSB ScholarWorks, 1997. https://scholarworks.lib.csusb.edu/etd-project/30.

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17

Swiatlo, Jeffrey A. "Analysis of shear damage to southern pine lumber." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53188.

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This study was conducted as a second part in the shear damage research project at Virginia Tech. The objectives were to verify the results obtained by Gallagher (1984) in the first study under normal mill operations as well as develop a method to compare and evaluate the extent of shear damage in relation to other defects present in southern pine lumber. This was accomplished through two sawmill studies and two kiln cart surveys performed in different geographic locations. Visible indicators such as stump-pull that are used to determine shear damage extent are often misleading. Stump-pull, used as a scaling deduction for shear damage, does not fully determine the extent of shear damage present. Shatter is often present in greater amounts over the cross section of the butt of the log. The recommendation of six inches of butt trim that was determined to minimize value losses in the first study is supported by the results obtained in this research. A trim of six inches removed 94 to 99 percent of shear damage in this study. Defects other than shear damage were present on dried and surfaced lumber. Drying checks and splits along with shake were often observed on the lumber ends. These defects often extend further up on the lumber ends, past the seven inch simulated trim. Shake was determined to be the limiting defect. Shatter, in the absence of shake, was determined to be limiting. Kiln cart surveys conducted at mills that utilize a large percentage of sheared logs can be an inexpensive and effective tool to enable mill personnel to determine the extent of shear damage in relation to other defects present on lumber ends based on green trim already taken.
Master of Science

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18

Fahlvik, Nils. "Aspects of precommercial thinning in heterogeneous forests in southern Sweden /." Alnarp : Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/200568.pdf.

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19

Gutiérrez, Emilia. "Dendroclimatological Study of Pinus Sylvestris L. in Southern Catalonia (Spain)." Tree-Ring Society, 1989. http://hdl.handle.net/10150/261879.

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Two modem tree-ring width chronologies of Pinus sylvestris L. have been established in an area near the southern limit of the species' distribution. Trees were sampled in the South of Catalonia in northeastern Spain where Mediterranean climatic conditions are of primary influence. To better understand climate ring-width relationships, tree-ring index series have been studied in relation to local climate. Ring-widths are strongly related to low precipitation at the beginning of the growing season in March, in June of the current growth year, and in September prior to tree-ring growth. High temperatures mainly affect growth in summer during the growing season and in autumn of the year prior to growth. During the winter, mainly in December, mean monthly temperatures show a significant positive correlation with growth. Major factors controlling the southern distribution of P. sylvestris may be related not only to water stress in summer but also to the amount of precipitation at the beginning of the growing season and in autumn, even in mild winters.

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20

Jones, Phillip Daniel. "Effects of five different intensities of stand establishment on wildlife habitat quality and tree growth in loblolly pine (Pinus taeda) plantations in southern Mississippi." Diss., Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-03192008-095948.

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21

Petty, Saul David. "The use of mobile mapping technology to automate surveying and monitoring of southern pine beetle." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2342.

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The USDA Forest Service, Forest Health Protection, is responsible for maintaining an ORACLE database named the Southern Pine Beetle Information System (SPBIS). SPBIS was designed to store survey data for Southern Pine Beetle (SPB) infestations on federal land across the southern United States. The main purpose of this project is to improve the SPBIS database to aid in management of SPB infestations to reduce losses, to harvest compromised timber while it still has value, and to assist resource managers in preventing further infestations from becoming established. The SPBIS mobile mapping system addresses current problems with the database and offers viable solutions to each. Mobile mapping technology is a versatile tool, which is used to collect field data, with unique geospatial time tags and attributes, for integrating into or updating a GIS (Rasher 2001). The ability to efficiently collect data is essential to developing a useable database. The time required to manually enter data into the database is substantial. Ranger district personnel often do not have the time or the desire to enter data. Currently, the database is lacking years of survey and infestation data due to these negligent data entry practices, limiting the usefulness database. Currently, SPBIS data is recorded on a paper survey form. This system introduces a digital version of this form. A time study conducted to define the efficiency of each survey showed that the digital form to be more efficient with a Mann-Whitney p- value of 0.004. A comparative study was conducted to define the difference between currently estimated SPB infestation acreage and those measured using GPS. A Mann-Whitney pvalue of 0.000 shows the significant difference between the two acreage values. GPS measured acreage proved to be more accurate thus promoting the use of GPS for measuring acreage. Navigation us ing GPS coordinates was successful and will greatly decrease the time required to locate a SPB infestation on the ground. This thesis describes a mobile mapping system designed specifically to remedy the problems associated with SPBIS. This system eliminates the need for manual entry of field-collected data, while improving field data collection in terms of efficiency and accuracy.

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22

Skinner, Michael D. "Potential effects of technical assistance foresters on pine planting on non-industrial private forestland in the South." Thesis, Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/74535.

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Over the next few decades, timber harvest levels on the South's non-industrial private forestlands (NIPFs) are projected to increase by 40 percent. These ownerships include 75 percent of the commercial timberland in the South, and account for 64 percent of the timber volume harvested in the region annually. Long-term sustained yield of softwood timber volumes from NIPFs depends on successful reforestation of harvested pine stands and afforestation of marginal agricultural lands. Available technical assistance is regarded as a significant factor in NIPP tree planting accomplishment. This study compares technical assistance available to NIPFs from various sources and attempts to measure response to technical assistance in terms of acres planted. Four sources of technical assistance are considered: state forestry agencies, consulting foresters, industry landowner assistance departments, and industry procurement staffs. Extensive south-wide surveys of technical assistance available from these four sources were conducted to determine the types and degrees of assistance available. Cross-sectional comparisons were made between 29 sub-state zones in 12 southern states to explore variation in NIPF acres planted attributable to variation in technical assistance. The surveys located just under 2,000 foresters having some professional involvement with southern landowners in 1985. The number of consulting foresters operating in the South seems to be growing, while the number of landowners enrolled in industry landowner assistance programs (LAPs) is also increasing. Assistance available to NIPF owners from all sources ranges from advice and recommendations to actual performance of site preparation and tree planting. The types and intensities of technical assistance are variable both within and across forester types. A cross-sectional statistical analysis using multiple linear regression was unable to demonstrate a significant south-wide effect of technical assistance on NIPF tree planting. Within the range of technical assistance presently available, variation in technical assistance did not prove to be a significant predictor of tree planting accomplishment. The results of this study indicate that diversity in the NIPF population, combined with diversity in silvicultural and market potential pine production, prevents quantification of a regional effect of technical assistance. A positive correlation between forester numbers and NIPF tree planting accomplishments was found. But only timber harvest levels and cost share expenditures were significant predictors of acres planted in multiple variable models.
Master of Science

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23

Heuss, Molly. "Evaluating The Impacts Of Southern Pine Beetle On Pitch Pine Forest Dynamics In A Newly Invaded Region." ScholarWorks @ UVM, 2018. https://scholarworks.uvm.edu/graddis/828.

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Southern pine beetle (SPB; Dendroctonus frontalis Zimmerman), a native insect that has historically affected pine ecosystems in the southeastern U.S., has recently expanded northward causing extensive tree mortality in pitch pine (Pinus rigida) and pitch pine-oak (Quercus spp.) forests across much of eastern Long Island, NY. Given the historic lack of SPB within these fire-dependent ecosystems, little is known regarding its impacts to forest composition, forest structure, or fuel loading. This study examined the short-term effects of SPB-induced tree mortality on the structure, composition, and fuel loading of pitch pine and pitch pine-oak communities to inform management recommendations and projections of future forest conditions and fire hazard. Overstory pine basal area declined following SPB infestation and infestation suppression management, particularly in pitch pine forests. These treatments did not impact the density or composition of seedlings and saplings, with hardwood species, including scarlet oak (Quercus coccinea), scrub oak (Quercus ilicifolia), and black gum (Nyssa sylvatica), making up the majority of species in this layer and pine representing <6% of stems. Likelihood of herbivory was influenced partly by species, with pitch pine less likely to be browsed than white oak and scarlet oak. SPB infestation significantly increased the snag component of both forest types, which largely became downed coarse woody debris (CWD) following suppression management. Treatments did not significantly influence understory species assemblages. Understory communities in pitch pine stands were characterized by Vaccinium angustifolium prior to SPB or suppression management, with these disturbances leading to an increase in the diversity of understory communities. In contrast, infestation decreased variation in understory species assemblages in pine-oak forests and encouraged regeneration of pitch pine and scarlet oak, while suppression increased diversity largely through increases in disturbance-adapted species, such as Smilax rotundifolia. SPB infestation decreased the biomass of live fuels and subsequently increased loading of dead fuels in both forest cover types. Suppression management felled preexisting and SPB-generated snags, especially in pitch pine forests, transforming vertical fuels into horizontal CWD. Collectively, results indicate SPB could functionally eliminate pitch pine without additional management intervention to maintain this species. Suppression efforts to reduce SPB impacts may accelerate succession towards hardwood dominance, particularly in pine-oak stand, leading to dramatic shifts in forest conditions across the Long Island Pine Barrens. SPB and suppression management significantly increase dead fuel loading and felling of snags during suppression served to decrease the density of ladder fuels effectively decreasing the risk of crowning. However, heavy CWD loading may also promote volatile fire behavior. Therefore, forest managers must weigh the expected potential impacts of SPB relative to changes to fuel structure and composition generated by suppression management activities. Our results demonstrate short-term effects of SPB and suppression management. Given the limited experience with SPB in these forests and the results of this study, further research on fire behavior effects and patterns of stand development over the long-term are needed.

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24

Snow, Roger Dustin. "THE EFFECTS OF SILVICULTURE ON THE WOOD PROPERTIES OF SOUTHERN PINE." MSSTATE, 2007. http://sun.library.msstate.edu/ETD-db/theses/available/etd-06142007-162915/.

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The ability to predict wood properties would aid in the growing of southern pine timber for specific end uses. Three wood properties, specific gravity, shrinkage, and knottiness, were chosen as the focus of this study. Silvicultural studies focusing on southern pine management were researched for any information on their impacts on wood properties. The information from silvicultural studies was then used to evaluate growth and yield models for ease of adaptation to predict wood properties. The information necessary to predict all wood properties is not currently available. Although, specific gravity has significantly more information available than the other properties and it is probably the most predictable.

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25

Mirabile, Kyle Vincent. "Investigating Differences in Douglas-fir and Southern Yellow Pine Bonding Properties." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/56970.

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Differences in southern yellow pine (represented by Pinus taeda) and Douglas-fir (Pseudotsuga menziesii) mature and juvenile wood were examined in terms of density, chemical composition, surface energy, shear stress, % wood failure, and delamination. Density was measured using a QTRS density scanner. Loblolly pine contained a higher average density. Chemical composition was measured using the NREL standard for identifying the chemical composition of biomass. Southern yellow pine contained a higher % hemicellulose, lignin, and extractives. Douglas-fir had higher % cellulose than southern yellow pine. Surface energy was measured using the static sessile drop contact angle method and the acid/base approach. Southern yellow pine contained a lower average contact angle than Douglas-fir. Shear stress, % wood failure, and durability were measured using ASTM-D2559 with two adhesives, a one-part moisture cure polyurethane (PU), and a two-part ambient curing phenol-resorcinol-formaldehyde (PRF). Shear stress for southern yellow pine was affected the most by the type of growth regions at the bond (juvenile to mature wood) and the assembly times of the adhesives used. Douglas-fir shear stress was affected by the type of adhesive and the growth region at the bond. Delamination results demonstrated that when using PRF the southern yellow pine has less delamination statistically than Douglas-fir. Also, the growth region at the bond with both adhesives showed to impact delamination with juvenile to mature wood having less delamination than mature to mature wood.
Master of Science

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26

Satterlee, Sarah Melissa. "Evolution of the southern pine beetle legacy simulation model "SPBMODEL" using genetic algorithms." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35907.

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SPBMODEL, a legacy southern pine beetle (SPB) simulation model, was translated into a new JavaTM model called Javahog. The Javahog output was verified to be essentially identical to SPBMODEL output by means of standard and paired t-tests. Javahog was placed online and is currently accessible via a servlet. Genetic algorithms (GAs) were applied to the Javahog model. GAs are a type of optimization heuristic that operate as an analog to evolution. GAs "evolve" a very good solution to a complex problem. In this case, GAs were intended to evolve a very good version of SPBMODEL. GAs were applied in part to improve upon the SPBMODEL design, and in part to demonstrate that GAs are effective tools for recalibrating legacy simulation models. Beyond simply recalibrating model parameters, the GA was used to select optimal functional forms for the development rates of each SPB life stage. The GA evolved a model that performed better than SPBMODEL at predicting observed field data, according to a balanced fitness function and according to sums of squared errors. However, from a visual comparison of the output of both models versus observed field data, neither model achieved satisfactory performance.
Master of Science

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27

Malimbwi, Rogers Ernest. "A growth and yield model for Pinus patula at Sao Hill, southern Tanzania." Thesis, University of Aberdeen, 1987. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU006855.

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Using data from temporary and permanent sample plots various functions describing different stand parameter relationships were developed for P. patula growing at Sao Hill, Southern Tanzania. The functions include equations for: a Weibull diameter distribution, a single tree diameter increment, stand basal area, mortality, and height/diameter relationship. Also site index curves based on a Chapman-Richards equation were constructed, and a compatible taper/volume estimation system was developed. The functions were integrated into a micro-computer model SIMUL in BASIC language. The model is capable of estimating saw-log and pulp-log volumes for different spacings and thinning regimes. Inputs to the model are: initial and simulation ages, stocking/ha, stand mean and standard deviation of diameter at breast height (dbh), basal area/ha, site, dominant height, and minimum diameters and lengths of saw-logs and pulplogs. The output gives yearly values/ha for; stocking, total volume, total basal area/ha, means for dbh, height and tree volume, mortality number and volume/ha, and volumes of saw-logs and pulplogs as out-turn from subsequent thinnings and the final clearfelling. Validation with independent data showed that the model works satisfactorily. Experimental runs at different levels of spacing and thinning regimes suggested that the current thinning schedule at Sao Hill is too heavy and results in loss in total volume. The highest utilizable volumes (mainly saw logs) may be obtained by using the current spacing of 2.7 x 2.7m followed by one thinning at the age of about 11 years to leave about 1100 stems/ha, with a rotation age of 25 years. This treatment is also justified economically giving the highest present value at an interest rate of 3%. The current rotation age 15 years (unthinned) for the production of pulp wood only is ideal to produce the required dimensions (10-20 cm diameter) of pulp logs. SIMUL is recommended for use at Sao Hill and the technique may be adopted for other plantation species in Tanzania with new parameter estimates for the equations.

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28

Shoemaker, Douglas A. "Remote sensing and simulation to estimate forest productivity in southern pine plantations." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011384.

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29

Belonger, Paul J. "VARIATION IN SELECTED JUVENILE WOOD PROPERTIESIN FOUR SOUTHERN PROVENANCES OF LOBLOLLY PINE." NCSU, 1998. http://www.lib.ncsu.edu/theses/available/etd-19981027-102102.

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BELONGER, PAUL JAMES. Variation of selected juvenile wood properties in four southern provenances of loblolly pine. (Under the direction of Steven E. McKeand.)Gravimetric wood density, x-ray densitometry, and latewood tracheids were used to investigate the relative importance of genetic and environmental effects on various assessments of wood density, tracheid characteristics, and growth traits in loblolly pine (Pinus taeda L.). Breast-height wood samples were taken from four 12-year-old plantings of a genetics trial that included approximately 50 open-pollinated families of loblolly pine from diverse sources. The densitometry and tracheid analysis included wood samples from only two of the test sites and assessed variation in 51 families, and 38 families, respectively. Moderate provenance differences, but strong family and environmental differences were found for wood density and volume, and the pooled genetic correlation between volume and density was -0.30. The Atlantic Coastal and Lower Gulf sources had higher average wood density than the Marion County and Gulf Hammock sources, and the Lower Gulf source had the lowest stem volume. Provenance variation in wood density was not consistent with geographic trends indicating a need for field testing in the area of intended deployment. Location effects were very important and sites which promoted high volume production also appeared to cause low wood density. Strategies are available to combat the unfavorable negative environmental correlation (-0.91, P < 0.01) between stem volume and wood density. Provenance variation was important for disk densities of early ring segments, but diminished with age and was not significant (P > 0.10) beyond the segment consisting of rings 3-6. Pooled narrow-sense heritability estimates for the consecutive-ring group disk densities ranged from 0.142 to 0.225, and all groups were highly correlated with average (tree) disk density (rA > 0.90). Mean latewood density and mean latewood percent both showed a strong positive genetic correlation with average disk density and the disk density of the ring 3-5 segment. Early selection for disk density can be effective.The transition to "mature" wood occurred at ring number 5.9 at the flatwoods location with higher wood density and ring number 8.9 at the upland test site with lower density. The point of transition also showed a strong provenance component (P < 0.05); the higher density Atlantic Coastal and Lower Gulf Coastal Plain sources transitioned sooner than the lower density Gulf Hammock and Marion County sources. Trachied length, total diameter, lumen diameter, and cell wall thickness were measured using outer-ring latewood tracheids. Of the trachied traits, only cell wall thickness showed a marginal location effect (P < 0.10). Measured in the middle-third of the cells, tracheids sampled at the Florida location were about 11% larger in total diameter, lumen diameter, and cell wall thickness, but no difference was detected for tracheid length. Provenance differences were strongest for cell wall thickness (P < 0.01) and marginally important for tracheid length (P < 0.16) and total cell diameter (P < 0.18).Variation among families within provenances was large (P < 0.01 for all tracheid traits) and resulted in relatively high narrow-sense heritability estimates of 0.58 for length, 0.34 for total diameter, 0.22 for lumen diameter, and 0.37 for cell wall thickness. The genetic correlations among these traits were all greater than 0.69 except the correlation between length and lumen diameter which was 0.42. Measurement of tracheid length can be used to assess family differences for cell diameter and cell wall thickness.None of the tracheid traits were strongly correlated with average disk density or the disk density of rings 3-5. Therefore, genetic selection for high average density in 10 to 12 year-old loblolly pines from the provenances studied here will not produce a predictable pattern in the character of outer-ring latewood tracheids.

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30

Shockey, Melissa Dawn. "Incorporating Climate Sensitivity for Southern Pine Species into the Forest Vegetation Simulator." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/22031.

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Growing concerns over the possible effects of greenhouse-gas-related global warming on North American forests have led to increasing calls to address climate change effects on forest vegetation in management and planning applications. The objectives of this project are to model contemporary conditions of soils and climate associated with the presence or absence and abundance of five southern pine species: shortleaf pine (Pinus echinata Mill.), slash pine (P. elliottii Engelm.), longleaf pine (P. palustris Mill.), pond pine (P. serótina Michx.), and loblolly pine (P. taeda L.). Classification and regression based Random Forest models were developed for presence-absence and abundance data, respectively. Model and diagnostics such as receiver operating curves (ROC) and variable importance plots were examined to assess model performance. Presence-absence classification models had out-of-bag error rates ranging from 6.32% to 16.06%, and areas under ROC curves ranging from 0.92-0.98. Regression models explained between 13.76% and 43.31% of variation in abundance values. Using the models based on contemporary data, predictions were made for the future years 2030, 2060, and 2090 using four different greenhouse gas emissions scenarios and three different general circulation models. Maps of future climate scenarios showed a range of potential changes in the geographic extent of the conditions consistent with current presence observations. Results of this work will be incorporated into eastern U.S. variants of the Forest Vegetation Simulator (FVS) model, similar to work that has been done for FVS variants in the West.
Master of Science

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31

Palombo, Caterina. "The influence of land-use and climatic changes on mountain pine (Pinus mugo Turra spp. mugo) ecotone dynamics at its southern range margin on the Majella massif, Central Apennines." Doctoral thesis, Università degli studi del Molise, 2013. http://hdl.handle.net/11695/66280.

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La mugheta del Parco Nazionale della Majella è una formazione isolata e relittuale, testimonianza vivente della possibile serie vegetazionale climacica della fascia subalpina in Appennino centrale. Il pino mugo cresce solitamente sopra il limite altitudinale degli alberi (timberline) e trova nel massiccio della Majella il limite meridionale del suo areale di distribuzione. Questa vegetazione ecotonale, di transizione tra il bosco denso di faggio e le praterie alpine, sensibile anche alle minime variazioni ambientali, rappresenta un ottimo indicatore degli effetti dei recenti cambiamenti climatici e di uso del suolo in atto nel Bacino del Mediterraneo. Le tendenze climatiche previste per quest’area includono un aumento delle temperature ed una diversa stagionalità delle precipitazioni, con aumento nei mesi invernali e diminuzione nei mesi estivi e autunnali. In Appennino, inoltre, la vegetazione arbustiva del piano subalpino è stata drasticamente ridotta in passato dall’azione diretta dell’uomo, per far spazio al pascolo d’alta quota. L’attuale e progressivo abbandono dei pascoli d’alta quota, però, sta permettendo una ricolonizzazione del piano alpino con la libera evoluzione delle serie vegetazionali. Questo lavoro ha l’obiettivo di valutare, mediante tre diversi approcci metodologici, gli effetti delle variazioni d'uso del suolo e dei cambiamenti climatici sulle dinamiche evolutive dei popolamenti di pino mugo nel massiccio della Majella. Un confronto diacronico svolto a scala di paesaggio, su fotogrammi aerei opportunamente ortorettificati e ortofoto digitali, ha mostrato una progressiva espansione della mugheta. Il contributo di indagini condotte in archivi di Stato e sedi ISTAT ha dimostrato una concomitante drastica riduzione della pratica del pascolo. Il ruolo delle variabili climatiche nella crescita del pino mugo è stato indagato mediante analisi dendroclimatologiche su carote legnose di pino mugo. Le relazioni clima-accrescimento sono state definite mediante funzioni di correlazione (CF), la cui variabilità nel tempo in risposta ai cambiamenti climatici è stata valutata con funzioni di correlazione a finestra mobile (MCF). I risultati hanno dimostrato che le variabili climatiche influenzano la crescita del pino mugo nell’ecotono della treeline sul massiccio della Majella. Significative CF sono state ottenute con le temperature massime primaverili e le precipitazioni estive. Le MCF hanno dimostrato che il pino mugo è una specie sensibile alle variazioni climatiche , in termini di crescita radiale, in particolare all'inizio e alla fine della stagione vegetativa. Il significato delle correlazioni ottenute è stato indagato con analisi anatomiche svolte a livello di singolo individuo che hanno permesso di definire le tempistiche della xilogenesi nel pino mugo. Le diverse fasi fenologiche (divisione e crescita cellulare, ispessimento della parete secondaria e completa lignificazione delle tracheidi) sono state monitorate durante un’intera stagione vegetativa, indagando contemporaneamente sulle tempistiche di formazione del legno di compressione (CW) e sulle differenze con il legno opposto (OW). Un maggior numero di cellule con parete secondaria più spessa è stato osservato nel CW, con tempi di formazione più lunghi rispetto al OW. Maggio rappresenta l’inizio della stagione vegetativa del pino mugo sul massiccio della Majella, settembre e ottobre la fine. Un incremento delle temperature primaverili permetterebbe un’anticipazione della riattivazione vegetativa e di conseguenza un allungamento della stagione di crescita del pino mugo. È quindi possibile confermare un’evoluzione della mugheta dovuta soprattutto all’abbandono dei pascoli, ma anche influenzata dagli andamenti climatici. Una eccessiva espansione della mugheta, principalmente verso quote maggiori, rappresenterebbe una minaccia per le specie rare ed endemiche presenti nei pascoli alpini del Parco Nazionale della Majella. Tuttavia, politiche di conservazione e salvaguardia dovranno allo stesso tempo evitare una eccessiva riduzione della mugheta e quindi la scomparsa dell’ultimo nucleo presente in Appennino.
Mountain pine krummholz within the Majella National Park forms an isolated patch and is a relictual species, thought representing the potential natural vegetation of the subalpine belt in Central Apennines, Italy. Mountain pine grows above the timberline and has in the Majella massif its southernmost limit of the distributional range. This vegetation dominates the treeline ecotone, between the dense beech forest and the alpine prairies, and is highly sensitive even to minor environmental changes. For this reason, it is a major proxy for monitoring the effects of climate and land-use changes occurring in the Mediterranean Basin. Mediterranean climatic trend includes projected increasing temperature and a different distribution of total precipitation, which are increasing during winter and decreasing during summer and autumn, respectively. Moreover, in Central Apennines, subalpine shrublands have been deeply reduced from the past anthropic practices. The recent abandonment of marginal areas and grazing cessation are allowing a re-colonization of areas previously grazed. The main objective of this study was to assess the effects of land-use and climatic changes on mountain pine population dynamics in the Majella massif, using three different methodological approaches. Temporal and spatial distribution of mountain pine since 1954 was reconstructed and a multitemporal map was created by historical aerial ortophotos. Results documented an upward and downward expansion of mountain pine and an ingrowth into the formerly tree-free grassland in early 1900s, together with a decline of the local human population and livestock. The relative role of climatic variables on mountain pine growth was assessed by dendroclimatological analysis. Climate-growth relationship were assessed by correlation function (CF) analysis and moving CF (MCF), investigating the possible deviations in the response of mountain pine to recent climate change. Results demonstrated that climate variables affected mountain pine growth at the treeline ecotone in the Majella massif. Significant correlations were found with the spring maximum temperatures and summer precipitation. MCF showed that mountain pine is a sensitive species, in terms of tree ring growth, particularly at the beginning and at the end of the growing season. For better understand dendroclimatological results, wood anatomical analyses were conducted. Timings of mountain pine xylogenesis were assessed and the principal phenological phases (cambial division; enlargement; wall thickening; mature) were monitored during the entire growing season. At the same time timings of compression wood (CW) formation and possible differences with the opposite wood (OW) formation were investigated. Results indicated that CW is characterized by higher number of cells and thicker secondary wall, as well as longer xylogenesis compared with the OW. The growing season started simultaneously in both types of wood (on 20 May), and ended two week earlier in OW (on 22 September) than in CW (on 6 October). Increasing temperature of spring month would be favourable for the elongation of mountain pine growing season, which would probably start early, though decreasing precipitation could compromise wood formation during summer, mountain pine being highly sensitive to this climatic parameter. Growing above the limit of tree vegetation, mountain pine proved to be a promising species for monitoring climate- and land use-driven influences over tree-ring growth at high elevation. An excessive expansion of mountain pine krummholz, mainly at higher altitudes, may represent a threat for rare and endemic species growing in the alpine grasslands of the Majella National Park. However, conservation and preservation of mountain pine are required, in order to avoid a severe reduction of its distribution and then the risk of extinction of the last “island” present in the Apennine.

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32

Moan, Jason Edward. "Development and assessment of remotely derived variables in current southern pine beetle (Dendroctonus frontalis Zimm.) hazard mapping in North Carolina, USA." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/34618.

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The southern pine beetle (SPB) (Dendroctonus frontalis Zimm.) is one of the most destructive forest insect pests in the southeastern United States and has historically had a large impact on the forests of North Carolina. Many characteristics of a forest can contribute to SPB susceptibility including stand density, growth rate, age, soil type, and position on the landscape. This work was undertaken in an effort to assist and improve on the current federal SPB hazard modeling being conducted for North Carolina by the USDA Forest Service â Forest Health Protectionâ s Forest Health Technology Enterprise Team (FHTET). In our study, predictive SPB susceptibility models were developed for each physiographic region in North Carolina using two variables not currently included in the FHTET modeling, mean stand age and the in-stand percentage of sawtimber-sized pines. These variables were obtained from USDA Forest Service â Forest Inventory and Analysis (FIA) data and North Carolina Forest Service historical SPB records creating a dataset of both infested and non-infested stands and the models were developed using the CARTÂ® classification tree approach. Two model-derived age classes (older than and younger than 22 years) were identified on the landscape using current Landsat 5 Thematic Mapper (TM) imagery chronosequences of disturbance index (DI) â transformed scenes to identify stand-replacing disturbances, resulting in a kappa statistic of 0.6364 for the younger than 22 year age class and 0.7778 for the older than 22 years age class. A kappa value of 1 is ideal. The CARTÂ® modeling effort produced valid models in all three physiographic regions of North Carolina, though the complexity of the piedmont model makes it impractical for use in the field. The dependent variable in the classification tree was presence or absence of SPB outbreak and the test sample error percentages were similar across regions, with errors ranging between 23.76 - 34.95 percent. Overall prediction success, based on the softwareâ s internal cross-validation procedure, was likewise comparable across the regions with 72.28 - 89.56 percent correctly predicted. Based on our modeling, stand age and percent sawtimber should be included in future FHTET SPB hazard modeling efforts for the coastal plain and mountains, respectively. Age classes can be reasonably estimated using Landsat or other multispectral imagery.
Master of Science

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33

Yadama, Vikram. "Experimental investigation of a novel finite element model for Southern pine glulam beams." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-12302008-063816/.

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34

Karki, Uma Goodman Mary Schmitt. "Southern-pine silvopasture systems forage characteristics, soil quality, and landscape utilization by cattle /." Auburn, Ala, 2008. http://hdl.handle.net/10415/1409.

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35

Grosman, Donald Michael. "Southern pine beetle, Dendroctonus frontalis Zimmermann (Coleoptera: Scolytidae) : quantitative analysis of chiral semiochemicals /." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-05042006-164540/.

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36

McManis, Anne Elise. "Phenology of a Southern Population of Mountain Pine Beetle (Dendroctonus ponderosae)." DigitalCommons@USU, 2018. https://digitalcommons.usu.edu/etd/7006.

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Mountain pine beetle (Dendroctonus ponderosae, Hopkins) is a major disturbance agent in pine ecosystems of western North America. Adaptation to local climates has resulted in primarily univoltine (one generation per year) generation timing across a thermally diverse latitudinal gradient. We hypothesized that this pattern in total development time is shaped by selection for slower developmental rates, altered developmental thresholds, or oviposition rates in southern populations inhabiting warmer climates. To investigate traits responsible for latitudinal differences we measured lifestage-specific development of southern mountain pine beetle eggs, larvae and pupae across a range of temperatures. We also describe and model oviposition of southern US MPB. Using a novel technique that included frequent X-ray imaging, oviposition rate and fecundity were estimated separately and shown to both be significant and independent sources of variation. When compared with previously collected data for a northern MPB population, total oviposition time predicted for southern MPB at a constant 20°C was slightly longer than that of northern MPB, but the delay was too small to account for significant differences between the populations in total development time. Developmental rate curves for eggs, larvae, and pupae were fit using maximum posterior likelihood estimation with a Bayesian prior to improve fit stability. When compared to previously published data for a northern population (Régnière et al. 2012), observed developmental rates of the southern and northern populations were similar across all studied lifestages at 20 and 25°C, although southern individuals were generally faster at temperature extremes (10 and 27°C). These findings were inconsistent with our hypothesis that southern individuals would have consistently slower rates. Optimal development of southern individuals occurred at higher temperatures, with higher development thresholds, as compared with northern individuals. Our results suggest that evolved traits in the remaining unstudied lifestage, teneral (i.e., pre-emergent) adult, likely influence latitudinal differences in mountain pine beetle generation time.

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37

Dahlen, Joseph. "REDUCTION OF VOLATILE ORGANIC COMPOUNDS EMITTED DURING KILN DRYING OF SOUTHERN YELLOW PINE LUMBER." MSSTATE, 2008. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10172008-085347/.

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The objective of the research is to reduce the volatile organic compounds (VOCs) emitted during kiln drying of southern yellow pine (SYP) lumber. Three treatment methods were explored to determine their effect on VOC emissions. The three methods were configured at the air exhaust of a pilot-scale dry kiln. 1) A steel reactor containing copper tubing heated to 100°, 200°, and 240° Celsius was evaluated. Temperature did not statistically affect VOC emissions (p-value = 0.1674). The average reduction of VOCs at 240° C was seven percent. 2) The use of hydrogen peroxide and ultra-violet (UV) light did not reduce VOCs emitted during kiln drying. 3) The use of Fenton?s reagent, with hydrogen peroxide and ferrous sulfate, also did not reduce VOCs emitted during kiln drying. 4) It is recommended that future studies with copper heated to temperatures above 240° C be performed.

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38

Thompson, Peter L. "Southern pine workers and the rise of capital in the New South, 1865-1900." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244231.

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39

Liswell, Brian P. "Exploration of Wood DCB Specimens Using Southern Yellow Pine for Monotonic and Cyclic Loading." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9955.

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The primary direction of this thesis was towards exploring qualitative and quantitative characteristics necessary for refining and understanding the flat wood double cantilever beam (DCB) as a valid means for testing Mode I fracture energy in wood adhesive bonds. Southern yellow pine (SYP) adherends were used with epoxy and phenol formaldehyde (PF) impregnated films, providing two systems with different characteristics for investigation. An adhesive penetration analysis was performed for both the epoxy and PF bonds. The PF penetration into the SYP was shown to be relatively shallow. The epoxy penetration was shown to be deeper. Epoxy-SYP DCBs were quasi-statically tested with varying widths (10 mm, 15 mm, and 20 mm), showing decreases in scatter of critical and arrest strain energy release rates, GIc and GIa, with increases in specimen width. Quasi-static fracture testing was also performed on PF SYP-DCBs, showing much higher critical and arrest fracture energy values than the epoxy-SYP DCBs, indicating that deep adhesive penetration is not necessarily a requisite for higher Mode I fracture energy values. Grain distribution influences were computationally investigated because of the stiffness difference between latewood and earlywood growth and the grain angle along the length of the beams. The grain angle and the stiffness difference between latewood and earlywood growth caused the effective stiffness, (ExxI)eff, to vary along the length of the beam. The effective stiffness variation caused variations in the beam's ability to receive and store strain energy, complicating and confounding determination of experimental results. Cyclic loading tests were performed on PF-SYP DCB's. The cycle frequency was 3Hz, with a valley to peak load ratio of R = 0.5. Specimen softening was observed with cycling, with re-stiffening occurring with crack growth. Contrary to expectations, specimen compliance occasionally decreased with small crack extensions. A toughening mechanism was frequently observed, whereby subsequent crack lengths required more cycles to failure than the previous crack length. Monotonically extending the crack length far from the fatigued region created a fresh crack that did not show the toughened behavior. But toughening did resume with subsequent crack lengths.
Master of Science

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40

Fredericksen, Todd Simon. "Interference interactions in experimental pine-hardwood stands." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-134718/.

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41

Van, Zyl Salmon Johannes. "Biomass potential and nutrient export of mature pinus radiata in the southern Cape region of South Africa." Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/4321.

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South Africa lags behind the rest of the world with regard to the availability of allometric biomass information. There is a complete lack of site specific allometric data for Pinus radiata in the southern Cape region, impeding investment in the renewable energy sector. This shortcoming was addressed by developing up-scalable, single tree biomass models. These models quantify the aboveground biomass of rotation age P. radiata grown in the southern Cape across a range of site conditions. The models use diameter at breast height (DBH) to predict the aboveground component biomass. A nutrient loss risk potential was assigned to each biomass component. Nineteen trees were destructively harvested using a full fresh weight sampling approach. Basic density was determined using a water displacement method, while Newton’s volume equation was used for stemwood volume determination. Log linear models were simultaneously regressed through seemingly unrelated regression (SUR) using the “Systemfit” R statistical package to force component additivity. A categorical variable was applied to the models, grouping the data into two Site Index (SI) based categories, namely “Low” SI and “Medium to High” SI, to account for inter-site variability. The corrected Akaike Information Criteria (AICc) and coefficient of determination (R2) was used to determine the goodness of fit of the models. The McElroy R2 for the SUR system was 0.95. Biomass models were developed that are able to predict various tree component masses at high levels of certainty within site and stand attribute ranges similar to this study. The importance of accurate, site specific wood basic density was demonstrated by its substantial weighting on stem and hence total biomass. Results showed that the stemwood mean basic density range was between 503 kg m-3 and 517 kg m-3 for the “Low” SI sites and 458 kg m-3 for the “Medium to High” SI sites. Site quality can have a major impact on the models, particularly on poorer sites where stemwood production is proportionally less than other tree components. Total aboveground biomass was estimated to range between 58.61 odt ha-1 and 70.85 odt ha-1 for “Low” SI sites, and 185.31 odt ha-1 to 266.58 odt ha-1 for “Medium to High” SI sites. Stemwood biomass accounted for 65% of the total aboveground biomass for “Low” SI sites and 70% for “Medium to High” SI sites.

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42

Lyons, Donald Barry. "Phenology and biometeorology of pine false webworm (Hymenoptera: Pamphiliidae) and its parasitoids in southern Ontario." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29016.

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Models of phenology of the pine false webworm (PFW), Acantholyda erythrocephala and one of its parasitoids were developed from relationships between PFW spatial distribution and microweather. Development of subterranean stages of PFW was simulated from rate-summation models developed from nonlinear regression equations describing the relationship between temperature and rate of development of post-diapause prepupae and pupae. Defoliation caused by PFW increased the soil's exposure to solar radiation resulting in higher soil temperatures and a corresponding reduction in development time of subterranean stages. Predictability was enhanced slightly when the distribution of insects and temperature of the soil were incorporated into the model. Increasing the time increment used in the model from 1 to 4 h did not adversely affect its resolution. Mating and oviposition of PFW occur within a few hours of emerging from the soil and the majority of PFW eggs were mature and ready for deposition at female emergence. Potential fecundity of PFW was accurately predicted from adult wet and dry weights. The oviposition pattern of PFW was also described by a model based on temperature-dependent oviposition and ageing rate functions. The effect of larval web construction on the development of arboreal stages was investigated. When exposed to sunlight, the web traps heat and raises the body temperature of its inhabitants. A model was developed and used to examine the significance of the web microclimate for development of larvae. Relationships between web temperatures, canopy temperatures and standard meteorological methods were developed to permit using data from standard weather stations to drive the model. Larval development increased by 1.4 to 2.8 d when estimated web temperatures were incorporated into the model, while development was retarded by 2.6 to 4.0 d when canopy temperatures were used instead of meteorological screen temperatures. Two ichneumonid parasitoids, Sinophorus megalodontis and an undescribed species of Olesicampe were reared from eonymphs of PFW. Morphological methods for distinguishing the immature stages of the parasitoids were developed. A predictive model for subterranean development and adult longevity of Olesicampe sp. was used to describe and to compare phenological observations from emergence traps, Malaise traps and dissections of host larvae. The effectiveness of the parasitoids as natural control agents is discussed in relation to host synchrony, encapsulation, and multi- and superparasitism.
Land and Food Systems, Faculty of
Graduate

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43

De, Baun Derik K. "Silica Replacement in the Southern White Pine Range, East Central Nevada| A Stable Isotope Study." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10841608.

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In the southern White Pine Range (SWPR) silica is found to have been deposited from hydrothermal solution within the Currant Gap Detachment fault (CGD). Silica has been observed to occur in three modes of deposition: (1) narrow veins within the lower plate Pole Canyon limestone, (2) bulk silicification of carbonates and (3) breccia matrix found in proximity to the CGD.

Through stable isotope analysis of oxygen from quartz samples and hydrogen from fluid inclusions we see that there is a history of meteoric waters penetrating into the Lower Pole Canyon Formation, in the lower plate of the CGD. This study reveals that silica in the SWPR formed from aqueous fluids at temperatures between 260 °C and 315 °C within lower plate quartz veins and 150 °C to 300 °C within the upper plate of the CGD. These temperature ranges are in line with what would be expected in a brittle regime (T < 350 °C).

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44

Öberg, Lisa. "Treeline dynamics in short and long term perspectives : observational and historical evidence from the southern Swedish Scandes." Doctoral thesis, Mittuniversitetet, Avdelningen för naturvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-18458.

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Treelines in high-mountain regions are constrained by heat deficiency, although the working mechanisms are still not entirely understood. Observational and paleoecological studies on treeline performance may contribute to increased understanding of the treeline phenomenon in general. The present thesis addresses elevational shifts of alpine treelines in the Swedish Scandes. By various analytical tools, the studies embrace widely different temporal scales. The concept treeline refers to the elevation (m a.s.l.) at a specific site of the upper individual tree of a certain tree species, at least 2 m tall. All the principal tree species in the Scandes are concerned, i.e. mountain birch (Betula pubescens ssp. czerepanovii), Norway spruce (Picea abies) and Scots pine (Pinus sylvestris). Paper I deals with regional treeline dynamics at more than 100 sites over the past 100 years. Concurrent with temperature rise by c. 1.4 °C over the same period, maximum treeline advances of all species amount to about 200 m. Thus, under ideal conditions, treelines respond in close equilibrium with air temperature evolution. However, over most parts of the landscape, treeline upshifts have been much smaller than 200 m, which relates to the combined action of geomorphology, wind, snow distribution and soil depth. After 1975, the birch has lost its role as the most rapidly advancing tree species, being superseded by pine and spruce. Paper II is a short-term (2005/2007-2010/2011) study of mountain birch treeline performance along a regional maritimity-continentality gradient. Upshift by 3.0 yr-1 in the maritime part of the gradient contrasts to retreat by 0.4 m yr-1 in the continental part. In the latter area, earlier and more complete melting of late-lying snow patches has seemingly progressed to a state when soil drought sets back the vigour of existing birches and precludes sexual regeneration and upslope advance of the treeline. In the maritime area, extensive and deep snow packs still exist above the treeline and constrain its position, although some release is taking place in the current warm climate. Paper III explores treeline change by phenotypic transformation of old-established stunted and prostrate spruce individuals (krummholz) growing high above the treeline and is based on analyses of radiocarbon-dated megafossils, preserved in the soil underneath clonal groups of spruce. Living spruce clones, which in some cases may date back to the early Holocene (9500 cal. yr BP), suggests that spruce immigrated from “cryptic” ice age refugia much closer to Scandinavia than conventionally thought. As the krummholz form presupposes open and windy habitats, it is inferred that permanently open spots prevailed in the high-mountain landscape even during periods when treelines in general were much higher than today. Paper IV reports radiocarbon dates of wood samples, retrieved from newly exposed glacier forefields at three main sites, located high above the modern treelines and embracing the entire Swedish Scandes. It appears that pine colonized early emerging nunataks already during the Late Glacial. Around 9600-9500 cal. yr BP a first massive wave of tree establishment, birch and pine, took place in “empty” glacier cirques. Both species grew 400-600 m above their present day treeline position and accordingly, the summer temperatures may have been 3.5 °C warmer than present (uncorrected for land uplift). During the entire interval 9600 to 4400 cal. yr BP, birch prospered 100-150 m above the uppermost pines. In response to Neoglacial cooling, treelines of both birch and pine descended until their final disappearance from the record 4400 and 5900 cal. yr BP, respectively. Thereafter, these habitats experienced increased snow accumulation and glacier inception.
Avhandlingen belyser förskjutningar i olika tidsskalor av den alpina trädgränsens läge i de svenska Skanderna. Trädgränsen definieras som den högsta nivån (m ö.h.) för minst 2 m höga individer av en viss art i en definierad del av en fjällsluttning. Avhandlingen består av fyra separata uppsatser, publicerade i olika välrenommerade vetenskapliga tidskrifter. I Paper I analyseras förändringar av trädgränserna för fjällens vanligaste trädarter, fjällbjörk, gran och tall (Betula pubescens ssp. czerepanovii, Picea abies och Pinus sylvestris) mellan 1915 och 2007. Undersökningen omfattar ett 8000 km2 stort, naturgeografiskt heterogent område, med mer än 100 lokaler. De maximala trädgränsförskjutningarna för samtliga trädarter uppgår till omkring 200 m. Resultaten motsvarar de trädgränsförskjutningar som teoretiskt kan förutsägas utifrån den temperaturhöjning med cirka 1,4 °C som skett under samma tidsperiod, förutsatt ideala förhållanden. För större delen av området råder emellertid andra, icke-ideala förhållanden, varför trädgränsernas uppflyttning i allmänhet blivit avsevärt mindre än 200 m. Den främsta anledningen till detta är lokala topoklimatiska begränsningar, d.v.s. kombinerade effekter av geomorfologi, vind, snöfördelning, jorddjup, etc., som i stora delar av det starkt brutna fjällandskapet mer eller mindre effektivt hindrar träden från att nå sina potentiellt högst belägna växtplatser betingade av temperaturen. Efter 1975 har björken förlorat sin roll som arten med den snabbast expanderande trädgränsen. I stället har tall och gran avancerat med större hastighet. Det innebär att även om klimatets uppvärmning fortsätter, så kommer det subalpina björkbältet att expandera i avsevärt mindre omfattning än vad som ofta förebådats. Möjligtvis kommer det att ersättas av tall. Paper II behandlar björkens trädgränsdynamik under perioden 2005/2007-2010/2011 längs en regional klimatgradient med avseende på maritimitet/kontientalitet. Trädgränsen har under den aktuella perioden avancerat 3,0 m/år i den maritimt präglade delen av gradienten, vilket kontrasterar signifikant mot en sänkning med 0,4 m/år i området med mer kontinentalt klimat. Skillnaderna diskuteras i termer av klimatförändringens varierande effekter på snötäckets utbredning och varaktighet och dess inverkan på markfuktigheten. En allt tidigare total utsmältning av snölegorna i de kontinentala områdena har av allt att döma resulterat i vattenbrist under sommaren. Torka medför reducerad vitalitet för existerande björkar och förhindrar både sexuell förökning och uppflyttning av trädgränsen. I de maritima delarna kvarligger alltjämt mycket snö under en stor del av sommaren. Trädgränsens position har därför kunnat bibehållas eller flyttas upp. Vissa omständigheter tyder på att trädgränsens stigning i högre grad har varit baserad på fröföryngring efter 1975, jämfört med perioden 1915-1975. Utgångspunkten för Paper III är erfarenheter från Paper I, som visar att trädgränsens uppflyttning för gran och björk huvudsakligen är resultatet av ökad höjdtillväxt av äldre, i vissa fall flertusenåriga, mer eller mindre buskformiga individer (krummholz), som vuxit på nivåer långt ovanför trädgränsen. Som ett svar på de senaste hundra årens varmare klimat har dessa antagit trädform, varigenom trädgränsen höjts. För en fördjupad förståelse av den här mekanismen har megafossil, d.v.s. grova vedrester bevarade i marken under gamla grankloner i trädgränsekotonen, 14C-daterats. Resultaten tyder på att granar i exponerad fjällmiljö kan uppnå i det närmaste ”evigt” liv genom sin förmåga till vegetativ förökning och möjligheten att växla mellan busk- och trädform i takt med klimatets växlingar. Vissa nu levande kloner existerade av allt att döma redan för 9500 år sedan. Den nu dokumenterat tidiga förekomsten av gran, bekräftar den på senare tid allt tydligare bilden av granen som en tidig invandrare till fjällkedjan. Möjligtvis har granen ”övervintrat” den senaste istiden närmare Skandinavien än vad som till helt nyligen varit den gängse uppfattningen. Paper IV behandlar en för Skandinavien ny metod för historisk trädgränsrekonstruktion. I uppsatsen analyseras 14C-dateringar av totalt 78 större veddelar (megafossil) som nyligen exponerats i anslutning till smältande glaciäris och ”perenna” snölegor i tre huvudområden, Helags-Sylarna, Tärna och Abisko, högt ovanför dagens trädgräns. Det framkommer att tall (Pinus sylvestris) koloniserade tidigt framsmälta nunatakker redan under senglacial tid. För omkring 9600-9500 år sedan inträffade en första massiv våg av björk- och talletablering i isfria glaciärnischer. Båda arterna växte 400-600 m ovanför sina nuvarande trädgränspositioner, i ett klimat som kan ha varit 3,5 °C varmare än idag. Under intervallet 9600 till 4400 BP uppträdde björken i ett 100-150 m brett bälte ovanför de översta tallarna. Som ett svar på klimatets successiva avkylning under senare delen av Holocen sänktes både björkens och tallens trädgränser i de aktuella miljöerna, till dess de för 4400 respektive 5900 år sedan helt försvann från lokaler där glaciärer och perenna snöfält började bildas. De analyserade trädresterna, som länge bevarats av glaciäris och perenn snö representerar en period med ett klimat långt varmare än under det senaste århundradet. Med denna analogi från det förflutna kan det därför antas att i en framtid där sommartemperaturerna rent hypotetiskt är 3,5 °C högre än i nutiden, skulle trädgränserna lokalt kunna flyttas upp med ungefär 600 m.

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45

Thomson, Roberto F. "Response of temperate forest birds to habitat change in central Chile." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:1792418e-18e9-4344-96ce-3bad2aa03500.

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Despite the long time since the introduction and spread of pine plantations in southern hemisphere countries there has been no study of the suitability of this exotic and novel type of vegetation on the native avifauna. This thesis aims to add understanding of this habitat replacement and its effects on the forest bird community. This research included a series of studies to assess the quality of mature pine plantations for the forest avifauna in comparison to what is in native forests. The first two studies determine the effects on the forest bird community of the fragmentation and replacement of native forest in a gradient of substitution. The results showed a direct relationship between level of substitution and loss of functional diversity, and that fragmentation predicts the bird assemblage in pine stands. The next two studies used data from an intensive ringing season to assess differences in the condition of populations inhabiting each habitat. Birds, in general, were found in better condition in native fragments than in pine plantations. Moreover, a despotic distribution was determined for a migrant species and a gradient in habitat quality was found in relation to proximity to native forest. The next two studies used information from a nest-box survey set in a gradient of sites with substitution of native forest. The results showed that the type of forest cover and their proportion in the landscape may affect the breeding performance of some species. Finally, in the last study I evaluated the foraging niche of bird species in each habitat. Compared with native forest, niche breath reduced while the niche overlap increased in pine plantations for most species. The results suggest that pine plantations are poor quality habitat for the bird community and that the substitution of native forests increases selective pressure.

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Dunn, Natalie Kirsty. "Petrogenesis of hybrid porphyry pipes and evolution of alkaline magmas in the Kanabeam Igneous Complex, Southern Namibia." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/4195.

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Includes bibliography.
The linear Kuboos Bremen Igneous Province (KBIP) stretches 270km from the South African Atlantic coast north-eastwards into southern Namibia, and was emplaced at approximately 500Ma. One central complex within the KBIP is the Kanabeam Igneous Complex (KIC) where practically all the rock types found in the province are represented and include nepheline syenites, quartz syenites as well as granites. In addition to these plutonic phases a number of late stage, xenolith rich porphyry pipes were emplaced, exploiting contact zones between earlier plutons. Xenolith types include gabbro possibly derived from unexposed deeper parts of the KIC, syenites (more proximal components of the KIC), trachytes from an inferred overlying volcanic edifice, basement granites, gneisses and metasediments as well as Nama Group sediments. Petrographicl examination in the porphyries has releaved that there are numerous minerals out of textual equilibrium, including olivine, pyroxene and plagioclase. Other minerals such as biotite, amphibole and alkali feldspar appear more stable.

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Ryall, Krista Lee. "Biology of the recently introduced pine shoot beetle Tomicus piniperda (L.) (Coleoptera, scolytidae) in Southern Ontario." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0010/MQ29358.pdf.

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Cui, Yu. "Delignification of Kraft-AQ Southern Pine Pulp with Hydrogen Peroxide Catalyzed by Mn(IV)2-Me4DTNE." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000203-202106.

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Over the years, hydrogen peroxide has been used to improve the brightness of pulp at the end of a bleaching sequence. However, the degree of delignification achieved by a hydrogen peroxide stage is usually modest. That is because in alkaline condition the hydroperoxy anion reacts with chromophores in pulp as a nucleophile that does not oxidize residual lignin to a significant extent. In order to enhance the reactivity of hydrogen peroxide as an oxidant, a binuclear manganese complex Mn(IV)2-Me4DTNE was added. As a result, the degree of delignification was significantly improved, while at the same time, the strength properties of the pulp were better preserved compared traditional in hydrogen peroxide delignification. In order to better understand the mechanism of this delignification process, lignin model compound oxidation and kinetics of pulp delignification were studied. In addition, residual lignin was isolated from the pulp before and after delignification and then characterized by GPC, FTIR, and 1H-13C 2D NMR. Shown by the model compound study, hydrogen peroxide is able to oxidize 1-(3,4-dimethoxyphenyl)ethanol, E-diphenylethene, and 1-(3,4-dimethoxyphenyl)-1-propene to a considerable extent when catalyzed by Mn(IV)2-Me4DTNE, indicating that the reactivity of hydrogen peroxide as an oxidant is significantly improved. Indeed, as shown by the kinetic study of pulp delignification, the degree of delignification as well as the rate of delignification were greatly improved when the catalyst was applied. In addition, the catalyzed delignification process benefits from the concerted reaction mechanism that regulates the formation of hydroxyl radicals responsible for the severe damage to the fibers. As a result, the strength properties were well preserved. Shown by the characterization of residual lignin before and after the delignification, residual lignin was oxidized to a good extent which accounts for the significant degree of delignification. The process simulation of this catalyzed delignification process by WinGEMS4.0 showed that this process was profitable if the cost of the catalyst was kept below $330/kg.

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Hailu, Solomon Ghebremeskel. "THE EFFECT OF HABITAT FRAGMENTATION ON THE SPATIAL POPULATION GENETIC STRUCTURE OF SOUTHERN PINE BEETLE (DENDROCTONUS FRONTALIS)." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/624.

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Southern pine beetle (SPB), Dendroctonus frontalis (Zimmerman), is one of the most destructive insect pests of pine trees in southern United States, Mexico and Central America. There is relatively little information on the effect of habitat fragmentation on the connectivity and the spatial population genetics of SPB. This study therefore, adds to previously generated information by assessing how habitat fragmentation affects the spatial population genetic structure of SPB. It also introduces a new approach to the study of bark beetle population dynamics by assessing how landscape variables shape their effective dispersal. To address this issue, a suite of eight highly polymorphic DNA microsatellite markers were used to measure SPB movement over a representative range of SPB habitat and non-habitat (matrix). At the broadest scale, highly significant genetic differentiation suggests that the sampled populations are not panmictic. Loci with higher variability yielded higher resolution for both the infinite allele model based measure of differentiation (FST) and the stepwise mutation based measure (RST) estimates. It is apparent that allelic frequency differences, allelic size ranges and repeat motif played a role in the observed patterns of pair-wise differentiations between the sampled localities. It is supposed that gene flow, wide-range dispersal and recent divergent time could have contributed to the lower level of genetic structure observed in the pair wise estimates. The sampled populations did not show any differentiation attributable to the host species from which they were collected. Mantel test of genetic distance and Euclidean geographic distance revealed no correlation. Mantel tests of the correlation between genetic distance and cost weighted Euclidean distances also suggest that dispersal of SPB across geographic barriers is not significantly reduced. Thus, landscape features and host preference do not appear to have had an impact on population genetic structure of SPB. Since movements of these beetles were not significantly hindered by environmental factors like major rivers, roads, elevation and host type, it is advisable for regional pest management offices to put an effort and coordinate their prevention and management plans in a broader scale to alleviate the problem associated with this native insect pest. Disequilibrium in the observed homogenized pattern of the beetle in this study suggests human contribution in the dispersal of SPB. Therefore, stringent control is deemed necessary in transportation of logs. This could improve our pest management system hence its positive implication in timber industry is obvious.

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Watson, Adam. "Cost share payment and willingness to participate in Virginia's Pine Bark Beetle Prevention Program." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32876.

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Forest management practices which reduce southern pine beetle (SPB) risk benefit not only the landowners who perform them, but all those who draw benefits from southern pine forests in Virginia, especially other forest owners within the same region. One such management practice is pre-commercial thinning (PCT), which is particularly unattractive to non-industrial private forest (NIPF) landowners because of the substantial costs and delayed financial returns involved. Since the benefits to society generated by PCT are not fully realized by the individuals who might implement it, there may be a market externality in which PCT is underprovided across the landscape. The Pine Bark Beetle Prevention Program (PBBPP) has the potential to correct this externality by reimbursing a portion of the costs of PCT for landowners who qualify. However, cost share incentives have been criticized for being ineffectual on the basis that landowners substitute publicly funded reimbursement for private investment, without altering their management practices. To investigate the effect of the PBBPP cost share for PCT, a survey was sent to 1,200 NIPF landowners in seven counties across the Piedmont and Coastal Plain physiographic regions of Virginia, where southern pine is prevalent and SPB hazard is a relevant concern. To measure willingness to participate in the program, a referendum style question was used in which the offered cost share ranged from 20% to 90%. Results of discrete choice models estimated from survey data indicate that cost sharing has a significant, positive effect on willingness to participate overall, though increasing reimbursement above 60% is unlikely to affect participation. Some landowners are not responsive or are less responsive to cost sharing due to personal and property characteristics.
Master of Science

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Dissertations / Theses on the topic 'Southern pines'

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