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Artículos de revistas sobre el tema "Pinus ponderosa"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 31 de enero de 2023

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1

Willyard, Ann, David S. Gernandt, Blake Cooper, et al. "Phylogenomics in the Hard Pines (Pinus subsection Ponderosae; Pinaceae) Confirms Paraphyly in Pinus ponderosa, and Places Pinus jeffreyi with the California Big Cone Pines." Systematic Botany 46, no. 3 (2021): 538–61. http://dx.doi.org/10.1600/036364421x16312067913435.

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Abstract— We sampled 130 individuals (2 to 25 per taxon) of Pinus subsections Ponderosae and Sabinianae. Nucleotide sequences were obtained by targeting 703 low copy nuclear genes. From the unenriched portion of the short reads, we assembled nearly complete plastome nucleotide sequences. We used 600 nuclear genes and the plastome sequences to create phylogenies and species trees that we compared to evaluate cytonuclear concordance and reticulation. We found that Pinus jeffreyi belongs with Pinus subsect. Sabinianae based on morphological synapomorphies as well as strong molecular phylogenetic

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2

Rappaport, Nancy Gillette, John D. Stein, Adolfo Arturo del Rio Mora, Gary DeBarr, Peter de Groot, and Sylvia Mori. "RESPONSES OF CONOPHTHORUS SPP. (COLEOPTERA: SCOLYTIDAE) TO BEHAVIORAL CHEMICALS IN FIELD TRIALS: A TRANSCONTINENTAL PERSPECTIVE." Canadian Entomologist 132, no. 6 (2000): 925–37. http://dx.doi.org/10.4039/ent132925-6.

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AbstractWe tested six behavioral chemicals, pityol, conophthorin, 4-allylanisole, verbenone, 2-hexenol, and α-pinene, in a series of field trials directed at six combinations of Conophthorus Hopkins – Pinus L. spp. (Pinaceae) in sites distributed across North America. Beetle – host tree combinations included Conophthorus ponderosae Hopkins on Pinus ponderosa Laws., C. ponderosae on Pinus monticola Dougl., Conophthorus conicolens Wood on Pinus pseudostrobus Lindl., Conophthorus teocotum Wood on Pinus teocote Schl. & Cham., Conophthorus coniperda (Schwarz) on Pinus strobus L., and Conophthor

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3

Filip, Gregory M., Helen Maffei, and Kristen L. Chadwick. "Forest Health Decline in a Central Oregon Mixed-Conifer Forest Revisited After Wildfire: A 25-Year Case Study." Western Journal of Applied Forestry 22, no. 4 (2007): 278–84. http://dx.doi.org/10.1093/wjaf/22.4.278.

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Abstract A 500-ac mixed-conifer forest near Cache Mountain in central Oregon was examined in 1979, 1992, 2002, 2004, and 2005 to document causes of forest health decline and subsequent wildfire damage. The site is dominated by grand fir (Abies grandis) and ponderosa pine (Pinus ponderosa), with some lodgepole pine (Pinus contorta) and subalpine fir (Abies lasiocarpa). Part of the area was clearcut or shelterwood harvested from 1983 to 1985. Between 1979 and 1992, grand fir increased substantially, whereas ponderosa pine decreased in stems and basal area/ac in the unharvested areas. From 1979 t

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4

Shirley, Brian M., and Stephen Cook. "Repellency and Toxicity of Conophthorus ponderosae Hopkins (Coleoptera: Scolytidae) by the Host Monoterpene Myrcene." Western Journal of Applied Forestry 22, no. 4 (2007): 241–47. http://dx.doi.org/10.1093/wjaf/22.4.241.

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Abstract Seed orchards produce high-quality seed from selected tree genotypes. In the intermountain west, Conophthorus ponderosae Hopkins (Coleoptera: Scolytidae) is a pest in seed orchards of ponderosa pine, Pinus ponderosa (Laws). The effect of myrcene as a deterrent to coneattack by C. ponderosae in a ponderosa pine seed orchard was examined. Two factors were considered, timing of cone cluster attack and average brood production per cone cluster. There was a delayed attack by C. ponderosae on cones treated with vials of myrcene attached at thebase of cone clusters. During both 2003 and 2004

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5

Wallace, John M., Timothy S. Prather, and Vanelle Peterson. "Effects of Aminopyralid on Ponderosa Pine (Pinus ponderosa)." Invasive Plant Science and Management 5, no. 2 (2012): 164–69. http://dx.doi.org/10.1614/ipsm-d-11-00052.1.

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AbstractInvasive weed control within cleared, forested sites in the inland Northwest is complicated by the susceptibility of ponderosa pine to synthetic auxin herbicide injury, used to control broadleaf weeds. Herbicide injury may lead to decreased canopy volume and variable growth patterns of ponderosa pine, which is a commercially important tree species. Herbicide injury to ponderosa pine can be decreased with dormant-season applications, a timing suited to control many weeds that may occur within ponderosa pine sites. However, spring-timed herbicide applications are needed to control other

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6

Widmer, Timothy L., and Stephen C. Dodge. "Infection of Select Pinaceae and Cupressaceae Seedlings to Phytophthora pinifolia." Plant Health Progress 20, no. 2 (2019): 106–11. http://dx.doi.org/10.1094/php-02-19-0011-rs.

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Phytophthora pinifolia caused a devastating disease on Monterey pine (Pinus radiata) in Chile. This pathogen has not been reported in the United States, but there is concern should it arrive. There is little information regarding other hosts besides Monterey pine that may be susceptible to this pathogen. In the present study, other potential hosts within the Pinaceae and Cupressaceae were inoculated with zoospores of P. pinifolia and observed for symptoms and infection after 4 weeks. Similar to Monterey pine, knobcone (Pinus attenuata), bishop (P. muricata), and ponderosa (P. ponderosa) pines

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7

Rudloff, Ernst von, and Martin S. Lapp. "Chemosystematic studies in the genus Pinus. VII. The leaf oil terpene composition of ponderosa pine, Pinus ponderosa." Canadian Journal of Botany 70, no. 2 (1992): 374–78. http://dx.doi.org/10.1139/b92-050.

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The leaf oil terpene composition of ponderosa pines (Pinus ponderosa Laws.) from 37 sites west of the Continental Divide north of 42°, 5 sites east of the Divide in Montana, and 1 each from the Black Hills, South Dakota, Wilkerson Pass, Colorado, and Grand Canyon, Arizona was determined. Tree-to-tree variation was quite low, as was between-population variability at all northwestern locations. Quantitative and qualitative differences in several leaf oil terpenes were found between these and the eastern populations, which lends strong support to the taxonomic separation of ponderosa pine into th

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8

Podrázský, Vilém, Zdeněk Vacek, Stanislav Vacek, et al. "Production potential and structural variability of pine stands in the Czech Republic: Scots pine (Pinus sylvestris L.) vs. introduced pines – case study and problem review." Journal of Forest Science 66, No. 5 (2020): 197–207. http://dx.doi.org/10.17221/42/2020-jfs.

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Scots pine (Pinus sylvestris L.) is one of the most important tree species in Eurasia. During the past centuries, it has been extensively introduced into artificial monocultures, but is currently experiencing a number of problems related to climate change and extreme droughts. There is a large-scale disintegration of its stands and, in addition to its replacement by other native trees, it is possible to use a wide range of introduced species of the same genus. The aim of the investigation was to compare production parameters, structure and diversity of pine stands at the age of 35 years in sch

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9

Flanagan, Paul. "Efficay of a Systemic Insecticide in Reducing Populations of Black Pineleaf Scale (Nuculaspis Californica)." Arboriculture & Urban Forestry 29, no. 5 (2003): 303–5. http://dx.doi.org/10.48044/jauf.2003.036.

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In 2001, 66 ponderosa pines (Pinus ponderosa) infested with black pineleaf scale (Nuculaspis californica) near Leavenworth, Washington, U.S., were selected for an insecticide trial. Twenty-two pines were injected with a systemic insecticide in October 2001; in March 2002, an additional 22 pines were similarly injected. The remaining 22 pines served as a control. Branches were collected in October 2002, and scale density per meter of foliage was compared among the fall treatment, spring treatment, and control trees. Both spring and fall treatments significantly reduced scale densities on 2002 a

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10

Steinauer, Ernest M., and Thomas B. Bragg. "Ponderosa Pine (Pinus ponderosa) Invasion of Nebraska Sandhills Prairie." American Midland Naturalist 118, no. 2 (1987): 358. http://dx.doi.org/10.2307/2425792.

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11

Worden, Kelly J., and Catherine Kleier. "Impact of Thinning Ponderosa Pines (Pinus ponderosa) on Populations of Abert's Squirrels (Sciurus aberti)." Southwestern Naturalist 57, no. 4 (2012): 380–84. http://dx.doi.org/10.1894/0038-4909-57.4.380.

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12

Lowell, Eini C., and James M. Cahill. "Deterioration of Fire-Killed Timber in Southern Oregon and Northern California." Western Journal of Applied Forestry 11, no. 4 (1996): 125–31. http://dx.doi.org/10.1093/wjaf/11.4.125.

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Abstract Deterioration of fire-killed timber in the coastal mountains of southern Oregon and northern California was monitored over a 3 yr period (1988-1990). Defect was identified and measured on felled and bucked sample trees by using Scribner and cubic scaling rules. Douglas-fir (Pseudotsuga menziesii), grand fir (Abies grandis), white fir (A. concolor),ponderosa pine (Pinus ponderosa), and sugar pine (Pinus lambertiana), covering a wide range of geographic areas, site conditions, and tree size and age, were studied. One year after death, Douglas-fir, sugar pine, and ponderosa pine had lost

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13

Verbyla, David L., and Richard F. Fisher. "Ponderosa Pine Habitat Types as an Indicator of Site Quality in the Dixie National Forest, Utah." Western Journal of Applied Forestry 4, no. 2 (1989): 52–54. http://dx.doi.org/10.1093/wjaf/4.2.52.

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Abstract Forest habitat types have been purported to be useful indicators of site quality. This is generally true for habitat types with different dominant tree species. However, few have studied the site indicator value of habitat types with the same dominant tree species. We measured site index (base age 25) from 172 randomly selected plots within the ponderosa pine (Pinus ponderosa) zone of the Dixie National Forest, Utah. The range of site index within any one habitat type was broad. Poor sites occurred on all five habitat types. However, the best sites occurred only on the Pinus ponderosa

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14

Kenaley, Shawn, Robert Mathiasen, and E. James Harner. "Mortality Associated with a Bark Beetle Outbreak in Dwarf Mistletoe-Infested Ponderosa Pine Stands in Arizona." Western Journal of Applied Forestry 23, no. 2 (2008): 113–20. http://dx.doi.org/10.1093/wjaf/23.2.113.

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Abstract Ponderosa pine (Pinus ponderosa Douglas ex C. Lawson var. scopulorum Engelm.) mortality was evaluated from a 2002 bark beetle outbreak in areas infested with southwestern dwarf mistletoe (Arceuthobium vaginatum [Willd.] Presl subsp. cryptopodum [Engelm.] Hawksw. & Wiens) in a total of nine study sites in northern Arizona. Ponderosa pine mortality attributable to bark beetles (Ips and Dendroctonus spp., Scolytidae) was systematically sampled, and stand attributes, such as basal area, tree density, dwarf mistletoe severity, and site indices were recorded. Ponderosa pine mortality wa

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15

Fettig, Christopher, Tom DeGomez, Kenneth Gibson, Christopher Dabney, and Robert Borys. "Effectiveness of Permethrin Plus-C (Masterline ) and Carbaryl (Sevin SL ) for Protecting Individual, High-Value Pines (Pinus) From Bark Beetle Attack." Arboriculture & Urban Forestry 32, no. 5 (2006): 247–52. http://dx.doi.org/10.48044/jauf.2006.031.

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Bark beetles (Coleoptera: Scolytidae) are commonly recognized as the most important mortality agent in western North American coniferous forests. High-value trees such as those located in residential, recreational, or administrative sites are particularly susceptible to attack. Regardless of landowner objectives, tree losses in these unique environments generally have a catastrophic impact. The value of these individual trees, the cost of removal, and the loss of aesthetics may justify protection until the main thrust of a bark beetle infestation subsides. This situation emphasizes the need fo

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16

Fettig, Christopher J., Robert R. Borys, Stephen R. McKelvey, and Christopher P. Dabney. "Blacks Mountain Experimental Forest: bark beetle responses to differences in forest structure and the application of prescribed fire in interior ponderosa pineThis article is one of a selection of papers from the Special Forum on Ecological Studies in Interior Ponderosa Pine — First Findings from Blacks Mountain Interdisciplinary Research." Canadian Journal of Forest Research 38, no. 5 (2008): 924–35. http://dx.doi.org/10.1139/x07-243.

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Mechanical thinning and the application of prescribed fire are commonly used tools in the restoration of fire-adapted forest ecosystems. However, few studies have explored their effects on subsequent amounts of bark beetle caused tree mortality in interior ponderosa pine, Pinus ponderosa Dougl. ex P. & C. Laws. var. ponderosa. In this study, we examined bark beetle responses to creation of midseral (low diversity) and late-seral stages (high diversity) and the application of prescribed fire on 12 experimental units ranging in size from 76 to 136 ha. A total of 9500 (5.0% of all trees) Pinu

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17

Ankney, Elizabeth, Kathy Swor, Prabodh Satyal, and William N. Setzer. "Essential Oil Compositions of Pinus Species (P. contorta Subsp. contorta, P. ponderosa var. ponderosa, and P. flexilis); Enantiomeric Distribution of Terpenoids in Pinus Species." Molecules 27, no. 17 (2022): 5658. http://dx.doi.org/10.3390/molecules27175658.

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Pinus species are important in traditional medicine throughout their ranges, and pine essential oils are of interest in aromatherapy and as topical treatments. In this work, the leaf (needle) essential oils of Pinus ponderosa var. ponderosa and Pinus contorta subsp. contorta from Oregon and Pinus flexilis growing in Idaho, have been obtained by hydrodistillation and analyzed by gas chromatographic techniques. The leaf essential oil of P. ponderosa was dominated by β-pinene (21.5–55.3%), methyl chavicol (8.5–41.5%), α-pinene (3.6–9.6%), δ-3-carene (3.6–6.2%), and α-terpineol (1.4–5.3%). The maj

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18

Fettig, Christopher J., Christopher P. Dabney, Stephen R. McKelvey, and Dezene P. W. Huber. "Nonhost Angiosperm Volatiles and Verbenone Protect Individual Ponderosa Pines from Attack by Western Pine Beetle and Red Turpentine Beetle (Coleoptera: Curculionidae, Scolytinae)." Western Journal of Applied Forestry 23, no. 1 (2008): 40–45. http://dx.doi.org/10.1093/wjaf/23.1.40.

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Abstract Nonhost angiosperm volatiles (NAV) and verbenone were tested for their ability to protect individual ponderosa pines, Pinus ponderosa Dougl. ex. Laws., from attack by western pine beetle (WPB), Dendroctonus brevicomis LeConte, and red turpentine beetle (RTB), Dendroctonus valens LeConte (Coleoptera: Curculionidae, Scolytinae). A combination of (−)-verbenone and eight NAVs [benzyl alcohol, benzaldehyde, guaiacol, nonanal, salicylaldehyde, (E)-2-hexenal, (E)-2-hexen-1-ol, and (Z)-2-hexen-1-ol] (NAVV) significantly reduced the density of WPB attacks and WPB successful attacks on attracta

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19

Harrington, Michael G. "Ponderosa Pine Mortality from Spring, Summer, and Fall Crown Scorching." Western Journal of Applied Forestry 2, no. 1 (1987): 14–16. http://dx.doi.org/10.1093/wjaf/2.1.14.

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Abstract Mortality was compared among ponderosa pines (Pinus ponderosa) with various degrees of crown damage sustained during fall, spring, and summer prescribed burns. After 5 years, 12% of the trees scorched in the fall had died compared to 26% scorched in the spring, and 29% scorched in the summer. Eighty-five percent of this mortality occurred in trees less than 7 in. dbh. Scorch damage of up to 90% of the crown caused minimal mortality regardless of season. West. J. Appl. For. 2:14-16, Jan. 1987.

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20

Duane, Zinkel F., and Magee V. Thomas. "Resin acids of Pinus ponderosa needles." Phytochemistry 30, no. 3 (1991): 845–48. http://dx.doi.org/10.1016/0031-9422(91)85265-2.

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21

Anderson, Paul D., Brent Palmer, James L. J. Houpis, Mary K. Smith, and James C. Pushnik. "Chloroplastic responses of ponderosa pine (Pinus ponderosa) seedlings to ozone exposure." Environment International 29, no. 2-3 (2003): 407–13. http://dx.doi.org/10.1016/s0160-4120(02)00177-0.

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22

Thier, R. W., and M. A. Marsden. "VERTICAL GROWTH RESPONSE OF PONDEROSA PINE INFESTED BY WESTERN PINE SHOOT BORER, EUCOSMA SONOMANA KEARFOTT (LEPIDOPTERA: OLETHREUTIDAE)." Canadian Entomologist 122, no. 2 (1990): 343–47. http://dx.doi.org/10.4039/ent122343-3.

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AbstractIncidence of the western pine shoot borer, Eucosma sonomana Kearfott, and tree growth measurements from 5687 ponderosa pines, Pinus ponderosa Dougl. ex Laws., were recorded in the Calf Pen plantation Payette National Forest, ID. The percentage of trees infested by shoot borer generally increased as tree height increased.Infestation of the tree’s leader usually resulted in reduced height growth especially where needle length was shortened in the leader. Height growth of infested leaders was less than uninfested leaders. This difference in height growth increased with the total height of

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23

Gallo-Reynoso, Juan Pablo, Lucila Armenta-Méndez, Samuel Macías-Sánchez, Thomas R. Van Devender, Gloria Ponce-García, and Víctor Hugo Cabrera-Hernández. "Confirmation of the presence of Abert’s squirrel (Sciurus aberti) after a century in Sonora, México." Therya notes 2, no. 3 (2021): 156–59. http://dx.doi.org/10.12933/therya_notes-21-54.

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De acuerdo con algunos autores, la ardilla de Abert (Sciurus aberti) se encuentra típicamente en los bosques de pino blanco (Pinus ponderosa), árbol que les proporciona refugio y alimento. Estos pinos generalmente se distribuyen entre 1,800 y 3,000 m en Wyoming, Colorado, Nuevo México, Arizona y Utah en los Estados Unidos. Pinus arizonica era formalmente considerada una variedad de P. ponderosa en el norte de Sonora, México. Los bosques de la Sierra Madre Occidental no son monoespecíficos, los bosques de pino-encino son muy diversos desde Sonora y Chihuahua hasta el sur de Durango en México. E

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24

Erbilgin, Nadir, Andrew J. Storer, David L. Wood, and Thomas R. Gordon. "Colonization of cut branches of five coniferous hosts of the pitch canker fungus by Pityophthorus spp. (Coleoptera: Scolytidae) in central, coastal California." Canadian Entomologist 137, no. 3 (2005): 337–49. http://dx.doi.org/10.4039/n04-074.

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AbstractPitch canker of pines (Pinus spp.) and Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) (Pinaceae) is caused by the fungus Fusarium circinatum Nirenberg et O'Donnell. In California, infections by F. circinatum occur largely through wounds caused by insects. Field experiments were initiated to determine whether the colonization activities of twig beetles, Pityophthorus spp. (Coleoptera: Scolytidae), could explain the incidence of pitch canker on Monterey pine (P. radiata D. Don), Bishop pine (P. muricata D. Don), ponderosa pine (P. ponderosa var. ponderosa Dougl.), knobcone pine (P.

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Grosman, Donald M., Christopher J. Fettig, Carl L. Jorgensen, and A. Steven Munson. "Effectiveness of Two Systemic Insecticides for Protecting Western Conifers from Mortality Due to Bark Beetle Attack." Western Journal of Applied Forestry 25, no. 4 (2010): 181–85. http://dx.doi.org/10.1093/wjaf/25.4.181.

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Abstract Bark beetles (Coleoptera: Curculionidae, Scolytinae) are important tree mortality agents in western coniferous forests. Protection of individual trees from bark beetle attack has historically involved applications of liquid formulations of contact insecticides to the tree bole using hydraulic sprayers. More recently, researchers looking for more portable and environmentally safe alternatives have examined the effectiveness of injecting small quantities of systemic insecticides directly into trees. In this study, we evaluated trunk injections of experimental formulations of emamectin b

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Hanson, Chad T., and Malcolm P. North. "Post-fire survival and flushing in three Sierra Nevada conifers with high initial crown scorch." International Journal of Wildland Fire 18, no. 7 (2009): 857. http://dx.doi.org/10.1071/wf08129.

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With growing debate over the impacts of post-fire salvage logging in conifer forests of the western USA, managers need accurate assessments of tree survival when significant proportions of the crown have been scorched. The accuracy of fire severity measurements will be affected if trees that initially appear to be fire-killed prove to be viable after longer observation. Our goal was to quantify the extent to which three common Sierra Nevada conifer species may ‘flush’ (produce new foliage in the year following a fire from scorched portions of the crown) and survive after fire, and to identify

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27

Zhang, Jianwei, Martin W. Ritchie, Douglas A. Maguire, and William W. Oliver. "Thinning ponderosa pine (Pinus ponderosa) stands reduces mortality while maintaining stand productivity." Canadian Journal of Forest Research 43, no. 4 (2013): 311–20. http://dx.doi.org/10.1139/cjfr-2012-0411.

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We analyzed 45 years of data collected from three ponderosa pine (Pinus ponderosa Douglas ex P. Lawson & C. Lawson) levels-of-growing-stock installations in Oregon (OR) and northern California (CA), USA, to determine the effect of stand density regimes on stand productivity and mortality. We found that periodic annual increment (PAI) of diameter, basal area (BA), volume, and aboveground dry mass were significantly related to stand density index (SDI) and stand age at start of the period; the quadratic trends varied among sites. Precipitation departure from the normal for each period explai

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28

Zhang, Jianwei, William W. Oliver, and Robert F. Powers. "Reevaluating the self-thinning boundary line for ponderosa pine (Pinus ponderosa) forests." Canadian Journal of Forest Research 43, no. 10 (2013): 963–71. http://dx.doi.org/10.1139/cjfr-2013-0133.

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The self-thinning rule has been used extensively to predict population dynamics under intraspecific and interspecific competition. In forestry, it is an important silvicultural concept for maintaining stand health in the face of climate change and biotic stress, but uncertainty exists because traditional self-thinning limits were set subjectively without regard to site quality. We addressed this by analyzing ponderosa pine (Pinus ponderosa Lawson & C. Lawson) data from 109 research plots measured repeatedly and 59 inventory plots measured once across California. Self-thinning boundaries we

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Vyse, Alan, Michelle R. Cleary, and Ian R. Cameron. "Tree species selection revisited for plantations in the Interior Cedar Hemlock zone of southern British Columbia." Forestry Chronicle 89, no. 03 (2013): 382–91. http://dx.doi.org/10.5558/tfc2013-068.

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We provide results from two trials comparing performance of species of known provenance planted on logged sites in the southern Interior Cedar Hemlock biogeoclimatic zone of southern British Columbia 20 and 26 years after establishment. The commonly used plantation species, lodgepole pine (Pinus contorta var. latifolia), interior spruce (a naturally occurring hybrid between Picea glauca and P. engelmannii) and Douglas-fir (Pseudotsuga menziesii var. glauca), survived as well as, but grew more slowly than, western larch (Larix occidentalis), western white pine (Pinus monticola) and ponderosa pi

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Lowary, T. L., and G. N. Richards. "Vacuum Pyrolysis of Bark From Pinus Ponderosa." Journal of Wood Chemistry and Technology 8, no. 3 (1988): 393–412. http://dx.doi.org/10.1080/02773818808070692.

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Allred, W. Sylvester, and William S. Gaud. "Green Foliage Losses from Ponderosa Pines Induced by Abert Squirrels and Snowstorms: A Comparison." Western Journal of Applied Forestry 8, no. 1 (1993): 16–18. http://dx.doi.org/10.1093/wjaf/8.1.16.

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Abstract Abert squirrels (Sciurus aberti) are obligate herbivores on ponderosa pine (Pinus ponderosa). The inner bark of pine shoots is considered one of the predominant food resources obtained by foraging squirrels. As squirrels forage for this resource they induce green needle losses from chosen feed trees. Amounts of induced green needle losses appear to vary according to the availability of alternative foods and squirrel population densities. Weather also induces green needle losses to ponderosa pines. Results of this study indicate that, at least in some years, heavy snowstorms can induce

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Perrakis, Daniel DB, and James K. Agee. "Seasonal fire effects on mixed-conifer forest structure and ponderosa pine resin properties." Canadian Journal of Forest Research 36, no. 1 (2006): 238–54. http://dx.doi.org/10.1139/x05-212.

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This study examined the effects of spring and fall restoration burning in an old-growth mixed-conifer ponderosa pine (Pinus ponderosa Dougl. ex P. & C. Laws.) forest in southern Oregon. Variables measured include fuel loads, forest structure indices, mortality of large ponderosa pines, and pine resin defenses. One year after treatment, reductions in surface fuel loads and changes to forest structure parameters suggested that burning treatments could meet restoration objectives, with fall burns being somewhat more effective than spring burns. However, mortality of pre settlement pines was

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33

Krauze-Baranowska, Mirosława, Marek Mardarowicz, Marian Wiwart, Loretta Pobłocka, and Maria Dynowska. "Antifungal Activity of the Essential Oils from Some Species of the Genus Pinus." Zeitschrift für Naturforschung C 57, no. 5-6 (2002): 478–82. http://dx.doi.org/10.1515/znc-2002-5-613.

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The chemical composition of the essential oils from the needles of Pinus ponderosa (north american pine), P. resinosa (red pine) and P. strobus (eastern white pine) has been determined by GC/MS (FID). The essential oils from P. resinosa and P. ponderosa in comparison to P. strobus have been characterized by the higher content of β-pinene (42.4%, 45.7% and 7.9% respectively). On the other hand, α-pinene (17.7%) and germacrene D (12.2%) were dominant compounds of P. strobus. Moreover the essential oil from P. resinosa was more rich in myrcene-15.9%. Estragole and Δ-3-carene, each one in amount c

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Regelbrugge, JC, and SG Conard. "Modeling Tree Mortality Following Wildfire in Pinus ponderosa Forests in the Central Sierra-Nevada of California." International Journal of Wildland Fire 3, no. 3 (1993): 139. http://dx.doi.org/10.1071/wf9930139.

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We modeled tree mortality occurring two years following wildfire in Pinus ponderosa forests using data from 1275 trees in 25 stands burned during the 1987 Stanislaus Complex fires. We used logistic regression analysis to develop models relating the probability of wildfire-induced mortality with tree size and fire severity for Pinus ponderosa, Calocedrus decurrens, Quercus chrysolepis, and Q. kelloggii. One set of models predicts mortality probability as a function of DBH and height of stem-bark char, a second set of models uses relative char height (height of stem-bark char as a proportion of

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35

MacQuarrie, Chris J. K., and Barry J. Cooke. "Density-dependent population dynamics of mountain pine beetle in thinned and unthinned stands." Canadian Journal of Forest Research 41, no. 5 (2011): 1031–46. http://dx.doi.org/10.1139/x11-007.

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Thinning, the selective removal of some trees from a forest, is one way forest managers can reduce the probability that a forest will be susceptible to attack by bark beetles. Although this method has been shown to be effective, it is not clear whether the effect arises when pre-outbreak populations are small or during the epidemic phase when outbreaks are growing. We adopted a population dynamics approach to determine if the effect of limit or basal area thinning could be observed in the form of differential beetle recruitment using lodgepole pine ( Pinus contorta Dougl. ex Loud.) and pondero

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36

Qian, Y. L., J. M. Fu, J. Klett, and S. E. Newman. "Effects of Long-Term Recycled Wastewater Irrigation on Visual Quality and Ion Concentrations of Ponderosa Pine." Journal of Environmental Horticulture 23, no. 4 (2005): 185–89. http://dx.doi.org/10.24266/0738-2898-23.4.185.

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Abstract Recycled wastewater (RWW) has become a common water source for irrigating golf courses and urban landscapes. Ponderosa pine (Pinus ponderosa) is commonly used in urban landscape settings in the Rocky Mountain West. To evaluate the effects of RWW irrigation on quality and needle ion accumulations of ponderosa pine, eight landscape facilities near metropolitan Denver, CO, were selected for the experiment. Among these sites, four had been irrigated exclusively with domestic RWW [electrical conductivity (EC) = 0.84 dS/m] for 5, 6, 15, and 20 years, respectively. The other four with simila

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37

Negrón, José F. "Within-Stand Distribution of Tree Mortality Caused by Mountain Pine Beetle, Dendroctonus ponderosae Hopkins." Insects 11, no. 2 (2020): 112. http://dx.doi.org/10.3390/insects11020112.

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The mountain pine beetle (MPB) (Dendroctonus ponderosae) is a bark beetle that attacks and kills ponderosa pine (Pinus ponderosa), among other pine species throughout the western conifer forests of the United States and Canada, particularly in dense stands comprising large trees. There is information on the stand conditions that the insect prefers. However, there is a paucity of information on how small-scale variation in stand conditions influences the distribution of tree mortality within a stand. I examined the small-scale distribution of ponderosa pine basal area pre- and post a mountain p

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38

Nepal, Sushil, Bianca N. I. Eskelson, and Martin W. Ritchie. "Difference in Regeneration Conditions in Pinus ponderosa Dominated Forests in Northern California, USA, over an 83 Year Period." Forests 11, no. 5 (2020): 581. http://dx.doi.org/10.3390/f11050581.

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Forest inventories based on field surveys can provide quantitative measures of regeneration such as density and stocking proportion. Understanding regeneration dynamics is a key element that supports silvicultural decision-making processes in sustainable forest management. The objectives of this study were to: 1) describe historical regeneration in ponderosa pine dominated forests by species and height class, 2) find associations of regeneration with overstory, soil, and topography variables, 3) describe contemporary regeneration across various management treatments, and 4) compare differences

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39

Gernandt, David S., Sergio Hernández-León, Esmeralda Salgado-Hernández, and Jorge A. Pérez de La Rosa. "Phylogenetic Relationships of Pinus Subsection Ponderosae Inferred from Rapidly Evolving cpDNA Regions." Systematic Botany 34, no. 3 (2009): 481–91. http://dx.doi.org/10.1600/036364409789271290.

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Pinus subsection Ponderosae includes approximately 17 tree species distributed from western Canada to Nicaragua. We inferred phylogenetic relationships of multiple accessions for all widely recognized species from 3.7 kb of cpDNA sequence (matK, trnD-trnY-trnE spacer, chlN-ycf1 spacer, and ycf1). The sister relationship between subsections Ponderosae and Australes was corroborated with high branch support, and several clades, most with lower branch support, were identified within subsection Ponderosae. Pinus jeffreyi was sister to P. coulteri, P. sabiniana, and P. torreyana. Californian access

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Wiedenhoeft, Alex C., Regis B. Miller, and Terra J. Theim. "Analysis of Turee Microscopic Cuaracters for Separating the Wood of Pinus Contorta and P. Ponderosa." IAWA Journal 24, no. 3 (2003): 257–67. http://dx.doi.org/10.1163/22941932-90001595.

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Three microscopic characters were evaluated for the identification of Pinus contorta and Pinus ponderosa. The tangential diameter of the resin canals, including the epithelium, was compared to the tangential diameter of the entire resin canal complex. The latter measurement was shown to give diagnostic results for these species. Data from the examination of ray composition do not support previously published methods for separating P. contorta and P. ponderosa. The presence or absence of small elongate crystals in the subsidiary parenchyma of the resin canal complexes was shown to be the most p

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Dumroese, R. Kasten. "Marking Tree Seeds with Spray Paint for Germination Studies." Western Journal of Applied Forestry 18, no. 3 (2003): 175–78. http://dx.doi.org/10.1093/wjaf/18.3.175.

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Abstract I evaluated the potential use of spray paint for marking conifer seeds for germination studies in forest nurseries. For bulk seedlots of large-seeded species like western white pine (Pinus monticola), ponderosa pine (Pinus ponderosa), and Douglas-fir (Pseudotsuga menziesii), paint had little or no effect on six different germination parameters, but negatively affected germination of western larch (Larix occidentalis). On a family level with pine seeds, spray paint may or may not be appropriate depending on the specific objectives of the researcher and the level of conservatism used. W

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42

McDonald, P. M., S. R. Mori, and G. O. Fiddler. "Effect of competition on genetically improved ponderosa pine seedlings." Canadian Journal of Forest Research 29, no. 7 (1999): 940–46. http://dx.doi.org/10.1139/x99-061.

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In northern California, ponderosa pine (Pinus ponderosa Dougl. ex Laws. var. ponderosa) height and diameter growth were analyzed to determine if genetically improved seedlings were more competitive than other vegetation and if they outgrew nursery stock in the field. Analysis of growth during the third through sixth growing seasons (1992-1995), indicated no statistical differences for pine height or diameter among genetic classes (control pollinated, wind pollinated, nursery run) when grown with competing vegetation. In 1995, mean height of seedlings grown with competition was 2.4 m for contro

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Lesser, Mark R., and Stephen T. Jackson. "Reliability of macrofossils in woodrat (Neotoma) middens for detecting low-density tree populations." Paleobiology 37, no. 4 (2011): 603–15. http://dx.doi.org/10.1666/10053.1.

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Macrofossils from woodrat (Neotoma) middens serve as an important proxy for reconstructing past vegetation in arid and semiarid regions of North America. The presence/absence of plant macrofossils in middens can provide valuable information on temporal and spatial patterns of plant migration and range boundaries. The primary aim of this study was to determine how local plant abundance, distance of plant populations from midden sites, and species population density on the landscape affect the probability of occurrence of macrofossils in middens. The study was designed with the primary intent of

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44

Jovanovski, Alejandro, Hernan Poblete, Marco Torres, and Alicia Fernandez. "Caracterización preliminar tecnológica de Pinus ponderosa (Dougl.) creciendo en Chile." Bosque 19, no. 2 (1998): 71–76. http://dx.doi.org/10.4206/bosque.1998.v19n2-08.

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45

Barroetaveña, Carolina, and Mario Cázares Rajchenberg. "Mycorrhizal fungi in Pinus ponderosa introduced in Central Patagonia (Argentina)." Nova Hedwigia 80, no. 3-4 (2005): 453–64. http://dx.doi.org/10.1127/0029-5035/2005/0080-0453.

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46

Owen, Donald R., David L. Wood, and John R. Parmeter. "Association between Dendroctonus valens and black stain root disease on ponderosa pine in the Sierra Nevada of California." Canadian Entomologist 137, no. 3 (2005): 367–75. http://dx.doi.org/10.4039/n04-084.

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AbstractThe host-colonization behavior of the red turpentine beetle, Dendroctonus valens LeConte (Coleoptera: Scolytidae), was investigated in stands of ponderosa pine, Pinus ponderosa P. & C. Lawson (Pinaceae), with black stain root disease in the central Sierra Nevada of California. By felling live trees, we found that trees with pitch tubes produced during the initiation of tunneling by D. valens had a significantly higher incidence of black stain root disease, caused by Leptographium wageneri var. ponderosum (Harrington et Cobb), than trees without pitch tubes. Trees with the most D. v

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47

Thies, Walter G., Douglas J. Westlind, and Mark Loewen. "Season of prescribed burn in ponderosa pine forests in eastern Oregon: impact on pine mortality." International Journal of Wildland Fire 14, no. 3 (2005): 223. http://dx.doi.org/10.1071/wf04051.

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A study of the effects of season of prescribed burn on tree mortality was established in mixed-age ponderosa pine (Pinus ponderosa Dougl. ex Laws.) at the south end of the Blue Mountains near Burns, Oregon. Each of six previously thinned stands was subdivided into three experimental units and one of three treatments was randomly assigned to each: fall 1997 burn, spring 1998 burn, and no burning (control). Burns were conducted as operational prescribed burns. Trees within six 0.2-ha circular plots on each experimental unit were observed for four post-burn growing seasons to determine fire damag

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GAIMARI, STEPHEN D. "Two new genera of Nearctic Chamaemyiidae (Diptera: Lauxanioidea) associated with Cinara aphids (Hemiptera: Aphididae) on Pinus." Zootaxa 4852, no. 1 (2020): 61–82. http://dx.doi.org/10.11646/zootaxa.4852.1.3.

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Two new genera of Chamaemyiidae (Diptera: Lauxanioidea) are described and illustrated, including: Chamaethrix gen. nov. (type species Chamaethrix necopina sp. nov.), possibly a predator of Cinara ponderosae (Williams) on Pinus ponderosa in the southwestern United States; and Vitaleucopis gen. nov. (type species Vitaleucopis nidolkah sp. nov.; other included species Vitaleucopis astonea (McAlpine), comb. nov., and Vitaleucopis scopulus sp. nov.), predators of Cinara aphids and possibly adelgids on Pinaceae in western North America. Immature stages are discussed or described and illustrated for

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Kelley, S. S., T. G. Rials, L. R. Groom, and C. L. So. "Use of near infrared spectroscopy to predict the mechanical properties of six softwoods." Holzforschung 58, no. 3 (2004): 252–60. http://dx.doi.org/10.1515/hf.2004.039.

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Abstract The visible and near infrared (NIR) (500–2400 nm) spectra and mechanical properties of almost 1000 small clearwood samples from six softwood species: Pinus taeda L. (loblolly pine), Pinus palustris, Mill. (longleaf pine), Pinus elliottii Engelm. (slash pine), Pinus echinata Mill. (shortleaf pine), Pinus ponderosa Dougl. ex Laws (ponderosa pine), and Pseudotsuga menziesii (Mirb.) Franco (Douglas fir) were measured. Projection to Latent Structures (PLS) modeling showed that the NIR spectra of these softwoods could be used to predict the mechanical properties of the clear-wood samples. T

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Keyes, Christopher R., and Rubén Manso González. "Climate-influenced ponderosa pine (Pinus ponderosa) seed masting trends in western Montana, USA." Forest Systems 24, no. 1 (2015): 021. http://dx.doi.org/10.5424/fs/2015241-05606.

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