Relevant bibliographies by topics / Range management / Dissertations / Theses
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Dissertations / Theses on the topic 'Range management'

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Published: 4 June 2021
Last updated: 29 July 2024

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1

Faulkner, Dan B. "Management Factors to Improve Range Cow Reproduction." College of Agriculture, University of Arizona (Tucson, AZ), 2016. http://hdl.handle.net/10150/602232.

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2 pp.<br>Every ranch has unique labor and range resources. It is important to develop a nutrition and management program that is well matched to each individual ranch. Doing this can dramatically improve reproduction and ultimately the economic return to the ranch.
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2

Harper, John Michael 1954. "Feeding stations of feeder lambs (Ovis aires) as an indicator of diminished forage quality and supply while grazing south central Arizona alfalfa (Medicago sativa L.)." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278147.

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Grazing trials were conducted on irrigated fall/winter pastures near Maricopa, Arizona where 270 feeder lambs were stocked in 16-ha paddocks to explore the use of grazing behavior as an indicator of forage quantity and quality. Sheep behavior was monitored by filming the grazing periods with a VHS camera and recording the length of time that an individual spent at a feeding station, defined here as a feeding station interval. Other measurements included observed steps between feeding stations (step-sets), feeding stations min⁻¹, steps min⁻¹ and biting rate. As grazing progressed, lambs increas
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3

FLOYD, DONALD WINTERS. "THE POLICY OF EXPERIMENTAL STEWARDSHIP ON PUBLIC RANGELANDS." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183950.

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Between July and September, 1985, 70 ranchers, environmentalists and agency officials participating in three chartered Experimental Stewardship Program (ESP) areas were interviewed. Committee records and agency documents were also examined. As a result of the field work three conclusions were reached: (1) conflicts over grazing decisions have been significantly reduced by the stewardship process, (2) available data is insufficient to support conclusions about changes in the ecological status of the plant communities within the stewardship areas and (3) the annual economic value of rangeland re
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4

Littlefield, Joanne. "The Santa Rita Experimental Range Turns 100: Vegetation and Wildlife Studies Assist Range Management." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/622228.

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5

Sankey, Joel Brown. "Modeling Soil Water Content for Precision Range Management." Thesis, Montana State University, 2005. http://etd.lib.montana.edu/etd/2005/sankey/SankeyjJ1205.pdf.

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I developed site-specific empirical models to predict spring soil water content for two Montana ranches. The models used publicly available Landsat TM 5, USGS DEM, and soil survey-derived data as predictor variables. The goal of the project was to test whether ranchers could collect a limited size soil water content data set, build sitespecific regression models based on the data set, and construct soil water content maps based on the models. The response variable for models consisted of 100 and 82 average soil profile mass water content samples for each ranch, respectively. Half the samples w
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6

Woolsey, Roy B. "AUTOMATIC TOOLS FOR TELEMETRY TEST RANGE SPECTRUM MANAGEMENT." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606489.

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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>Automatic spectrum management and monitoring systems are very useful to manage frequencies at test ranges and assure interference-free transmission of telemetry signals. Spectrum management systems assign telemetry frequencies using database information on available and occupied channels and analysis tools which can determine whether a data link will support telemetry. Modern, DSP-based spectrum monitoring systems, in fixed or mobile configurations,
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7

Grace, Thomas B., Allison R. Bertrand, and Todd A. Newton. "Applying the iNET System Management Standard." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/605991.

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ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>The System Management Standard Working Group (SMSWG) of the integrated Network- Enhanced Telemetry (iNET) project has developed a standard for the management of the Telemetry Network System (TmNS). The introduction of Internet Protocol (IP) networks on test ranges has created the potential for greater flexibility and improved usability in the telemetry environment. This paper will discuss how
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8

Hadjicostas, Thyrsos Panayiotis. "Long-range power system planning with load management options." Thesis, Queen Mary, University of London, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267634.

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9

Pacheco, Leopoldo Arturo IV. "Nutritional and range management practices for breeding beef females." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/16806.

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Doctor of Philosophy<br>Department of Animal Sciences and Industry<br>KC Olson<br>The objective of this series of studies was to develop and improve methods of production in cow/calf operations of the Great Plains. Ultrasound measures of longissimus muscle depth (LMD) and intramuscular fat (IMF) of Angus × heifers were used to predict lifetime cow productivity. IMF and LMD were categorized into high, medium, and low groups (IMFG and LMDG, respectively). Cows in the high and medium LMDG had greater (P < 0.05) pregnancy rates than cows in the low LMDG. Calf BW at weaning increased (P < 0.05) as
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10

Didier, Elizabeth Anne. "Adoption of Range Management Innovations by Utah Livestock Producers." DigitalCommons@USU, 2002. https://digitalcommons.usu.edu/etd/7429.

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Recent years have seen changes in ecological conditions, ownership patterns, and political-legal forces that affect the sustainability of Western range livestock production. Enterprise diversification and implementation of improvements are advocated as ways for ranchers to cope with marginal returns from ranching while better managing resources. However, relatively few ranchers make such substantive changes in their operations, and previous research suggests that rates of adoption may be especially low in Utah. Using a qualitative approach, this study explored innovation adoption among Utah ra
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11

Norris, Aaron B. "Autumn and winter dynamics of white-tailed deer browse nutritive value in the southern Cross Timbers and Prairies." Thesis, Tarleton State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1598307.

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<p>White-tailed deer (<i>Odocoileus virginianus</i>) are aesthetically and economically important to landowners in Texas. Deer herd health, productivity and survivability decline when population size exceeds the available forage. During stressful times, such as dry winter periods, nutrition is limited and forage availability decreases drastically. White-tailed deer winter diets are mainly comprised of browse species because herbaceous production decreases as winter progresses. The objective of this study was to determine the influence of winter progression on nitrogen (N) and fiber concentrati
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12

Yehudai, Joseph. "A Study of the Relationship between the Intensity of Short-Range and Medium-Range Capacity Management and the Effectivenesss of Manufacturing Operations." Thesis, North Texas State University, 1988. https://digital.library.unt.edu/ark:/67531/metadc331834/.

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The objective of this study was to examine the relationship between intensity of short-range and medium-range capacity management and effectiveness of manufacturing operations. Data were collected to test the null hypothesis which stated that intensity of short-range and medium-range capacity management does not influence manufacturing effectiveness. Intensity of short-range and medium-range capacity management was indicated by the following variables: (1) production standards; (2) priority determination; (3) delivery dates determination; (4) material requirements planning; (5) routing informa
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13

Watters, Susan Elaine 1959. "Site stability assessment on a clay loam upland range site." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/291494.

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Ground cover, species composition, average distance between perennial plants, standing biomass, frequency of bare quadrats, and site stability rating were evaluated as predictor variables in determining the degree of site protection from accelerated soil erosion on a clay loam upland range site. Interpretations of range condition, species diversity, and the WEPP model predicted sediment yield were analyzed to determine their usefulness in detecting a threshold of site protection. Standing biomass, basal cover, average distance between plants and frequency of bare quadrats demonstrated strong c
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14

Hecker, Garret Allen. "Assessment of Watershed Health on Intermittent Watersheds in Southwestern North Dakota." Thesis, North Dakota State University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10285615.

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<p> Watersheds are complex systems that are influenced by many factors including geomorphology, climate, soil, vegetation, and land management. Due to this complexity, a watershed assessment that evaluates both the riparian and upland areas has yet to be developed. We proposed investigating a combination of plant community composition within the greenline, upland ecological site function assessment with the Interpreting Indicators of Rangeland Health (IIRH) protocol, and stream morphological parameters. Stream parameters investigated were Rosgen&rsquo;s classification method, bank erosion haza
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15

Sumrall, Lee Bradford 1962. "Seedbed ecology and emergence of Lehmann lovegrass (Eragrostis lehmanniana Nees) as influenced by burning." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277328.

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Lehmann lovegrass (Eragrostis lehmanniana Nees) is a warm-season bunchgrass native to South Africa which dominates many desert grasslands in southern Arizona. To determine why fire results in high seedling recruitment of this species, seedbank germination and field seedling emergence were measured in relation to (1) no treatment, (2) burning, (3) clipping and herbicide and (4) herbicide only. Treatments were replicated over 2 years on a stand of Lehmann lovegrass at the Santa Rita Experimental Range. Canopy removal, by either clipping or burning, significantly increased seedling emergence in s
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16

DeMuth, Carol Ann 1957. "Seasonal variation in utilization estimates on sideoats grama plants." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277939.

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The variability in utilization estimates using seasonal production data from clipped sideoats grama plants was studied in southeastern Arizona. Three intensities of clipping at four seasons were studied. Regrowth was also examined. Current growth was highest in October and lowest in June, whereas, standing dead material was lowest in February and highest in June. By April 1986, 39% of peak current growth was already produced. Total peak standing crop occurred in October. The sum of current growth and regrowth from heavy clipping was greater than for plants clipped heavily only in October. The
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17

Wissler, Craig Alan 1959. "A spatial modeling approach for predicting forage production and utilization on a semidesert grassland." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/278311.

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Geographic analysis procedures and multiple linear regression techniques are applied to the problem of generalizing forage production and utilization information from sample point data. The study involves the application of these procedures to predict the spatial variability of mean production and utilization of Digitaria californica on the Santa Rita Experimental Range near Tucson, Arizona. Analysis of ten-year means from data collected between 1957 and 1966 indicate that variability in production is a function of mean summer precipitation and elevation. Variability in utilization is found to
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18

Halstead, Lacey E. 1970. "Monitoring elk and cattle forage use under a specialized grazing system in Arizona." Thesis, The University of Arizona, 1998. http://hdl.handle.net/10150/278684.

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The grazing system I studied is intended to promote sustainable elk (Cervus elaphus) and cattle use, attracting elk to cattle-grazed pastures, thus resting the others. My objective was to determine whether the grazing system (1) promotes sustainable levels of forage use and (2) rests half the pastures each year. The grazing system did promote sustainable forage use but did not rest half the pastures; elk used all study pastures. Elk grazing patterns depended more on cover and topography than the grazing system. Essential to the study of grazing interactions are reliable utilization data. My ob
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19

Mitton, Nancy Louise 1951. "The effect of grazing, mowing and herbicide application of johnsongrass (Sorghum halepense (L.) Pers.) in the Nature Conservancy Patagonia-Sonoita Creek Preserve." Thesis, The University of Arizona, 1996. http://hdl.handle.net/10150/291553.

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Johnsongrass (Sorshum halepense (L.) Pers.) occurred in nearly pure stands on the Patagonia-Sonoita Creek Preserve, Santa Cruz County, Arizona prior to grazing. This study investigated the use of grazing, mowing and herbicides to decrease the abundance of johnsongrass, and increase the diversity of other plant species. The grazed only treatment allowed remaining overstory and limited grazing access. Mowing lowered the overstory and provided accessibility to grazing attracting animal utilization of the areas. The herbicided and grazed treatment reduced total johnsongrass productivity, tiller nu
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20

Heyboer, Maarten. "Knowledge-development in applied science: the case of range management." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/46039.

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<p>This study traces the evolution of the applied ecological discipline of range management in terms of the goals, methods, concepts, and criteria developed by range management for their science between 1897 and 1920. It argues, in contrast to the traditional view uÌ uat describes the knowledge-development process in applied science as just science applied to social problems, that wider social goals, values, concepts, and criteria play a definite role in shaping the applied science knowledge-development process.</p> <p> The first generation of range management allowed the primary users
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21

Batts, Gregory K. "An assessment of Quality Deer Management on a private hunt club in the Virginia Piedmont." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/32818.

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I examined the efficacy of Quality Deer Management (QDM) on Amelia Springs hunt club in Amelia County, Virginia, during 2003-2006. I examined home range dynamics of male white-tailed deer (Odocoileus virginianus), deer/hunter interactions, and aspects of population dynamics. I also developed a new rocket net method to capture deer using a remote video system that was more efficient than traditional methods. I monitored 20 deer; 50% died due to hunting and 15% to natural mortality. The emigration rate for juvenile males was 46%, dispersal distance averaged 6.4 km. I used Home Range Extension (H
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22

Goldman, Daniel A. "Multidimensional range searching using G-tree and B*-tree indexing." Diss., Online access via UMI:, 2005.

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23

Awuondo, Benjamin Martin Onyango. "Long range planning of manufacturing footprint." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117977.

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Thesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, in conjunction with the Leaders for Global Operations Program at MIT, 2018.<br>Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, in conjunction with the Leaders for Global Operations Program at MIT, 2018.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 57-58).<br>Firms developing an Operations Strategy need to make decisions across a wide spectrum. Within the field of operations strategy, common practice defines the stratification of
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24

Friede, Anne [Verfasser]. "The dynamics of long-range regressions during sentence reading / Anne Friede." Wuppertal : Universitätsbibliothek Wuppertal, 2021. http://d-nb.info/1236278194/34.

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25

Wilmer, Hailey. "Cattle ranching on the western Great Plains| A study of adaptive decision-making." Thesis, Colorado State University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10195482.

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<p> Ranching social-ecological systems (SESs) in the semi-arid, western Great Plains persist under highly variable inter- and intra-annual weather conditions and globally influenced markets. Ranch spatial scales and manager decision-making processes have traditionally been excluded from conventional grazing experiments, leading to considerable debate between scientists and land mangers about grazing strategies to achieve both beef production and biodiversity conservation outcomes on rangelands. In this dissertation I use collaborative, interdisciplinary methodologies to link rangeland and g
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26

Nkombe, Boniphace Mokiri. "INVESTIGATION OF THE POTENTIAL FOR FORAGE SPECIES TO ENHANCE THE SUSTAINABILITY OF DEGRADED RANGELAND AND CROPLAND SOILS." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469175348.

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27

Neuman, Michael John 1964. "Packstock hoofprint depth and soil strength relationships in wet meadow soils of Sequoia and Kings Canyon National Parks, California." Thesis, The University of Arizona, 1996. http://hdl.handle.net/10150/278574.

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Penetrometer soil strength and the depth of packstock hoofprints were studied in two subalpine meadows in an attempt to develop a method for determining the seasonal readiness of wilderness meadows for packstock grazing at Sequoia & Kings Canyon National Parks, California. Soil and vegetation parameters (bulk density, water content, percent gravel, sand, silt, clay, and organic matter, above-ground biomass, and below-ground biomass in two diameter size classes) were also studied in order to understand their influence on soil strength and hoofprint depth. Of the four penetrometer tip sizes test
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28

Lawrence, Paul Anthony 1960. "The role of data sources and simulation model complexity in using a prototype decision support system." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/290625.

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Multiobjective decision support systems (DSS) are gaining acceptance as tools to evaluate resource management systems. Before applying a DSS, a matrix of decision criteria and alternative management systems is populated using information from measured data, expert opinion or simulation models. As each information source exhibits differences in data availability and accuracy, the extent to which outcomes from the DSS are influenced by the source of information remains an important issue. A conceptual framework links the Prototype Decision Support System (P-DSS) developed by the USDA-ARS Southwe
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Puno, Victor. "Fusarium Wilt of Watermelon in Australia: Biology and Management." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/18739.

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Fusarium wilt of watermelon is one of the most economically significant diseases worldwide, causing severe losses. The main pathogen is Fusarium oxysporum f.sp. niveum (Fon) and is present in major watermelon production regions of the world. Currently, there is a severe lack of information regarding the distribution and biology of this important pathogen in Australia. An ad hoc survey of Australian watermelon production regions was conducted to evaluate impact and incidence of wilt disease, and determine if Fon was the predominant pathogen. Incidence and severity ranged from moderate to severe
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30

Goulet, Dennis A., Joseph McMorrow, G. Edward Roberts, and Robert Lynch. "VESSEL TRAFFIC MANAGEMENT SYSTEM A Test Technology Development and Demonstration Project." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/607390.

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International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>The Vessel Traffic Management System is a cooperative effort of the Naval Undersea Warfare Center and the Naval Air Warfare Center Aircraft Division, funded by the OSD's Test Technology Development and Demonstration Program. The project is establishing the capability to acquire ship tracking information from numerous sources (GPS and radar target extractors), and combine them into a comprehensive, integrated view of the range safety target area. The consolida
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31

Ryu, Jae Hyeon. "The management of water resources using a mid-range climate forecast model /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/10118.

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32

Goldstein, Emily A., Fidelma Butler, and Colin Lawton. "Modeling future range expansion and management strategies for an invasive squirrel species." Springer, 2016. http://hdl.handle.net/10150/612964.

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Successful management of an invasive species requires in depth knowledge of the invader, the invaded ecosystem, and their interactions. The complexity of the species-system interactions can be reduced and represented in ecological models for better comprehension. In this study, a spatially explicit population model was created using the RAMAS software package to simulate the past and future invasion dynamics of the eastern grey squirrel (Sciurus carolinensis) in the fragmented habitat in case study areas in Ireland. This invasive squirrel species causes economic damage by bark strip
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33

Sugumaran, Ramanathan. "Development of a Range Management Decision Support System (RAMDSS) for forest planning in the Banavasi Range of the Western Ghats, India." Thesis, University of Edinburgh, 2000. http://hdl.handle.net/1842/22672.

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In this project, a RAnge Management Decision Support System (RAMDSS) has been developed to assist the forest manager in improving day-to-day planning processes in a case study of the Banavasi Range of the Western Ghats, India. In this prototype, three major data types were collected namely, spatial data such as administrative boundaries, soil, contours, forest land use/cover, geology and geomorphology, non-spatial data such as socio-economic, and forestry inventory, and finally knowledge from the experts and other sources. In the prototype RAMDSS, all of this information was imported into a co
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Lee, Myoung Ho. "An analysis and assessment of the regional forest resources : range sector." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/24342.

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35

Kennedy, Caroline A. "Learning and Application of Range Management Innovations Among Ranchers in West-Central Colorado." DigitalCommons@USU, 2005. https://digitalcommons.usu.edu/etd/7430.

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Like many ranchers in the West, ranchers in West-Central Colorado are reevaluating their management strategies in the face of forces like drought, rising land prices, and encroaching development. While ranchers seek answers on alternative management strategies, research and Extension personnel search for adequate means of diffusing needed information. Relative to many rural western communities, ranchers in West-Central Colorado show high interest in alternative range management ideas, and many implement changes to their ranch management based on these ideas. This can partially be attributed to
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36

Tolleson, Douglas R. "An Easy to Use System for Developing a Drought Management Contingency Plan." College of Agriculture, University of Arizona (Tucson, AZ), 2016. http://hdl.handle.net/10150/625418.

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37

Braddick, Lynda. "'We don't go to the casino but we're the biggest gamblers in the world': drivers of change in the Mt Magnet and Upper Gascoyne regions." Thesis, Braddick, Lynda (2006) 'We don't go to the casino but we're the biggest gamblers in the world': drivers of change in the Mt Magnet and Upper Gascoyne regions. Masters by Research thesis, Murdoch University, 2006. https://researchrepository.murdoch.edu.au/id/eprint/431/.

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This thesis examines the complex environmental, social, economic and political challenges surrounding sustainable land use of rangelands by European leaseholders in Western Australia. A study of historical, socio-economic and technological events, combined with the development of social values and policy, exposed a broad suite of factors that shaped pastoralism and grazing, and continues to influence development in these regions today. The thesis also explained how the emergence of the sustainable development paradigm is raising awareness of the ways societies define the issues of development,
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Braddick, Lynda. "'We don't go to the casino but we're the biggest gamblers in the world' : drivers of change in the Mt Magnet and Upper Gascoyne regions /." Braddick, Lynda (2006) 'We don't go to the casino but we're the biggest gamblers in the world': drivers of change in the Mt Magnet and Upper Gascoyne regions. Masters by Research thesis, Murdoch University, 2006. http://researchrepository.murdoch.edu.au/431/.

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This thesis examines the complex environmental, social, economic and political challenges surrounding sustainable land use of rangelands by European leaseholders in Western Australia. A study of historical, socio-economic and technological events, combined with the development of social values and policy, exposed a broad suite of factors that shaped pastoralism and grazing, and continues to influence development in these regions today. The thesis also explained how the emergence of the sustainable development paradigm is raising awareness of the ways societies define the issues of development,
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Miller, Ryan Craig. "A rangeland watershed management spatial decision support system: Design, implementation, and sensitivity analysis." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280563.

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A prototype spatial decision support system for rangeland watershed management was developed to simplify the process of incorporating advances in technology into the decision process. The application utilizes an open framework by using Web services that are components that communicate using text-based messages, thus eliminating proprietary protocols. This new framework provides an extensible, accessible, and interoperable approach for spatial decision support systems. An important input into the SDSS is digital elevation data where data are produced using different methods, and with different
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Sebastian, Derek James. "Influence of soil properties and soil moisture on the efficacy of indaziflam and flumioxazin on Kochia scoparia." Thesis, Colorado State University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1590627.

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<p> Indaziflam and flumioxazin are two broad spectrum preemergence herbicides both labeled for control of kochia (<i>Kochia scoparia</i> L.). There is currently limited understanding of the significant effect of soil properties and soil moisture on the efficacy of these herbicides. Soil water retention curves were generated for soils with a wide range of soil physicochemical properties. The direct effect of soil moisture was then evaluated in a greenhouse bioassay. The dose required for 80 percent growth reduction (GR80) for both herbicides showed correlations with percent organic matter a
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Fotouo, Makouate Helene. "Dispersal strategies in communal versus privately-owned rangeland in Namaqualand, South Africa." Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-01282009-155013.

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42

Jernigan, Marcus Brendon. "Use of uprooted invasive buffelgrass (Pennisetum ciliare ) parent plants as thatch to reduce progeny seedling emergence." Thesis, The University of Arizona, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1550441.

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<p> Buffelgrass (<i>Pennisetum ciliare</i>) is a perennial bunchgrass native to Africa that has invaded ecologically intact areas of the Sonoran Desert in southern Arizona. It threatens many native plant species by means of competitive exclusion as well as increased fire frequency and intensity. Since the 1990s, efforts have been underway in southern Arizona to control buffelgrass using manual removal. A problem with this method is that the resulting bare, disturbed soil provides a favorable environment for buffelgrass seed germination. This study examined whether thatch composed of uprooted b
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Khalifa, Hamdy Elhoussainy Mohammed. "Modeling coupled heat and moisture flow within a bare desert soil." Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185882.

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Revegetation of semi-desert rangeland is dependent on rainfall, weather, and soil factors affecting seed germination and seedling establishment. To aid in predicting seed zone temperature and moisture following rainfall, a weather driven one-dimensional computer model was developed to simulate the simultaneous flow of heat and water within a bare semi-desert soil. The Newton-Raphson method was used to solve the surface energy budget equation for surface temperature. The coupled soil heat and water flow equations were then solved numerically using the weighted average finite-difference method t
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44

Anable, Michael Edward 1965. "Alien plant invasion in relation to site characteristics and disturbance: Eragrostic lehmanniana on the Santa Rita Experimental Range, Arizona, 1937-1989." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/277285.

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Presence and composition of Eragrostis Lehmanniana was measured on 75 permanent transects every 3-8 years between 1958-1989 on the Santa Rita Experimental Range, Arizona. The number of transects occupied and average composition increased rapidly over this period. A repeated measures analysis of two soil groups with different water holding capacity and permeability revealed that the rate of increase of E. Lehmanniana was different between the groups. Repeated measures analysis of five grazing intensities revealed that the rate of E. Lehmanniana increase was different among intensities. It appea
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Van, Deren Kurt Jon 1964. "The influence of invasive Lehmann lovegrass on two native grasses in the semi-desert grassland." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/278315.

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This study evaluated the influence of Lehmann lovegrass (Eragrostis lehmanniana Nees) on the densities and spatial distributions relative to mesquite (Prosopis velutina Woot.) of two native grasses, Arizona cottontop (Digitaria californica (Benth.) Henr.) and Rothrock grama (Bouteloua rothrockii Vasey), in the semi-desert grassland. Also evaluated were the affects of independent variables range site, elevation, and proportion mesquite cover on these relationships. General Linear Model analyses showed no association between Lehmann lovegrass and either the densities or the distributions of the
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46

Rogstad, Kristin Alix 1972. "Emergence and cool-season growth of Lehmann lovegrass and Arizona cottontop on different soils." Thesis, The University of Arizona, 1998. http://hdl.handle.net/10150/278673.

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Lehmann lovegrass (Eragrostis lehmanniana Nees.), a perennial bunchgrass, has established itself well since its introduction from South Africa. Arizona cottontop (Digitaria californica (Benth.) Henr.) is a native perennial bunchgrass that sometimes appears on the same sites and soils as Lehmann lovegrass. In a greenhouse, emergence was evaluated using line-source irrigation which simulated natural summer precipitation on two soil types collected from the Santa Rita Experimental Range (SRER). Density and cool-season growth of each species were monitored along transects located at the SRER on th
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Al-Haratani, Eisa Ramadan 1958. "Impacts of modernization on nomads and their use of rangeland resources in At-Taysiyah region, Saudi Arabia." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282288.

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Pastoral nomadism in arid and semiarid regions has evolved over many centuries as a rational response to uncertain climatic conditions and fragile ecosystems. Nomads are the main inhabitants of the bast area of marginal rangeland in Saudi Arabia. However, in the past few decades, modernization, in the form of improved transportation and access to water, combined with government subsidy of supplemental barley to the nomads of regions such as At-Taisyiah in the northern part of Saudi Arabia have provided the nomadic tribes with a buffer against uncertain climatic conditions and against the conse
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Mehramiz, Mohammad Reza. "Nutrient contents of three Atriplex species (Atriplex cancensces, atriplex linearis and Atriplex polycarpa) under different management practices and site conditions." Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/282667.

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There are thousands hectares of abandoned farmlands in Arizona. Research on practical methods for establishing native plants and wildlife on abandoned farmlands is under way at the Desert Botanical Garden of Phoenix and the University of Arizona. This research is aimed at improving understanding of the primary variables affecting restoration of abandoned farmlands. These variables include: water treatments, planting dates, mulch and water catchment, seasonal planting and plant species composition. The objectives of the study is to investigate the effect of land restoration practices on nitroge
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Watson, Mary Carolyn 1949. "Establishment of native Atriplex species evaluated under a line-source sprinkler irrigation system during the summer and winter." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/283996.

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Atriplex canescens (Pursh) Nutt., Atriplex polycarpa (Torr.) Wats., and Atriplex lentiformis (Torr). Wats. have been considered candidate perennial shrubs for revegetation of abandoned farmlands in southern Arizona. Objectives of the 1992-1994 field studies were to investigate the establishment characteristics of populations of these species and to estimate water requirements for establishing transplants and/or seedlings under a line-source sprinkler irrigation system. During the summer on a sandy loam soil, seedling establishment occurred at total water amounts greater than 200 mm but was ab
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Johnson, Roxane Jeannette. "Effects of fire on Agave palmeri." Thesis, The University of Arizona, 2001. http://hdl.handle.net/10150/291511.

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I investigated the effects of prescribed fire on Agave palmeri , an important seasonal food source of the federally Endangered bat, Leptonycteris curasoae yerbabuenae. Three different treatments were randomly assigned to plots containing agaves within a burn unit: plots were burned with extant fuel, plots were left unburned, and plots were burned with an augmentation of fuel. Agaves were surveyed before the fires, immediately after the fires, and one and two years after the fires. Mortality and survivorship with the fuel load, agave size and the type of clusters in which the agaves grew. Agav
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