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Responses to fertilizer nitrogen of rangelands at various elevations in the southern interior of British ColumbiaHall, Kenneth M. January 1971 (has links)
Nitrogen fertilization of grassland and forest range in British Columbia is examined as a practical means of increasing productivity. Trials were undertaken at several altitudes and responses were studied in fenced and unfenced plots over a period of two years. Four clipping times, three rates of ammonium nitrate application and two times of application were the major treatments at most sites. Information on climate and soil was also obtained and clipped forage was analyzed for nitrogen.
Increases in dry matter yield and combined nitrogen levels obtained on all sites despite the marked mid-season limitation of soil moisture; responses to autumn fertilization were evident in early growth in the spring following application; responses to spring application were delayed. Response to fertilizer has continued to be marked in the second year after application. Understory vegetation of the forest range responded to fertilization at first but by the second year, it appears, overstory vegetation (trees) was responding to the detriment of understory yield. / Land and Food Systems, Faculty of / Graduate
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Predicting semidesert range perennial grass production from recent precipitation and grazing levelsRivers, William James, January 1977 (has links) (PDF)
Thesis (M.S. - Renewable Natural Resources)--University of Arizona. / Includes bibliographical references.
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HALO-Based Research Conducted by the LIM: previous Campaigns and Plans for the FutureSchmidt, Jörg, Wendisch, Manfred, Wolf, Kevin, Ehrlich, André, Nitzsche, Gunda 13 November 2017 (has links)
This article gives an overview about the activities of the Leipzig Institute of Meteorology (LIM) within the HALO (High Altitude and Long Range Aircraft) Scientific Priority Program (SPP 1294 funded by DFG). HALO offers unique possibilities for atmospheric research and Earth observations. It can carry a scientific payload of up to 3 t, cover a range of 10000 km and reach a ceiling of 15 km. The LIM contributes to the instrumentation of HALO with the Spectral Modular Airborne Radiation measurement sysTem (SMART). SMART was deployed during the first HALO mission TECHNO in 2010. During subsequent five HALO campaigns SMART measurements provided valuable insights regarding cloud properties and the Earth’s radiative budget. Three further missions, which are scheduled for the coming years, will make use of SMART measurements as well. / Dieser Bericht gibt einen Überblick über die Aktivitäten des Leipziger Instituts für Meteorologie (LIM) im HALO Schwerpunktprogramm (SPP 1294 der DFG). HALO bietet einzigartige Möglichkeiten für die Atmosphärenforschung und Erdbeobachtung. Es kann eine wissenschaftliche Nutzlast von 3 t aufnehmen, eine Reichweite von 10000 km zurücklegen und eine maximale Flughöhe von 15 km erreichen. Das LIM trägt zur Instrumentierung von HALO mit dem Spectral Modular Airborne Radiation measurement sysTem (SMART) bei. SMART wurde 2010 bei der ersten HALO Mission TECHNO eingesetzt. In fünf folgenden HALO Kampagnen verschafften SMART Messungen wertvolle Erkenntnisse bezüglich Wolkeneigenschaften und dem Strahlungsbudget der Erde. Drei weitere HALO Missionen, die für die kommenden Jahre geplant sind, werden ebenfalls SMART nutzen.
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Ecology and conservation of prairie rattlesnakes (Crotalus viridis viridis) in relation to movement in a fragmented urban environmentAndrus, Wonnita, University of Lethbridge. Faculty of Arts and Science January 2010 (has links)
Eighteen prairie rattlesnakes (Crotalus viridis viridis) were tracked using radio-telemetry and 82
snakes were PIT-tagged over a 2-year period in Lethbridge, AB to determine population size,
movement patterns, and habitat utilization, and to predict fragmentation effects on the species
within an urban locale. Population size was estimated using closed population models at 374
snakes (295 adults) and open population models at 204 snakes (161 adults), greater than an
estimate of <50 adults in 2003 (Ernst, 2003) and 2006 (Ernst & Quinlan, 2006).
Mean home range sizes, based on 95% minimum convex polygon analysis, differed significantly
between years (31.51 ha in 2005, 3.72 ha in 2006). Calculated movement parameters, such as
mean distance moved per day, total distance moved over the course of the active season, and
frequency of movement varied between years and individuals. Greater-than-expected (under
hypotheses of even habitat choice) utilization was observed in habitat types located within coulee
and flood plain areas, with apparent preference towards unbroken parcels of grassland or
cottonwoods, whereas less-than-predicted utilization of agricultural habitat type was observed.
Fragmentation effects on prairie rattlesnake movement and occurrence were examined through
modeling and were found to coincide with observed species’ locations, suggesting that prairie
rattlesnakes are undergoing modification of movement patterns to avoid highly concentrated
human density or use. Influence of weather on the use of vegetative ground cover was observed,
as it was accessed more by prairie rattlesnakes at higher temperatures.
Recommendations towards future management of the prairie rattlesnake population in Lethbridge
are given, including protection of the Bridge View Drive site and inclusion of varied habitat types
and terrain when planning habitat and wildlife corridors. Management decisions that ensure
remaining habitat parcels and connective areas near rattlesnake foraging or movement corridors
are also advocated. Identification of future research focuses include studies on juvenile
survivorship, genetic structure, and vehicle-related mortality. / xii, 83 leaves : col. ill., col. maps ; 29 cm
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