Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Tree line"”.
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Soil Amino Acids at Upper Tree Line, Montane and Lower Tree Line
… plant available N in alpine, montane and lower tree line soils in the Colorado Front Range. Soils were sampled in forest and non-forest at three sites with varying temperatures and productivity. Some species in the dominant genera at each site, <em>Kobresia</em>, <em>Artemisia</em>, …
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Holocene variations in summer temperature and effective moisture: Understanding the causes of vegetational dynamics in Alaska
Arctic tree-line response to 21st century warming is an important positive feedback mechanisms that can facilitate further tree line advance and amplify changes to the global heat budget through changes in the planetary albedo and effects on soil carbon pools. However, responses of the …
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SPATIAL VARIABILITY IN SPECIES COMPOSITION IN NEOTROPICAL MONTANE TREE COMMUNITIES
… across the elevational gradient and at tree line. Thirty –six 0.1–ha tree plots were installed (1) along three different elevational transects in tropical montane cloud forest (TMCF) between 1500 and 3600 m and (2) across a ∼ 40 km landscape transect near tree line above …
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Holocene environmental change in the Scottish Highlands: multi-proxy evidence from blanket peats
… for pine woodland density variations and tree-line dynamics. The evidence is derived from the biostratigraphy of of peat profiles sampled along altitudinal transects in the two upland areas of Gleann Einich in the Cairngorms (between c.500m OD and 930m OD) and Beinn Dearg in the Northwest …
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Periglacial Geomorphological Mapping of the Comanche Peak Area . Mummy Range, Larimer County, Colorado
… Colorado. Most of the mapped area lies above tree line in the alpine environment, about 10,400 ft. (3120 m). Krommholz, salix , grasses, sedge, and a variety of wild flowers are the dominant vegetation. All landforms are developed in Precambrian granites, gneiss, and schist of Precambrian X …
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Assessing natural and management-induced patterns of herbicide sorption and risks in catchments: a soil landscape modeling approach.
… varied significantly between alley and tree line regions and among different establishment ages of the orchard trees. Unique spatial patterns for soil properties, particularly total organic carbon (TOC), occurred within zones of the orchard. The variability in spatial distribution of the …
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Murky waters: discerning among sources of natural variation under high uncertainty and at multiple scales
… on allochthony, but add that it sharply declines at high elevation due to changes in terrestrial primary production near or above tree line. I also found that primarily rain-fed rivers undergo large seasonal temperature fluctuations that closely track air temperature – high coupling – while …
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Variación geográfica de la distribución altitudinal de Kageneckia angustifolia (D.Don): Uso de Google Earth como herramienta de muestreo
The treeline corresponds to the altitude that marks the separation between two vegetational formations: Native forest and alpine vegetation, with the temperature the main factor that explains this transition zone. Because de latitudinal variation of temperature, the altitude that define the …
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Evaluating Columbus, Georgia, Tree Canopy Interactions with Air Pollutants Using High Spectral Imagery and Portable PM Sensors
<p>Trees provide environmental, economic, and social advantages in urban areas. Knowing the extent and location of tree canopy in a municipality is an important step in quantifying these benefits. Spatial and temporal tree canopy analysis was performed for the city of Columbus, Georgia, by …
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Limitations of savanna trees in the highveld grasslands of South Africa
… It is puzzling that fire-tolerant savanna trees do not grow in these grasslands. The Highveld grasslands of South Africa are one such grassland. Hypotheses including fire, human intervention, grass competition and various attributes of soil have been proposed to explain the tree-less nature …
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A physiological basis to crop improvement and agronomic development
… in wheat; (ii) determinants of increased HI in lines with different Rht genes (b, c) when incorporated into contrasting background wheat genomes (B, D), and the relative effect on N partitioning during grain filling; (iii) analyses of stable isotopes (δ²H, δ¹⁸O, δ¹⁵N and δ¹³C) in an agronomic …