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 20 of 386 for “"grasslands"”.
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Transkei grasslands : recent phenomenon or ancient?
… been transformed by the Iron Age Farmers to grasslands. Feely (1985) suggested that the grasslands are ancient. I therefore used C isotope analysis to reveal whether there has been any change in the dominant vegetation during the Iron Age period. We measured the δ¹³C value of the soil organic …
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Syntaxonomy and synecology of western Transvaal grasslands
… vegetation types within the western Transvaal grasslands. A new procedure was used to compile a synecological and syntaxonomical synthesis of the vegetation of the western Transvaal grasslands. By using land types as first stratification it presented an easily interpretable vegetationcum- …
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Floristics, Conservation, and Restoration of Virginia's Piedmont Grasslands
The native grasslands of Southeastern North America contain higher native plant diver- sity than the prairies of the Great Plains, but they have lost 90-99% of their historic range through disruption of their natural disturbance regimes and conversion to agricultural lands. To inform the …
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Controls on soil carbon accrual in restored perennial grasslands.
… on soil carbon accrual in restored perennial grasslands.
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The nitrogen cycle and ecohydrology of seasonally dry grasslands
This thesis addresses the coupling of hydrologic and biogeochemical processes and, specifically, the organization of ecosystem traits with the water, carbon, and nitrogen cycles. Observations from a factorial irrigation-fertilization experiment in a seasonally dry annual grassland are combined with …
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Surface Runoff Quality in Grasslands Fertilized with Broiler Litter
Surface application of broiler litter to grasslands can increase concentrations of ammonium (NH₄+-N) and dissolved reactive phosphorus (DRP) in surface runoff. It is not known, however, for how long after broiler litter applications that NH₄+-N and DRP concentrations remain elevated. Five 0.75-ha, …
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Intraspecific trait variation and community assembly in old-field grasslands
<p>Trait-based approaches are increasingly used in plant community ecology, but previous research has largely ignored functional trait variation within species. Here I investigated the role of intraspecific trait variation in community assembly and responses to spatial and temporal environmental …
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Analysis of archaeological settlement patterns in Grasslands National Park, Saskatchewan
… Park using Geographic Information Systems. Grasslands National Park is located in southwestern Saskatchewan along the international border and is split into West and East Blocks. The Park is primarily short grass prairie with the Frenchman River Valley running through the West Block and a …
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SEED PRODUCTION OF MIXED PRAIRIE IN GRASSLANDS NATIONAL PARK, SASKATCHEWAN
… on seed production. Study sites were located in Grasslands National Park in southwest Saskatchewan. Ripe seed was harvested from three community types corresponding with upland, slope, and lowland topographic positions at eight dates over the growing season in 1994 and 1995. Maximum standing crop …
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TRIBAL RESERVED RIGHTS ON REGION ONE NATIONAL FORESTS AND GRASSLANDS
… gather forest products from national forests and grasslands. As a result, divergent judicial opinions between the federal Ninth and Tenth Circuit Courts ensued, but tribes have been successful in settling three areas of law, which are: 1) tribal members can exercise rights free from state …
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TRIBAL RESERVED RIGHTS ON REGION ONE NATIONAL FORESTS AND GRASSLANDS
… gather forest products from national forests and grasslands. As a result, divergent judicial opinions between the federal Ninth and Tenth Circuit Courts ensued, but tribes have been successful in settling three areas of law, which are: 1) tribal members can exercise rights free from state …
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Exploring the mechanisms and impacts of plant invasions in grasslands
… or leaf %N across natural or nutrient enriched grasslands worldwide. Since these traits are indicative of plant growth strategies, this suggests successful native and non-native grassland species exhibit similar growth strategies. However, non-native species showed higher leaf %P and %K, along …
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Carbon storage in grasslands : the impact of atmospheric nitrogen pollution
… the chemical form of nitrogen may affect how grasslands respond to nitrogen enrichment. In addition, nitrogen has both direct and indirect (via plant community change) effects on carbon. In order to understand how nitrogen affects carbon storage, these different effects must be disentangled. …
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Effects of Plant Invasions on Birds Breeding In Desert Grasslands
… that once dominated desert and semidesert grasslands. These plant invasions have reduced the quantity and quality of habitat for many grassland-associated species, including grassland birds, which have declined more rapidly across North America than any other group of birds. Along gradients …
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Ecological Features of Bird Communities in South Texas Brush-Grasslands
Made available in DSpace on 2014-12-12T01:27:33Z (GMT). No. of bitstreams: 1 7121218.pdf: 4468440 bytes, checksum: 0de7c33997e3b9641793f1350c6403f9 (MD5) Previous issue date: 1971
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Long-term ecosystem dynamics of contrasting grasslands in South Africa
Rainfall, fire, and grazing all control changes in vegetation and soil in grassland and savanna ecosystems. In these ecosystems, wetlands are key resource areas because they keep moisture and collect nutrients that support grass production. The grass production supports high grazer densities in …
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Consequences of nutrient enrichment for soil organic matter cycling in grasslands
… C in the majority of biomes, especially grasslands. Consequently, either positive or negative changes to grassland soil C sequestration could feed back to influence the global C cycle. Unfortunately, the effects of nutrient enrichment on SOM cycling remain uncertain. In my dissertation, I …
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