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 9 of 9 for “"Volcanic soils"”.
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Microbial Diversity in Young Volcanic Soils
… responses to changing climate. Icelandic soils have characteristics allowing for unique studies of soil formation and carbon respiration, but has been little studied with regard to microbial communities. Analysis of the distribution of 16S and 18S rRNA genes from bacteria and eukaryotes …
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A comparative study of vascular plants associated with Allium tribracteatum Torrey and Allium obtusum Lemmon, with special consideration of the flora of the Mehrten Formation, Tuolumne and Calaveras Counties, California
… is restricted or nearly restricted to volcanic soils of the Mehrten Formation in Tuolumne County, California and is a species of concern to the United States Forest Service because of this restricted distribution. Allium obtusum, on the other hand, is found both on the Mehrten Formation …
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The role of ecological barriers in the development of cultural boundaries during the later Holocene of the central Alaska peninsula
"This study assesses the capability of very large volcanic eruptions to effect widespread ecological and cultural change. It focuses on the proximal and distal effects of the Aniakchak volcanic eruption that took place approximately 3400 rcy BP on the central Alaskan Peninsula. The research is …
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Uppfrysning i skogplanteringar på Island - en litteraturstutie med problemskrivning och åtgärdsförslag
… grazing in conjunction with highly erodible volcanic soils and harsh climate combined with big need for fuel wood. The Icelandic reforestation efforts reached an all time high in 1990-2000 when the state started to give economic assistance to different forestry projects. At that time …
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Clay Mineralogy and Organic Carbon Associations in Two Adjacent Watersheds, New Zealand
… mineral compositions from specimens of bedrock, volcanic soils and tephras, suspended river sediment, and recent marine sediments were studied. Identification of the clay minerals was made chiefly by X-ray (XRD), infrared (FTIR), and selective mineral dissolution analyses. Geochemical analyses …
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Variability of physical, chemical and hydraulic parameters in soils of Mt. Kilimanjaro across different land uses
The heterogeneity of soils is a key to biological processes, carbon turnover and water storage. Climate change and anthropogenic land use changes often decrease important functioning of soil systems. In order to understand the soil complexity, sophisticated technologies to measure soil properties …
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Estimating Sediment Losses Generated from Highway Cut and Fill Slopes in the Lake Tahoe Basin
… In terms of broad comparisons, the slopes with volcanic soils (sandy loams) typically generated greater amounts of runoff and erosion than the slopes with granitic soils (sand and loamy sands) and exhibited finer particle size fractions in the bulk soil and runoff, resulting in four to ten times …
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Major and trace element characterization and correlation of the Sentinel Butte Ash/Bentonite (Paleocene), McKenzie County, North Dakota
<p> The Sentinel Butte ash/bentonite has been used for stratigraphic correlation in and around the North Unit of Theodore Roosevelt National Park in western North Dakota primarily by tracing it along the escarpments of the Little Missouri River. The purpose of this study was to determine the …