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 12 of 12 for “"hummock"”.
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Runoff from hummock-covered Arctic tundra hillslopes in the continuous permafrost zone
Runoff processes at three hummock-covered hillslopes within a 95 ha catchment (Siksik Creek) in the tundra region of the Canadian western Arctic were studied for three years (1992-1994). Measurements over the study included all hydrological inputs, monitoring of active layer and water table depths, …
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Sediment Transport and Wind Flow Around Hummocks
… shear stress and sediment transport surrounding hummocks, a type of small dune. While qualitative observations and holistic, large-scale experiments regarding vegetation density and sediment transport have confirmed a negative correlation, fewer papers have quantitatively described the nature of …
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Shrub expansion in the low Arctic: The influence of snow and vegetation feedbacks on nitrogen cycling
… snow plots (using snowfences) in low birch hummock tundra, and to tall birch-dominated plots near Daring Lake, N.W.T. in the Canadian low Arctic. The first study (Chapter 2) characterizes soil 15nitrogen cycling over a single winter to investigate if experimentally deepened snow in low birch …
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Testing the late-Holocene climate signal from ombrotrophic bogs in southernmost Chile and the Falkland Islands: a multi-proxy, multi-profile and multi-site approach
… between proxies were evident. KAR-EM-1, the low-hummock profile, displayed the highest number of significant correlations, suggesting an optimal coring location. Chronological uncertainty in the high-hummock profile, KAR-EM-3, was the focus of discussion. Intra-site replicability between the …
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Factors associated with Atlantic white -cedar seedling recruitment on microtopographic and landscape scales, Brown Mill Pond, Rye, New Hampshire
… showed that cedar seedlings were (1) absent from hummocks with tussock sedge substrate and present on hummocks with moss or litter substrate, (2) most frequent 10--25 cm above the July water table, at "intermediate" elevations, and were less common between 25--60 cm on these …
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Movement patterns and habitat use by Namib golden moles (Eremitalpa granti namibensis Bauer and Neithammer, 1959)
… of prey resources namely, vegetation hummocks and dune slip faces. I further predicted that movement patterns would show seasonal variation linked to changes in ambient and sand surface temperatures. I followed mole tracks in the early morning for 3 to 14 consecutive days each month at …
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Vegetation and Soil Patterns at a Mountain Wetland Ecotone
… and that trees are likely to be growing on hummock features and within tree islands. Soil properties resulted in mixed conclusions. The aerial photograph assessment revealed that trees and alders have been steadily encroaching into the open peatlands for at least the past 52 years. The …
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Root-zone soil temperature: sources of variation and some effects on planted conifer seedlings in high-elevation forest openings in the interior of British Columbia
… the influence of microtopography (presence of a hummock, average dimensions of 1.0m x 1.0 m x 0.4 m) on soil temperature was significant, measurements of micro-slope and micro-aspect showed little if any association with variation in soil temperature. Microsites associated with suboptimally low …
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From Genes to Traits and Ecosystems: Evolutionary Ecology of <i>Sphagnum</i> (Peat Moss)
… wherein some species produce hummocks raised up to a meter above the water table, while others live in hollows at or near the water table. However, it is unclear how these traits evolved during <i>Sphagnum</i> diversification, to what extent natural selection produced …
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Robustness and precision of Holocene palaeoclimatic records from peatlands using testate amoebae
… to have been the location of an insensitive hummock over much of the period of accumulation. At the meso-scale (100-1000m), between the central mire expanse and the mire margins, synchronous changes can be identified, but the edges generally have lower water tables than the central portions …
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Developing a trait-based approach to understand <i>Sphagna</i> responses to hydrological stress in the Flow Country
… and water-holding capacity consistent with their hummock–lawn–pool strategies. Intraspecific trait differences among sites were generally small and inconsistently related to coarse climatic or edaphic variables, indicating trait conservatism at regional scales. At a finer spatial scale, a …
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Spatial and temporal patterns (1973-2012) of bushfire in an arid to semi-arid region of Western Australia
… most extensively in the southern study area and Hummock grassland (68%) in the northern. The northern study area had a greater variety of vegetation groups that burnt than the southern area (northern — 37; southern — 22). The Acacia Shrubland vegetation group contained the greatest number of fire …