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 10 of 10 for “"chronosequences"”.
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Community and ecosystem changes in tallgrass prairie restorations: the effects of population source and diversity
… restoration. Two field experiments, and two chronosequences were used to investigate this main objective. The two field experiments were established at the same latitude separated by 620 km (corresponding to a precipitation gradient from eastern Kansas to western Illinois), and consisted of a …
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A comparative study of the seed bank dynamics of two congeneric alien invasive species
… sampled in an earlier study, or sites providing chronosequences of clearing dates. Concurrently, a demographic study of the species' seed banks, including processes from seed rain through to seedling emergence and survival, was done in dense Acacia stands and in fynbos vegetation. Acacia saligma …
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Assessing the effects of grazing and land use change on soil carbon stocks in pastures of the Virginia Blue Ridge
… measures) conflicted with the results of the chronosequences that we collected in 1999 and 2010. This conflict should serve as a cautionary tale to ecologists using space-for-time substitution. Averaged across all sites (all of which are grazed), we found soil carbon in the top 20 cm of soil …
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Development and assessment of remotely derived variables in current southern pine beetle (Dendroctonus frontalis Zimm.) hazard mapping in North Carolina, USA
… current Landsat 5 Thematic Mapper (TM) imagery chronosequences of disturbance index (DI) â transformed scenes to identify stand-replacing disturbances, resulting in a kappa statistic of 0.6364 for the younger than 22 year age class and 0.7778 for the older than 22 years age class. A kappa value …
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Selective accrual and dynamics of proteinaceous compounds during pedogenesis: testing source and sink selection hypotheses
… chronosequence. Common trends between two chronosequences suggested that either polar interactions or redox reactions may be relatively more important in the mineral interaction of amino acids than non-polar interactions. The consistency of results at two disparate locations in the southern …
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Plant Successional Patterns at Sperry Glacier Foreland, Glacier National Park, MT, USA
… opportunity to study succession across the chronosequences of glacier forelands. Patterns of plant colonization and succession on terrain exposed by retreating glaciers give insight into factors influencing alpine ecosystem change and recovery. Understanding these patterns and processes is …
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Changes in δ¹⁵N in pastoral soils under varying management intensity
… ing δ¹⁵N in soils from four forest-to-pasture chronosequences, and in archived soils from six long-term (4–57 year) grazed field trials with different fertiliser or irrigation regimes. Three of the forest-to-pasture chronosequences were on pumice soils where pine forests had been converted to …
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Post-management vegetation change in upland heather moorland, with particular reference to the nutrient status of soils : Lake Vyrnwy Estate, Powys, Mid Wales
… management regimes were used as the elements of chronosequences, which were utilised to investigate vegetation change over time in relation to particular management treatments. Vegetation was described from quadrats located within this framework and quadrat-specific soil samples were taken for …
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A study of forest ecosystem development
This study was made in order to elucidate, quantitatively, the changes taking place with time in a relatively simple ecosystem of Pinus radiata D. Don. on skeletal soils and integrades to Yellow-Brown Sands. Every endeavour was made to keep other soil forming factors (and the influence of other …
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Soil chemistry and ecology on a restoration trajectory of a coastal sandplain forest, Punakaiki, New Zealand
This research was carried out in order to better understand the interactive role of vegetation and soil biogeochemistry on an ecological restoration trajectory on the West Coast of New Zealand. The Punakaiki Coastal Restoration Project (PCRP) was developed to restore degraded land to a more natural …