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 63 for “"chronosequence"”.
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Chronosequence studies of ecosystem development of Leymus arenarius dunes in Iceland
Sandhólasvæði, sem hér á landi eru einkum melhólar eða mellönd, eru kvik vistkerfi með stöðugu áfoki sands. Sambærileg vistkerfi er að finna um allan heim, frá hásléttum meginlandanna, áraurum til fjörusanda. Þau eru umfangsmikil á Íslandi en hér er að finna yfir 22.000 km2 af sandauðnum, allt frá …
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Floristic dynamics of Appalachian pine-oak forests over a prescribed fire chronosequence
… George Washington National Forest representing a chronosequence of conditions since burning: pre-burn, and 1, 2 and 12 years post-treatment. Vegetation structure was more affected by environmental and spatial (burn intensity) gradients than by time since burning. Significant fire effects occurred …
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Patterns, Processes And Models Of Microbial Recovery In A Chronosequence Following Reforestation Of Reclaimed Mine Soils
… of mining sites of different ages facilitate a chronosequence approach for studying decades-long microbial community change, which could help generalize theories about ecosystem succession. In this study, the recovery of microbial communities in a chronosequence of reclaimed mine sites spanning …
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AVIAN COMMUNITIES MONITORED ALONG A SUCCESSIONAL CHRONOSEQUENCE IN BOTTOMLAND HARDWOOD FORESTS IN THE LOWER MISSISSIPPI ALLUVIAL VALLEY
… Mississippi Alluvial Valley along a successional chronosequence. Birds were sampled using automated recording units over 10 days across 149 sites for the breeding bird seasons of 2021 and 2022. Sites were categorized into one of eight forest classes based on age and time since silviculture …
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The Role of Nitrogen Availability, Hydroperiod and Litter Quality in Root Decomposition Along a Barrier Island Chronosequence
… Atlantic Coast barrier island dune and swale chronosequence (Virginia Coast Reserve Long Term Ecological Research site), addressed how hydroperiod, litter quality and nitrogen availability influenced below ground root decay in response to gradients associated with site age and topographic …
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Canopy structural and meteorological influences on CO2 exchange for MODIS product validation in a boreal jack pine chronosequence
… within a previously disturbed boreal jack pine chronosequence located in Saskatchewan, Canada and then to apply this understanding to evaluate low resolution remote sensing data products from the Moderate Resolution Imaging Spectroradiometer (MODIS) using airborne lidar. The first objective of …
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Characterizing Hydrological Balance and Hydrochemistry of a Chronosequence of Newly Formed Wetlands within the Athabasca Oil Sands Region using Isotopic and Geochemical Tracers
… Boreal Wetland Reclamation Assessment Program, a chronosequence study design was used to infer the trends in water balance and geochemistry of 80 wetlands aged 2 to 40 years and varying in hydroperiod, salinity, and degree of riparian disturbance. Half of the wetlands were in reclamation …
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A study on above- and belowground biomass and carbon stocks as well as sequestration of mountain birch (Betula pubescens Ehrh.) along a chronosequence in southern Iceland
… and organic carbon is accumulated along a chronosequence in South Iceland and how afforested and remnant mountain birch areas react as carbon sinks. In summer 2009, 31 monocormic trees (0.1-5.5 m height) were measured and excavated. The excavated trees formed the dataset to establish …
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Community and ecosystem analysis of forests recovering from landslide disturbance: White Mountain National Forest, New Hampshire
… compares historical data collected in 1956 on a chronosequence of landslides in the White Mountain National Forest to data collected 40 years later. Detrended correspondence analysis is used to determine the major driving variables of succession during the two sample periods. The 1956 dataset …
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Selective accrual and dynamics of proteinaceous compounds during pedogenesis: testing source and sink selection hypotheses
… of change in the amino acids in a 4000 year-chronosequence adjacent to Lake Michigan, USA (Michigan chronosequence) and they were tightly related to the shifts in their biological sources, namely aboveground vegetative community (r2=0.66, p<0.0001) and belowground microbial community …
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Soil and vegetation recovery on abandoned paved roads in a humid tropical rain forest, Puerto Rico
… soil and vegetation characteristics on a 60 yr chronosequence of abandoned paved roads in Puerto Rico. Rapid recovery obscured successional changes in soil regeneration. Littermass, bulk density, soil moisture, soil organic matter, and total Kjeldahl nitrogen reached forest levels within 11 yr …
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When do propagules matter? The role of ecological filters and regeneration dynamics during community assembly in tallgrass prairie restorations
… and bud banks were quantified across an 11-year chronosequence of restored prairies and in prairie remnants to elucidate the degree to which the germinable seed bank, emerged seedlings, belowground buds, and emerged ramets were related to community regeneration. There were no directional patterns …
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The effectiveness of actively accumulating dust in rejuvenating soils and ecosystems in a super-humid, high weathering and leaching environment, West Coast, South Island, New Zealand
… two environmental gradients, a dust-free chronosequence (170 to 6500 y) and a dust accumulation gradient on a 6500 y old surface (28 g m⁻² y⁻¹ to zero), located on the super-humid West Coast of the South Island, New Zealand. Across both gradients, soils were analysed for indicators of …
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Decomposition Dynamics in Restored and Naturally Recovering Atlantic White Cedar (<i>Chamaecyparis thyoides</i>) Wetlands
… setting compared to the stands along a chronosequence. In contrast, <em>Chamaecyparis</em> root decay was similar along the chronosequence and restoration setting. Native leaf litter decay was faster than <em>Chamaecyparis</em> leaf litter decay but no differences occurred among litter …
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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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The effects of bog restoration in formerly afforested peatlands on water quality and aquatic carbon fluxes
… also investigated restoration progress across a chronosequence of restoration sites using pore- and surface-water chemistry.<br/>Our results showed significant increases in DOC, phosphate, K and NH4+ (2-99 fold) in pore- and surface- water in the first year post-restoration, which may have …
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Earthworm dynamics in tallgrass prairies in the Ozark Highlands region of northwest Arkansas
… density in a native prairie remnant and a chronosequence of three prairie restorations (i.e., 1979, 2000, and 2002), and iii) to identify relationships between earthworm density (i.e., juvenile, adult, and total) and soil physical and chemical properties in the upper 20-cm of soil across …
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An assessment of the representation of fire severity and coarse woody debris dynamics in an ecosystem management model
… of model development. Data were collected from a chronosequence of fire affected sites in the MSdm subzone of the TFL 49 Kelowna. The ability of the FORECAST model to simulate accumulation patterns in CWD and soil organic matter and nitrogen following fire was tested by comparing model outputs …
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Morphology and development of the Red Rock Canyon alluvial fan, Clark County, Nevada
… accumulation establish relative ages of a chronosequence of calcic soils and pedogenic calcretes that underlie four surfaces identified on the Red Rock Canyon alluvial fan. All surfaces identified are formed of limestone alluvium, occur at elevations of 853 m, and share the same climate and …
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Vegetation community change over decadal and century scales in the North Carolina piedmont
… States Piedmont forests has been assumed from chronosequence studies over the last half century. However, these assumptions for forest understory herb-layer populations and communities have not been tested using long term data sets. Using permanently marked plots in the Duke Forest (Durham, NC, …
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