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 254 for “"aboveground"”.
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Estimating Aboveground Biomass (AGB) Throughout the Pacific
Aboveground biomass (AGB) is a significant carbon pool in forests, making AGB a good indicator of forest health and carbon storage. AGB has been studied on multiple scales, in which allometric equations were developed to find relationships between AGB and tree parameters. However, despite the …
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Tradeoffs Between Aboveground and Soil Carbon Accumulation Following Forestation
… trees sequester large amounts of carbon in their aboveground biomass. However, there is emerging evidence that under some conditions, soil carbon decreases following forestation, offsetting the carbon accumulated aboveground and rendering carbon sequestration efforts ineffective. The factors …
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Effects of Growth Environment on Aboveground Carbon Budgets in Ponderosa Pine
In a separate study I measured ponderosa pine saplings grown in CO$\sb2$-enriched atmospheres. Trees grown under elevated CO$\sb2$ concentrations (ambient + 350 ppm) had higher temperature coefficients of respiration than trees grown under current ambient concentrations (approx. 350 ppm) and this …
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Below- and aboveground farmland biodiversity in relation to local and regional management
Die Ausdehnung von Ackerland, Plantagen und Weideland in den letzten Jahrzehnten sowie die Intensivierung der Landwirtschaft auf lokaler und regionaler Ebene sind Hauptgründe für den Biodiversitätsverlust. Intensivierung auf lokaler Ebene ist durch einen vermehrten Einsatz von Maschinen, Spritz- …
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Bottom-up effects of aboveground biota, invasive species and drought on soil animal communities
Soil ecosystems are facing the threat of a growing human population and the consequent global changes. Soil food webs are being exposed to unprecedented levels of disturbance, with the potential to disrupt the regulating interactions between soil biota components, and the role these components play …
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Aboveground effects of variation in the legume-rhizobium mutualism on insect herbivore Spodoptera exigua
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Remote sensing of dynamics and aboveground biomass of seagrass in Tauranga Harbor (Bay of Plenty), New Zealand
… and SAR data was developed for seagrass aboveground biomass (AGB) estimation. Optimal results were obtained using a combination of ML methods and metaheuristic optimization. The seagrass distribution was mapped at an accuracy over 90% using the Extreme Gradient Boost (XGB) whilst the AGB …
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Restoration implications of land management on aboveground vegetation and seed bank composition of grassland communities in Illinois
… 4) determine if the seed banks will reflect aboveground species composition; and 5) determine if seed banks can impact restoration success. In 2009, vegetation surveys and soil cores were collected in July and October, respectively, for a total of 30 sites (five sites per land history) and …
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Mathematical Models of <i>Zea mays</i>: Grain Yield and Aboveground Biomass Applied to Ear Flex and within Row Spacing Variability
… the Duncan grain yield model, the Russell aboveground biomass model, and to study the effect of inconsistent spacing within rows on Zea mays L. yield. Plant spacing other than uniform decreases grain yield and profitability. The population experiments conducted at the Warren County location …
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Soybean response to elevated ozone and reduced precipitation is dominated by aboveground responses to ozone and belowground responses to soil drying
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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An Object-Oriented Approach to Forest Volume and Aboveground Biomass Modeling using Small-Footprint Lidar Data for Segmentation, Estimation, and Classification
This study assessed the utility of an object-oriented approach to deciduous and coniferous forest volume and above ground biomass estimation, based solely on small-footprint, multiple return lidar data. The study area is located in Appomattox Buckingham State Forest in the Piedmont physiographic …
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Effects of Altered Growing Season Precipitation and Management History on Aboveground Biomass Production in Tallgrass and Mixed Grass Prairie of South Dakota
… used to measure resistance in 2014 and 2015 of aboveground biomass in two contrasting plant communities (high productivity/high diversity, low productivity/low diversity) on three ranches (Oacoma, Highmore, and White River) in mixed grass prairie of SD. Tallgrass prairie precipitation …
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Interaction of tomato plants infected by the nematode Meloidogyne javanica on aboveground herbivore Tetranychus urticae and on behaviour of its predator Phytoseiulus macropilis
… is affected and, consequently, the performanceof aboveground herbivores. The attraction of more predators to plants with nematode infestation increased after 24 hours, which may have varied the number of females that oviposited in this treatment. Thus, it is important to understand the effect on …
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Projecting Carbon Pools in Aboveground Woody Accumulations and Harvested Wood in Loblolly Pine Plantations of the Southern United States: From Stand-level to Regional Scales
… the next half-century, both in terms of in-woods aboveground carbon pools and harvested products, including wood used for energy production. A region-wide data set from the Forest Inventory Analysis (FIA) program of USDA Forest Service was used to set initial conditions and estimate model …
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Effects of drought on the growth of young and mature temperate forests in West Virginia
… of this study was to determine the variation in aboveground production between two different aged forest stands and to evaluate the effect of drought on inter-annual variation in productivity. Aboveground net primary production (ANPP) was compared with precipitation and the Palmer Drought …
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Aboveground woody biomass estimation of green ash trees (Fraxinus pennsylvanica Marsh.) along Colorado's Northern Front Range in response to the invasive emerald ash borer (Agrilus plannipenis Fairmaire)
… whether these equations can accurately predict aboveground woody biomass of green ash trees removed as part of emerald ash borer mitigation efforts in urban areas of Colorado's Northern Front Range. Data from 42 destructively sampled ash trees removed from 11 sites as part of emerald ash borer …
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Impact of nutrient heterogeneity on plant response and competition in Coastal plain species
… proliferation in rich patches (precision) and aboveground biomass response to heterogeneity were assessed in monocultures, and competitive outcomes (aboveground biomass) were determined from mixed-species plots. In monoculture plots, two species were relatively precise foragers, but no species …
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The Investigation of the Soil Seedbank in a Long-term Mowing and Fertilization Experiment
… hydrology can all have negative effects on aboveground vegetation, such as a decrease in biodiversity. However, little is known about the effects of these factors on seedbanks. Here I investigated how fertilization, drainage, and disturbance (mowing) have affected the seedbank community in a …
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Species and functional diversity effects on productivity and nutrient uptake: implications for designing sustainable agricultural systems in the Midwest
<p>Temporal data on aboveground biomass and nutrient uptake by species and functionally diverse native perennial plant species and communities is needed to enhance the performance of in-field buffer conservation practices. Comparisons on the performance of monocultures and polycultures of four …
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