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 76 for “"particulate organic matter"”.
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Quantifying soil particulate organic matter using image analysis
Rapid and cost-effective quantification of soil organic carbon (SOC) fractions that are responsive to management will improve soil health assessment and associated decision support tools. The particulate organic matter (POM) fraction of SOC is of interest due to its sensitivity to management and …
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Aerosol Optical Properties and the Influence of Particulate Organic Matter
… it can be concluded that (1) presence of organic compounds (i.e., glutaric and succinic acids) decrease the hygroscopic growth of aerosol particles when compared with aerosol particles composed of pure inorganic compounds (i.e., sodium chloride and ammonium sulfate) and that increasing the …
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The effects of augmentation of coarse particulate organic matter in hyporheic sediments
… hyporheic zones may depend on inputs of coarse particulate organic matter. Our research focused on how differing quantity and quality of organic matter affects metabolism and nutrient retention in the hyporheic zone of a low-order Appalachian stream. We hypothesized that hyporheic metabolic …
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The use of corn pollen and glass beads to estimate fine particulate organic matter retention
… beads were used as surrogates of natural fine particulate organic matter (FPOM). These particles were released into ten streams in three different physiographic regions, Appalachian Mountains, Rocky Mountains, and Central Plains, within the United States. Mean travel distance for corn pollen …
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Characterization, seasonality and source apportionment of fine particulate organic matter at urban an d rural sites
To better understand the sources of organic PM and the effect of secondary organic aerosols (SOA) on PM levels, samples of fine particulate matter were collected outside Durham, NC in the Duke Research Forest as part of the CELTIC study in July 2003. Among compounds analyzed, oxidation products of …
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The Role of Floods in Particulate Organic Matter Dynamics of a Southern Appalachian River/Floodplain Ecosystem
I investigated the role of a flood in particulate organic matter (POM) dynamics of the Little Tennessee river/floodplain ecosystem in western North Carolina, USA. I measured litter inputs, leaf breakdown, floodplain litter, and aboveground herbaceous net primary production at 12 sites. Annual …
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Processes and community structure in microbial biofilms of the River Elbe: relation to nutrient dynamics and particulate organic matter
… was the investigation of the dynamics of inorganic nitrogen compounds in the upper sediment layers, as highest microbial activity could be expected due to increased import of nutrients. Dissolved oxygen is suggested to control the nitrogen dynamics in the hyporheic zone, as dissolved oxygen …
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The use of high-resolution imaging tools for estimation of hydraulic soil properties and quantification of particulate organic matter
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Fast food : the transport of particulate organic matter over an upwelling event on the west coast of southern Africa
… in transport, composition and supply of particulate organic matter (POM), as a food source for coastal consumers, were investigated between an exposed headland (Cape Columbine) and a sheltered bay (Elandsbaai) in the southern Benguela. Physical data, in agreement with previous studies, …
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Primary production of particulate protein amino acids : algal protein metabolism and its relationship to the composition of particulate organic matter
… bases underlying primary production of particulate protein amino acids were investigated in an effort to understand the relationship between algal protein metabolism and particulate organic matter composition. In order to examine biochemical processes associated with conversion of …
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Ecological characteristics of stream reaches with and without low-tech process-based restoration in a wildfire-affected watershed
… size, water temperature, benthic algae, fine and particulate organic matter, large wood, riparian vegetation, macroinvertebrate communities, and brook trout density and size structure. The relict beaver site had more shallow, lentic habitat, finer substrate, increased particulate organic matter, …
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The Influence of Switchgrass Establishment on Soil Organic Matter Pools in an Agricultural Landscape
… accelerates the decomposition of soil organic matter, contributing to atmospheric carbon and declining soil fertility. Planting perennial warm season grasses is a useful management alternative to row crop agriculture because these species have been shown to be effective at increasing …
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The exo-proteomic framework for nitrogen acquisition from proteinaceous organic matter in the model marine heterotroph Ruegeria pomeroyi DSS-3
… a key component of surface and upper mesopelagic particulate organic matter, and their rapid degradation by heterotrophic bacteria is an important process in releasing bioavailable nitrogen when other nitrogen containing substrates are deficient. Heterotrophs encode a wide variety of hydrolytic …
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Interactions Between Protozoan Prey (<i>Phylum protista</i>) and Their Mosquito Predators (Order <i>Diptera</i>, Family <i>Cuclicidae</i>) Prey Size and Predator Behavior Effects
… on microorganisms (including protozoans) and particulate organic matter Most larval feeding experiments. howt:ver, have dealt exclusively with bacteria, fungi , and particulate organic matter Although bactena and fungi are important sources of nitrogen and lipids, they may be 111sufficient …
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Influence of Multiple Disturbances on Stream Structure and Function
… July to December 2004 by determining benthic organic matter standing stocks, ecosystem metabolism, and by using solute additions to examine differences in phosphorus uptake and hydrology over the monitoring period. Influences of the press disturbance were evident in the mine-influenced reach …
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The effects of forest disturbance on stream stability
… was defined as the ability of streams to retain particulate organic matter and nutrients during storms. I hypothesized that forest streams are least stable during the intermediate stages of forest succession because particulate organic matter accumulations in streams are lowest at that time. This …
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Estrutura e função de comunidades de insetos aquáticos em um sistema fluvial de Mata Atlântica no sudeste brasileiro, com especial referência à avaliação do conceito de continuidade de rios (CCR)
… that there is a trend in increasing the fine particulate organic matter as well as a decreasing in the coarse particulate organic matter, along the longitudinal gradient of the river. The biomass variation of the trophic functional categorias has shown a picture similar to the modifications …
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Organisch-geochemische Untersuchungen der Oberflächengewässer aus dem Einzugsgebiet der Sielacht Esens (Ostfriesland)
This thesis presents results of organic-geochemical investigations of surface waters from the catchment area of the Sielacht Esens. Pyrolysis-GC/MS with TMAH (tetramethylammonium hydroxide) was used to characterize the DOM fractions on a molecular level. The obtained results are compared with the …
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An introduction to the study of phosphorus dynamics in Rondevlei
… Solids (TDS), Total Suspended Solids (TSS) and Particulate Organic Matter (POM) were measured in the laboratory.
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