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 42 for “"nutrient fluxes"”.
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Nutrient fluxes and soil microbial processes
… information on the impact of tree species on nutrient cycling, soil properties and microbial activities. In this study, six broadleaved species were growing at the same site with similar condition in terms of soil type, land use history and climate. Thus, the potential effects on …
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Investigating groundwater derived nutrient fluxes within Tauranga harbour, New Zealand
… connects land and ocean, delivering freshwater, nutrients, carbon, metals, and other chemical constituents to coastal waters. In New Zealand, local Māori have had a strong cultural connection to this natural process for centuries. Recently, it has been recognised that this process is important in …
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Nutrient fluxes into the seasonal thermocline of the Celtic Sea
Estimates of vertical fluxes of nitrate (JN) into the subsurface chlorophyll<br/>maximum from the bottom mixed layer were made in a variety of hydrological<br/>regimes over the Celtic Sea in 2003 and 2005. Over a topographically flat shelf<br/>JN varied with the spring-neap tidal cycle (1.1 (neap) …
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Assessment of Estuarine Respiration and Benthic Nutrient Fluxes in Mississippi Sound
… and benthic respiration rates as well as benthic nutrient fluxes along the Mississippi Sound. Respiration was measured in recirculating incubation chambers using Firesting optical DO sensors (PyroScience GmbH), and changes in nutrient concentrations were assessed. Mean water column respiration …
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Mass, heat and nutrient fluxes in the Atlantic Ocean determined by inverse methods
… addressed concerns the circulation and property fluxes across 24°and 36°N in the subtropical North Atlantic. Conservation statements are considered for the nutrients as well as mass, and the nutrients are found to contribute significant information independent of temperature and salinity. …
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Mass, heat and nutrient fluxes in the Atlantic Ocean determined by inverse methods
… addressed concerns the circulation and property fluxes across 24*and 36*N in the subtropical North Atlantic. Conservation statements are considered for the nutrients as well as mass, and the nutrients are found to contribute significant information independent of temperature and salinity. …
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Nutrient fluxes within the Berg River from 1976 to 2017, Western Cape, South Africa
… Eutrophication is caused by elevated levels of nutrients in river systems primarily from poor land management whereby excess nutrients are discharged into fresh water bodies. It is exacerbated by factors such as human population growth, economic growth and climate change. The main aim of this …
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Reconstructing animal-vectored nutrient fluxes in paleoenvironments: A case-study of Aotearoa New Zealand’s burrowing procellariiforms
The cross-ecosystem flux of nutrients resulting from animal activity (animal-vectored subsidies) can significantly impact the communities receiving them. However, these functions are threatened by the ongoing decline and loss of species driving them. To understand ecosystem response to the loss of …
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Partitioning the influence of anthropogenic and oceanic nutrient fluxes in the coastal ocean, and the question of cultural eutrophication
… (~80%), continuous, anthropogenic source of nutrients to NSW coastal waters, predominantly in the form of ammonia nitrogen. The discharged effluent typically dilutes to 1:1000 to form plumes that remain trapped (~90%) by thermal stratification (≥1°C), and are dispersed by the prevailing …
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Mass, heat, oxygen and nutrient fluxes at 30s̊ and their implications for the Pacific-Indian through flow and the global heat budget
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Mass, heat, oxygen and nutrient fluxes at 30°S and their implications for the Pacific-Indian through flow and the global heat budget
Six hydrographic basinwide sections, two in each of the three major ocean basins, are employed in a set of inverse calculations to determine the extent of exchange between the Pacific and Indian Oceans through the Indonesian Archipelago and the net global oceanic heat flux at 30°S. Using a model …
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RESOURCE SUBSIDIES ACROSS THE AQUATIC-TERRESTRIAL BOUNDARIES OF TEMPORARY PONDS
… While larger ponds produced greater total fluxes to terrestrial habitats, smaller ponds were often more productive per unit area. Therefore, a mosaic of small ponds may produce greater or equivalent subsidies and may be of greater value to terrestrial food webs than a single large pond. …
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Quantifying Long-Term Hydrologic and NPS Pollutant Response in an Urbanizing Watershed
… adjacent non-urban basins. Higher annual NPS fluxes of total suspended solids (TSS), phosphorus (P), and nitrogen (N) in Cub Run are identified with periods of increased soil disturbance from urban land development and significantly increased storm volumes resulting from higher mean impervious …
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Nutrient Movement in Streamside Management Zones and Piedmont Streams Following Forest Fertilization
… on limited or inadequate data with regard to nutrient fluxes from silvicultural activities. Previous studies in forested watersheds have shown slight post-harvest increases of several nutrients in streams. Also, in agricultural settings, increased nitrogen (N) and phosphorous (P) levels have …
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Estuarine sediment nutrient exchange: the importance of physical transport mechanisms and benthic micro-communities
… and physical transport mechanisms on sediment nutrient flux were investigated for two nearshore sediment types on Virginia’s Eastern Shore. Subtidal sandy mineral sediments were conducive to water transport and subsequently influenced by groundwater discharge to a greater degree than less …
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Dispersal and remineralisation of biodeposits: Ecosystem impacts of mussel aquaculture
… biodeposits increases sediment oxygen demand and nutrient regeneration, thus enhancing the benthic-pelagic coupling of nearshore ecosystems. In New Zealand the mussel Perna canaliculus has a high natural abundance and is also intensively cultured. This thesis examines the dispersal and …
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Effects of land-use changes on the properties of a Nitisol and hydrological and biogeochemical processes in different forest ecosystems at Munesa, south-eastern Ethiopia
… chemical properties, (ii) quantifying water and nutrient fluxes under the different forest ecosystems, and (iii) assessing nutrient dynamics in water flowing through the soil under the different forest ecosystems. Soil samples were taken from the organic layer and at 0-20, 20-40, 40-70, 70-100 cm …
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Free and peptide amino acid fluxes across the mesenteric and non-mesenteric viscera of sheep and calves
… equivalent to 25% of daily crude protein intake. Nutrient fluxes from the mesenteric and portal-drained viscera were measured; non-mesenteric flux was calculated as the difference between portal flux and mesenteric flux. Results of this study support the concept that free amino acids are absorbed …
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Freshwater Invertebrate Assimilation Nutrients from Detrital Biofilms Under Light and Phosphorus Manipulation
… or riparian zones increases light exposure and nutrient fluxes to streams affecting primary productivity and carbon (C) flows across aquatic food webs. Further understanding the synergistic effects of light and nutrients on detrital biofilms may explain how aquatic detritivores respond to …
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Shear enhanced nutrient supply at the Mesoscale
… phytoplankton require a regular supply of nutrients to grow. In the open ocean such nutrients are abundant in the dark waters below the euphotic zone. Hence, to a large extent it is the physical mechanisms driving the transfer of nutrient rich water into the euphotic zone which dictate …
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