Search for dissertations about: "peak phosphorus"
Showing result 1 - 5 of 15 swedish dissertations containing the words peak phosphorus.
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1. The Story of Phosphorus : Sustainability implications of global phosphorus scarcity for food security
Abstract : The story of phosphorus began with the search for the philosopher’s stone, and centuries later the critical role of phosphorus in soil fertility and crop growth was highlighted. Eventually, phosphorus was implicated in the global environmental challenge of eutrophication. READ MORE
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2. Environmental impact of peat mining : Development of storm water treatment methods
Abstract : Drainage of peatlands increases the transport of suspended solids (SS) and the leaching of nutrients to downstream receiving waters. Increased settling of peat and eutrophication of lakes has been noted in many studies downstream from peat mines. READ MORE
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3. Molecular detection of abundance and activity of marine, symbiotic, N2-fixing cyanobacteria
Abstract : Marine primary productivity in large parts of the oceans is supported by nitrogen fixers (diazotrophs). Richelia, a genus of multiple closely related species of heterocystous filamentous cyanobacterial diazotrophs, are often found in symbioses with a few genera of diatoms. Several Richelia species: R. euintracellularis, R. READ MORE
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4. Filter beds for on-site wastewater treatment : Towards more reliable estimations of phosphorus retention
Abstract : Phosphorus (P) is an important plant nutrient and essential for life. However, thephosphate rock used for fertilizer production is a non-renewable resource and itsproduction is expected to peak. At the same time, the discharge of P into naturalwaters is causing eutrophication, a severe problem in areas such as the Baltic Sea. READ MORE
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5. Small wetlands designed for phosphorus retention in Swedish agricultural areas : efficiency variations during the first years after construction
Abstract : This thesis examined retention of particles and phosphorus (P) losses from agricultural clay soils in small wetlands with an initial deep area followed by a shallow area with emergent plants. Two long, narrow wetlands (Bergaholm and Nybble) specially designed for P retention (P-wetlands) were constructed, and their efficiency in sediment accumulation were compared with those of six existing wetlands with a different design. READ MORE