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Effect of Submerged Macrophytes Together with Sediments on the Circulation of Phosphorus of Eutrophi

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Tutor: ChiJie
School: Tianjin University
Course: Environmental Science
Keywords: Submerged plants,Sediment,Phosphorus cycle,Phosphorus forms
CLC: X524
Type: Master's thesis
Year:  2007
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Abstract:
Water - sediment interface the conversion area between the water and sediment, is a special and important area of ??the water environment. Submerged plants as an important part of the regional ecosystem, the migration of phosphorus on the water - sediment interface, transforming play a regulatory role. The topic \impact study. Sampling during the dedication on the lake overlying water total nitrogen concentration of 6.21 mg / L ~ 2.70 mg / L, total phosphorus concentration of 0.18 mg / L to 0.12 mg / L, total nitrogen and total phosphorus concentrations are far more than the concentration of the occurrence of eutrophication . Potamogeton crispus during the growing season, in addition to the dissolved organic phosphorus, dedicated on the lake overlying water total nitrogen, total phosphorus, particulate total phosphorus, soluble total phosphorus and dissolved reactive phosphorus concentration of with Potamogeton crispus biomass increase and decrease, and Potamogeton crispus decline and then began to increase. Surface water and pore water alkaline phosphatase activity also showed the same trend, and alkaline phosphatase activity of the surface water is always greater than the pore water, submerged plants on the inhibition of alkaline phosphatase activity is submerged plant purification one of the important features of the water quality. Dedication during the sampling exchangeable phosphorus in the sediments of Lake algae, the iron binding phosphorus and debris phosphorus content is always higher than the grass-type sediments, occluded phosphorus from raw and organic phosphorous content is just the opposite, two sediments Al phosphorus were not detected. It can be concluded that the Potamogeton grass growth and absorption of bioavailable phosphorus in the overlying water and surface sediments, siltation makes the plant and animal residues in phosphorus accumulation in surface sediments (TOC content of 6.26% ~ 8.89% of the organic phosphorus content of 25.4 mg / kg ~ 62.8 mg / kg), suppressed by changing the physical and chemical environment of the surface sediments in surface sediments difficult to use biological phosphorus release, and thus indirectly reduce phosphorus in overlying water concentration. Therefore, we can reduce the concentration of phosphorus in the water through regular salvage aging Potamogeton crispus, and the presence of Potamogeton crispus makes an important contribution to the eutrophication of endogenous phosphorus present in the sediments. Seen submerged plant Potamogeton crispus through dedication Lake water - sediment interface phosphorus cycle regulation, the dedication Lake Eutrophication Status played a certain control. Laboratory studies have shown that a significant role in promoting the release of phosphorus in sediments, organic matter, the release also increased with increasing TOC content. With respect to the humic acid, cyanobacteria more likely to promote the release of phosphorus, which is at the same time because of PO43-, SO42-anions such as humic acid in release and Fe3 Al3 cation binding reaction with reactive phosphorus.
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