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The Effect of Organic Matter and Submerged Macrophyte on Nitrogen & Phosphorus Mineralization and Pools in the Lake Sediment

Author: YangChunXia
Tutor: WangShengRui
School: Chinese Academy of Environmental Science
Course: Environmental Engineering
Keywords: Nitrogen and phosphorus mineralization LFOM Dissolved Organic Matter Rhizosphere
CLC: X524
Type: Master's thesis
Year: 2009
Downloads: 401
Quote: 2
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Abstract


The Lake Eutrophication is our water environment issues , the most prominent problem , when the lake outside source pollution gradually brought under control , as the endogenous sediments overlying water nitrogen , an important source of phosphorus . Mineralization of organic nitrogen and phosphorus in the lake sediments above the soil , the Institute selected lakes sediments 9% -39 % of the total nitrogen , 5.7% -26 % of the total phosphorus mineralization , and the amounts of mineralized sedimentary matter pollution levels are closely related : heavy sediment pollution degree of the amount of nitrogen and phosphorus mineralization and mineralization rate was significantly higher than the degree of light pollution in the sediment . Organic matter quality is an important factor affecting the organic nitrogen and phosphorus mineralization : LFOM (LFOM) on the one hand can be used as a potential source of nitrogen and phosphorus mineralization , on the other hand , the removal will destroy the sediment cement aggregates makes inorganic nitrogen and phosphorus release increased significantly ; dissolved organic matter (DOM) content of to influence sediment microbial biomass nitrogen and urea enzyme activity , and itself as a potential source of nitrogen mineralization , LFOM and DOM removal will make the amount of mineralization of organic nitrogen and phosphorus and mineralization rates were reduced . Under continuous culture conditions , the amount of sediment nitrogen mineralization was parabolic flat in the middle , and the amount of leaching and nitrogen mineralization with increasing incubation time. , And the maximum cumulative nitrogen leaching and the changes over time the mineralization is less than the peak continuous culture under nitrogen mineralization amount . Submerged plant Myriophyllum makes the overlying water and sediment pore water, ammonia concentration and the solubility of the active phosphorus ( SRP ) , a significant decrease in the solubility of total phosphorus (TDP) concentrations . Compared with the non- rhizosphere sediment , the rhizosphere sediment pore water ammonia and SRP concentration decreased significantly , but little nitrate nitrogen and TDP concentrations .

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control > Lakes and reservoirs
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