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《Shanghai Environmental Sciences》 2001-02
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Preliminary Study on Nitrogen and Phosphorus Release from the Creek Sediments, Outskirts of Shanghai

Hu Xuefeng(Dept. of Geography, East China Normal University, Shanghai 200062)Gao Xiaojiang(Dept. of Environmental Science and Engineering, Fudan University, Shanghai 200433;Chen Zhenlou(Dept. of Geography, East China Normal University, Shanghai 200062)  
High loads of nitrogen and phosphorus were found in the sediments of the creeks, of suburb, Shanghai. A laboratory study has been conducted to observe the release of nitrogen and phosphorus from the sediments under both anaerobic and aerobic conditions. The sediment from a fish pond was also used as an experimental material. The results were as follows: 1) anaerobic ammonia release from the sediments was greater and quicker than the aerobic release. Furthermore, high level of ammonia concentrations in anaerobic waters were maintained; in aerobic waters, however, ammonia concentrations decreased sharply after reaching the peaks because of strong nitrification, 2) anaerobic phosphorus release was greater than aerobic and the released ortho-phosphate was mainly from Fe-bound phosphorus, 3) potential of nitrogen and phosphorus release from the sediments of dredged creeks was relatively weak, 4) ammonia and phosphorus release from fish pond sediment was greater than that from creek sediments, though its K-nitrogen and total phosphorus were not the highest. High content of easily degraded organic matter in fish pond sediment was responsible for this.
【Fund】: 国家自然科学基金(批准号:49831070);; 上海市教委重点学科基金资助项目
【CateGory Index】: X831
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