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《Resources and Enuironment In The Yangtza Basin》 2002-03
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SPATIAL AND TEMPORAL VARIATION IN CONCENTRATION OF NITROGEN IN SEDIMENTS AND OVERLYING WATER COLUMNS FROM SHANGHAI COASTAL AREA

ZHANG Bin liang,LIU Min,HOU Li jun,LIU Qiao mei,OU Dong ni,LIU Yun xiang (Department of Geography, Open Laboratory of Urban Environmental Dynamic Process of the Ministry of Education, East China Normal University, Shanghai 200062,China)  
Based on the analysis of N concentration in surface sediments and overlying waters, the result shows that the concentration of NH\++\-4 is high in August, February and November, occupying for 50%~98% of total inorganic nitrogen. In November both NH\++\-4 and NO\+-\-3 obviously increased. On spatial distribution, the concentration of inorganic nitrogen in the south bank of Yangtze estuary is commonly higher than in the north bank of Hangzhou bay. Both BLG and SDK have the maximum concentration of NH\++\-4. The spatial distribution of NO\+-\-3 is consistent with NH\++\-4, and both are influenced by the sewage discharges and the nutrient inputs from the Yangtze River. In overlying water, the concentration of NO\+-\-3 is commonly higher than NO\+-\-2 and NH\++\-4 in February and August, but in November the concentration of NH\++\-4 obviously increased, and exceeded NO\+-\-3. Inorganic nitrogen in overlying water is characterized by greater regional variation, showing the control of sewage discharge and depositional environments. In comparison with nitrogen concentration levels and developing trend from 1980's to 2000's, the findings show that the environmental quality of waters and sediments decreases with time. And water quality is lower than Grade Ⅳ of Marine Water Quality Standard. Maximum value is up to \{9.54\} times higher than the standard. The trend becomes severe.
【Fund】: 国家自然科学基金资助项目 (4 0 13 10 2 0 4980 10 18);; 上海市重点学科资助项目;; 教育部高等学校骨干教师资助计划项目
【CateGory Index】: X55
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