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《Resources and Enuironment In The Yangtza Basin》 2001-06
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DISSOLVED SILICATE FLUX FLUCTUATION FROM RIVERINTO THE SEA:A CASE STUDY IN CHANGJIANG

CHENG He-qin+{1,2},Li Mao-tian+1(1.State Key Laboratory of Estuarine & Coastal Research, East China Normal University, Shanghai, 200062,China; 2.State Key Laboratory of Loess and Quaternary Geology,The Chinese Academy of Sciences, Xi'an 710054,China)  
The time series data of dissolved silicate and inorganic N, P, discharge and sediment discharge, precipitation recorded at 10 water gauge stations along the watershed of Changjiang from Yushu, Qinhai to Shanghai, China since 1950's are reviewed with numerical and linear imitation analyses. An apparent decrease of dissolved silicate (DSi) as 53.33 μmol/L is observed from 1959~1984 with the decrease of sediemnt discharge and the increase of DIN, water discharge and precitation. While nutrient structure parameter DSi/DIN is falling,DIN/DIP is rising. A positive decrease tendency of DSi to sediment discharge (confidence is 0.896) implies the sharp increase in the construction of dams and water conservancy facilities.The nagative trends of DSi to DIN change (confidence is 0.792) indicates the eutrophication with great human waste disposal and large quantity of fertilizer usage.The nature of nutrients and sediment flux has changed from upper reaches to the open sea and also plankton species composition in the Changjiang Estuary.
【Fund】: 上海市教育发展基金曙光计划 ( 99SG1 3);; 高等学校骨干教师计划;; 中国科学院黄土与第四纪地质国家重点实验室开放课题的部分成果
【CateGory Index】: X131.2
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