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《Geology of Chemical Minerals》 2002-01
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PHOSPHORUS BURDEN ON WATER BODY OF DIANCHI LAKE AND ITS IMPACT ON WATER ENVIRONMENT

Tian Shengping Dongye Maixing Zhou Jianmin Xia Xuehui Zhang Zhuo( Geological Institute for Chemical Minerals) ( Yunnan University)  
Phosphorus stands as a controlling element of the nutrition of the water body of Dianchi lake to become a burden on it. The phosphorus burden is derived, as a rule, from two channels, input of phosphorus from the peripheral environment and output of phosphorus from the lake itself. Phosphorus is generally deposited in the water body and bottom sediments of the lake. The depositional level lowers progressively from north to south in the water body while elevates gradually from north to south in the bottom sediments. P2O5 contents of the 03m sediment of the lake bottom decrease evidently from top to bottom, suggesting that the phosphorus burden is aggravating yearly. According to newly data, the phosphorus burden of unit area in the lake has reached 1.52g/m2, 11.7 times more than acceptable limit, meaning that Dianchi has become a richly nutrient lake. Consequently, only by attaching importance to both the peripheral phosphorus input and the phosphorus output of the lake itself can its phosphorus nutrition be controlled.
【Fund】: 国家自然基金项目(编号 49872047)部分成果
【CateGory Index】: X524
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