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《Journal of Lake Science》 2001-01
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Phosphorus Release and Absorption of Surficial Sediments in Taihu Lake under Simulative Disturbing Conditions

ZHANG Lu FAN Chengxin QIN Boqiang YANG Longyuan (Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing, 210008, P.R.China)  
The phosphorus release and absorption of surficial sediments in Taihu Lake was studied under simulative disturbing conditions. The results showed that the sediment release effects of the Wulihu Lake and the Meiliang Bay were not as remarkable as expected. Under lower disturbing intensities, the release processes were not obvious. As the disturbing intensity became greater, an obvious release process was observed. The time needed in getting maximal release was distinct because of the different phosphorus constitutions. The phosophorus absorption was obivous under simulative condition. The phosphorus concentrations of upper water of surficial sediments in Taihu Lake were reduced from 0.229mg/L and 0.215mg/L to 0.05mg/L and 0.013mg/L under disturbing condition of 100rpm and 25℃, respectively. The experiment showed that the absorption intensity was much greater than the release intensity in higher phosphorus concentration of upper water of surficial sediment. Under 25℃ and moderate disturbing intensity (100rpm), when the initial phosphorous concentration was 1.01mg/L, the absorption capacity of surficial sediments of the Meiliang Bay and the Wulihu Lake could be up to 0.042mg and 0.050mg phosphorus per gram dry sediment. This huge absorption capability of surifical sediment may play a positive role in phosphorus buffering in shallow lakes.
【Fund】: 中国科学院资源与环境“九五”重点课题! (KZ - 95 2 -J1- 2 12 );; 江苏省自然科学重点基金! (BK992 0 4- 2 )资助
【CateGory Index】: P512.3
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