连环湖区域小东湖表层沉积物营养盐变化特征与污染评价研究

于2010年8月赴连环湖小东湖采集表层沉积物样品.在对小东湖表层沉积物总氮(TN)、总磷(TP)及磷形态、有机质(OM)、粒度指标测试分析的基础上,探讨小东湖表层沉积物营养元素变化特征及影响因素,并采用有机指数与有机氮指标对小东湖表层沉积物的污染状况进行评价.研究结果表明,TP平均含量为535.75 mg/kg,接近于富营养化严重的太湖和巢湖,小东湖表层沉积物Ca-P、IP、TP受<4 μm、4~16 μm、>64 μm粒级含量影响较大,Fe/Al-P和OP受粒度影响较弱.小东湖有机指数为Ⅱ等级,属于较清洁范畴,有机氮指标达到Ⅳ等级,为有机氮污染.

variation Characteristics and Pollution Assessment in Surface Sediments from Xiaodong Lake in Lianhuan Lake

The surface sediment samples of Xiaodong Lake in Lianhuan Lake were collected in August 2010.On the basis of total nitrogen ( TN ) , total phosphorus ( TP ) , this paper discussed the morphological changes of phosphorus and organic matter ( OM) and particle size in the surface sediments of Xiaodong Lake, variation characteristics and influencing factors in surface sedi-ments from Xiaodong Lake.Based on the organic index and organic nitrogen, the pollution situation of the surface sediments in Xiaodong Lake were evaluated.The results showed that the average content of TP was 535.75 mg/kg, closed to the serious eu-trophication of Taihu Lake and Chaohu Lake, The Xiaodong Lake surface sediments of Ca-P, IP, TP has greater affected with<4 μm,4~16 μm, >64μm particle size, but Fe/Al-P, OP has less affected with particle size.The average organic index was on the Ⅱ level still belonged to relatively clean category, and the average number of organic nitrogen was on the Ⅳ level indicated the pollution degree.