华阳河湖群底泥沉积物特性研究

Study on Characteristics of Sediments in Huayang River-Lake Group

对华阳河湖群底泥沉积物的粒径、有机质、总磷、总氮含量进行研究,探讨华阳河湖群龙感湖、黄大湖(由大官湖和黄湖组成)、泊湖三大湖区底泥污染物表层及垂向分布规律。结果表明,黄大湖污染程度最大,其底泥中有机质、总磷和总氮含量均比其它湖区要高;有机质,总磷和总氮随着深度而降低,底泥再悬浮释放污染物风险较大;在龙感湖和黄大湖中,总磷和有机质弱相关,总氮和有机质正相关,泊湖则相反,表明3个湖泊底泥沉积物中氮、磷污染负荷的来源有所不同。该研究为研究华阳河湖群内源污染负荷特征和制定湖泊污染综合整治策略提供重要的科学依据。

Surveys were carried out in the Huayang river-lake group consisting of lakes of Longganhu, Huangdahu and Pohu in order to study the lakes＇ internal pollution loading by collecting sediment samples and analyzing the content of organic matter （OM）, TP and TN, as well as particle size in the sediments. On the basis of the surveys, characteristics of surface and vertical distributions of pollutants in the sediments of the Huayang fiver-lake group were analyzed. The study showed that the pollutants content including OM, TP and TN in sediments of Huangdahu were higher than that in other two lakes and decreased with the sediment depth, and there was the risk of pollutants release through re-suspension; content of TP in the sediments of lakes of Longganghu and Huangdahu were slightly correlated with OM, but TN was positively correlated with OM; to the contrary, TP and OM in Pohu were positively correlated, and TN and OM were weakly correlated, which implied that the pollutants sources were different. The study would be conducive to forming a strategy of eco-remediation for the Huayang fiver-lake group.