中文摘要：

以2009年-2011年的实地监测资料和前人的研究资料为基础,分析了东平湖湿地水型、湖水营养盐的时空变化特征以及湿地植物、土壤、水文的净化功能,并探讨了水质变化原因和净化机理。结果表明：人为干扰作用下,东平湖水型已由20世纪80年代的碳酸盐型转变为硫酸盐型；由于入湖河流污染,湖泊入湖口比出湖口总氮、总磷含量明显要高；经过治理,21世纪比20世纪90年代总氮、总磷的含量分别降低了16%与48%；菹草对总氮、总磷的去除率分别达85%与54%；丰水期与枯水期的总氮、总磷含量均比平水期少,因此东平湖湿地净化功能与土壤、植物、水文状况以及人为干扰有着密切的关系。

英文摘要：

Based on the monitoring data of the wetland ecosystem of the Dongping Lake from 2009to 2011and previous studies,the spatial and temporal variation of wetland water type and water nutrients and the purified function of wetland plants,soil,and hydrology were analyzed,and the reason of water quality variation and purified mechanism were discussed.The results showed that（1）the water type in the Dongping Lake has changed from carbonate-type in the 1980sto sulfate-type due to human activities;（2）the contents of total nitrogen（TN）and total phosphorus（TP）in the lake inlet are higher than those in the lake outlet as a result of pollution in the river flowing into the lake;（3）the contents of TN and TP in the 2000sdecrease by 12%and 55%compared with those in the 1990safter pollution control;（4）the removal rates of potamogeton crispus on TN and TP in the wetland reach 85%and 54%,respectively;and（5）the contents of TN and TP are lower in both flood and dry periods than those in the normal period.Therefore,the purified function of wetland ecosystem in the Dongping Lake is related to the soil,plant,and hydrology and human activities.