Biodiversity And Purifying Effect On Eater Quality Of Vegetation In The Hongze Lake Wetland In Sihong Prefecture, Jiangsu Province

Wetland is one of the most significant ecosystems on the earth. The diversity aquatic plant resources are the basic of wetland ecosystem .It's protecting and using in reason are also the important aspects of wetland programming. The reconstruction of aquatic plant communities in wetland is an administer mode which combined by ecology principles and program controlling. The core of this reconstruction is implementing the manual control and ecology recovery functions in promise of ecology protection.The thesis researched the diversity of aquatic plant in wetland and the research works mainly include the following aspects:First, the plant diversity in Hongze Lake wetland was studied in systemic and it give the aim of the reconstruction planning of aquatic plant which make the scheme of protection and reconstruction promoting.Second, water quality is the ecological restrict factor that direct affects the Hongze Lake wetland ecosystem. Through the analysis on the ingredients of Hongze Lake, the pollution of BOD₅ is the first problem. Pollution of N, P is the other affection that we should pay more attentions.Third, Based on the experiment, analyzing specially the plants' habitat distributions, it is demonstrated that the ecosystem is generally good, but there are some environmental troubles, such as excess innings, illogical manners of life and production, extensive management, the destruction from partial foreign species, and wetland reduction in cultivated region. Hence, the wetland construction can restore the ecosystem and conserve the wetland reserve.