阳澄湖湿地修复对浮游植物群落结构的影响研究

Impact of Wetland Restoration on Phytoplankton Community Structure in Yangcheng Lake,China

开展了阳澄湖平水期、枯水期和丰水期湿地修复对浮游植物群落结构影响的调查。布设11个点位,其中6个点位在修复区。结果表明,阳澄湖浮游植物共含8门13纲15目30科74种(属),修复区的浮游植物密度在丰水期和枯水期分别为非修复区的5.1%和35.2%;非修复区的优势藻种数量为修复区的64.3%;修复区浮游植物的Margalef丰富度指数(D)、Shannon多样性指数(H')、Simpson多样性指数(λ)及Pielou均匀度指数(J')均值均高于非修复区。指出,修复区的浮游植物群落更加稳定,湿地修复对阳澄湖水质净化有一定效果。

To explore and evaluate the effect of wetland restoration project in Yangcheng Lake during the normal,low,and high water periods phytoplankton monitoring were carried out from 2020 to 2021,with 11 locations set up,including 6 in the restoration area.There were 74 species belonging to 8 phyla and 74 genera from 33 phytoplankton samples.During dry season,phytoplankton density in the restoration area was only 5.1%of that in the non-restoration area.In wet season,phytoplankton density in restoration area was 35.2%compare with restored area.The number of dominant alga species in the non-restored area was only 64.3%of that in the wetland restoration area.The mean values of Margalef richness index(D),Shannon diversity index(H'),Simpson diversity index(λ)and Pielou evenness-index(J')in the wetland restoration area were higher than those in the non-restored area.It is pointed out that the phytoplankton community in the restoration area is more stable and complex,and the wetland restoration has a certain effect on the water quality purification of Yangcheng Lake.