Research Of Insect Communities And Its Relationship To Habits In South Bank Of Hangzhou Bay Wetland

Insects play an important part in the biodiversity of wetlands, which community structure anddynamic changes reflact the stability and health of wetlands. Hangzhou Bay Wetland as the transitionzone of coastal wetlands in China, lies in the west part of Hangzhou Bay Sea-crossing Bridge and hasmany advantages in developing tourism resources and protecting the biodiversity. But there are rarelyresearches about the biodiversity of the south bank of Hangzhou Bay Wetland. In this paper, it wascomprehensive studied for the biodiversity of this wetland monthly from July of2010to June of2011,analied the composition and temporal dynamics of insect communities. In order to provide a theoreticalbasis and based information for protecting biodiversity and applicating of insect populations asindicators in wetland quality evaluation, we also discussed the relationship between insects communityand environment variables such as plants and soil variables. All the experiments above were supportedby wetland ecosystem research station in Hangzhou Bay of the State Forestry Administration.We collected insects monthly from June of2010to June of2011in reclaimed wetland by netsweeping and pitfall traps, collected insects in natural coastal wetland and newborn sandbar wetlandtogether with experimental forest by net sweeping. A total of68511insects belonging to12orders,94families and356species were collected, and we chose32insects for example Tetrix japonica (Bolivar)as indicators for Hangzhou Bay wetland. The main conclusions were as follows:(1) The composition of insects in the south bank of Hangzhou Bay wetland was abundant andColeoptera with Diptera were the dominant groups. The diversity index between seasons weresignificant different, the species number in summer was the highest and in winner was the lowest, whilethe abundant index in summer or autumn was the highest and in winner was the lowest. Dominanceindex and evenness index was the highest in winner or spring.(2) The trend of the changes in the diversity index was coincident with that of abundant index thatreclaimed wetland＞experimental forest＞natural coastal wetland＞newborn sandbar. Dominance indexin natural coastal wetland was the highest and that of reclaimed wetland was the lowest.(3) From the results of clustering analysis and similarities analysis we know that the insectcommunity of natural coastal wetland and newborn sandbar were similar, and the insect community ofreclaimed wetland and experimental forest had a high similarity. (4) The result of CCA, based on diversity of dominant insects and environment variables,presented that soil water content, phosphorus content and plant coverage have a major impact on thediversity of dominant insect communities.