Impacts Of Flaveria Bidentis Invasion On Soil Animal Communities N Different Habitats

The invasive alien species Flaveria bidentis, also called Yellow-top, was a worst weedwhich invaded China in recent years. It was first recorded in Hengshui Lake of Heibeiprovince in2003, and has been dispersed widely to many places of northern China, includingCangzhou, Handan, Xingtai, etc. of Heibei province and some region of Henan province,Shandong province and Tianjin, causing serious damages to agricultural production andecological environment. Depended on its powerful adaptability, F. bidentis spreaded quicklyin our country after invasion. It squeezed out native plant by compete or occupy ecologicalniche, then generated monodominant community and resulted in simplification of communitystructure, reduction of species diversity and recession of ecological function. At present,many researches about the influence of F. bidentis invasion on plant communities and soilmicroorganism communities have been carried out, but no report concerned soil animalcommunities.The objective of this paper is to analyse the impacts of F. bidentis invasion onsoil animal communities in different habitats.In order to study the effects of F. bidentis invasion on ground-dwelling soil animalcommunity, the pitfall trap is used to investigate ground-dwelling soil animals every twoweeks from April26to September17in2012. A total of439515individuals are collected inthree habitats among which346760individuals belong to3phyla,7classess,21orders arecollected in forestland habitat,54213individuals belong to2phyla,5classess,15orders arecollected in uncultivated habitat and38542individuals belong to3phyla,7classess,15orders are collected in ditch habitat. The data indicate that Formicidae is dominant taxa in thecommunity of ground-dwelling soil animals, while the relative abundance of other taxa aresmall. As the analysis result demonstrates, the microclimate of three habitats is changed andthe ground-dwelling soil animal community structure is affected after the invasion of F.bidentis, which give rise to the increase of ground-dwelling soil animal diversity.To study the effection of F. bidentis invasion on soil meso-micro fauna community, soilsamples of invaded plots and uninvaded plots are collected in three habitats before and afterF. bidentis,s florescence. The soil meso-micro fauna of each plots are extracted by Tullgrenfunnel while some soil nutrient indexes are also measured. A total of1087individuals arecollected in three habitats among which146individuals belong to2phyla,7classess,12orders are collected in forestland habitat,179individuals belong to1phyla,4classess,8orders are collected in uncultivated habitat and762individuals belong to1phyla,4classess,7orders are collected in ditch habitat. Data shows that Acarina and Collembola are dominant taxa in the community of soil meso-micro fauna. The quantity and distribution of dominanttaxa are affected and the community structure of soil meso-micro fauna is changed after theinvasion of F. bidentis, which lead to the improve of soil meso-micro fauna diversity.