Studies On Structure And Succession Rules Of Arthropod Community In Soybean Field

The investigation of arthropod community was conducted from 2004 to 2005 in soybean field of South District in Changchun, Jilin province. The species construction, structure characters, temporal dynamics and the rulers of seasonal succession in soybean arthropod community and different sub-communities were studied by analyzing the investigate data. The temporal niches of dominant population and interacting relationship of various populations were analyzed; the major species' food web in arthropod community also was constructed in this article. Under different control measures to soybean moth, the disturbance coefficient was provided for analyzing disturbed and recovered characteristics of different communities.There were more than 220 species of soybean arthropod community were attained by web captive and investigation on ground, which included 104 species of natural enemies, 65 species of pests and 52 species of neutral insects.40 relative dominant species were confirmed, which include 16 species of pests, 10 species of natural enemies and 14 species of neutral insects. The emergence size of Thrips tabaci Lindeman, Aphis glycines Mats and Bemisia tabaci Gennaclius were higher than others in pest sub-community. The dominance of predatory enemies including Erigonidium graminicola, Leis axyridis and orius minutus are higher, but parasitoids all have lower dominance. The dominance of Tendipedae was the biggest in neutral sub-community. The temporal niches of 10 arthropod species including Thrips tabaci Lindeman, Aphis glycines Mats and some dominant natural enemies were analyzed, the results suggested that there was the biggest temporal niche overlaps between Thrips tabaci Lindeman and Aphis glycines Mats, and It should impact the dynamic of total community's structure drastically, If these two kinds of pests emergence instantaneously.The single summit curves of richness and individual number during of community changing were discovered when analyzed the temporal dynamics of communities' characters indexes. The ecological dominance, diversity and evenness of community always be impacted by several factors and the fluctuation of dominant populations may be the most important reason. Natural enemy community had the highest stability in three...