Study On The Arthropod Community In Vegetable Soybean Field

Based on the previous research, the thesis reviewed international research progress on the soybean pest, combining the development strategies of research on arthropod community and integrated pest management. The dynamics of the arthropod community in vegetable soybean fields and the effects of different pesticides on the arthropod community and diferent sub-communities were studied. The researching results were as follows:1 Structure of the arthropod community in vegetable soybean fieldsThe arthropod community in vegetable soybean fields were divided into four sub-communities, which are pests, predators, parasitoids and neutralities. The structure and dynamics of the arthropod community and diferents sub-communities were analyzed by using a number of community parameters in the fields cultured vegetable soybean varieties of Green 75, 2808 and Chadou respectively. The results indicated that there were 144 species of arthropod belonging to 3 Classes, 13 orders, 6 5 families in three vegetable soybean fields, including 51 species (taxa) of insect pests belonging to 25 families, 48 species (taxa) of predators belonging to 21 families, 23 species (taxa) of parasitoids belonging to 12 families and 22 species (taxa) of neutralities belonging to 14 families.The relative abundance of pests , predators, parasitoids and neutralities were 0.6361-0.7018 ,0.1641-0.1907, 0.0418-0.0647 and 0.0923-0.1085 respectively in Spring sowing season . The relative abundance of pests , predators, parasitoids and neutralities were 0.9483-0.9749, 0.0097-0.0164,0.0087-0.0173 and 0.0067-0.0188 respectively in Fall sowing season.The dominant species in pests and predators sub-communities in three fields were almost the same. In Spring sowing season, dominant concentration of the arthropod community in the Chadou was larger than that in the Green 75 and 2808; In Fall sowing season, dominant concentration of the arthropod community in the Green 75 was larger than that in the Chadou and 2808. The diversities of the arthropod community in three fields were compared by different indices. It was found that the DG index was Chadou>Green75> 2808 and Green75> Chadou >2808, and that was superior to other analyzing the diversity of different arthropod communities. This suggested that the possibility of pest outbreak in 2808 field was larger than that in other fields. The dynamics of the diversities(H') and evennesses in pests sub-communities and arthropod communities in three fields was almost the same, changing from loosely to highly tended, to loosely, and then, to highly tended again. And that of the predators sub-communities changed from highly to loosely tended, and then, to highly tended...