Studies On The Dynamics Of Arthropod Communities And The Disturbance Of Pesticide In Cherry Field

Based on the thorough investigation,the dynamics of the arthropod communities of cherry plants and interaction of main insects with ints natural enemies were studied by meas of community analysis ,path analysis, grey systematic analysis,ecological niche analysis, and aggregation level index.these provoded theory foudation for SPM. 1 The arthropod community of cherry plants was divided into threesub-communities ,which were phytophages ,predators ,parastitoids and neutralities .The results were showed 62 species of arthropod belonging to 50 famlies ,40 species of phytophages belonging to 32 families,18 species of pradators belonging to 14 faimilies,and 4 species of parastitoids and neutralities belonging to 4 families.The number and relative abundance of phytophages were 20350 and0.85803,the number and relative abundance of predators were 2419 and 0.10199,the number and relative abunadance of parastitoids and neutralities were 948 and 0.03997.Myzus persicae and Emposaca flavescens(Fab.) were dominant insects of phytophages .Harmonia axyridis and Misumenops tricuspidatuswere dominant enemies of predators .The dominance of total communities was 0.85803,Domiance and dominant concentration of every sub-community showed parastitoids and neutralities> total community > phtophages > pradators.2 The tendency of Hill diversity and pielou evenness of the total community was from high to low ,to high again, Hill diversity index was in relation to species ,individuls ,dominant concentrtion,pielou eveness ,dominance and speicies richness by path analysis.Hill diversity index was most relative with dominant concentration(-0.9813) and dominance(-0.9713),which showed the higher dominance and domDiversit indexes(species ,individuls ,dominant concentrtion,pielou eveness ,dominance and speicies richness) of arthropod communities were analyzed by clustering and optimzation partitions .D=0.6,Total community was devided into four stages,Ⅰ:4.11,10.24,Ⅱ:4.25,5.9,5.23,6.6,6.20,7.4,8.29,9.10,9.26,10.10,Ⅲ:7.17,8.1,8.15,11.7,Ⅳ:11.21。The result of the optimization partitions of total community was five stages : 4.11-5.9 , 5.23-7.4 , 7.17-8.15 , 8.29-10.24 , 11.7-11.21。inant concentration ,the lower Hill diversity of community.3 Diversity indexes(species ,individuls ,dominant concentrtion,pielou eveness ,dominance and speicies richness) of arthropod communities were analyzed by clustering and optimzation partitions .D=0.6,Total community was devided into four stagesⅠ:4.11,10.24,Ⅱ:4.25,5.9,5.23,6.6,6.20,7.4,8.29,9.10,9.26,10.10,Ⅲ:7.17,8.1,8.15,11.7,Ⅳ:11.21。The result of the optimization partitions of total community was five stages:4.11-5.9,5.23-7.4,7.17-8.15,8.29-10.24,11.7-11.21.4 Diversity indexes(species ,individuls ,dominant concentrtion,pielou eveness ,dominance ,hill divesity and speicies richness) of arthropod communities were analyzed by principal component analtsis ,which showed the N,S ,R,H` were synthetic of community construction.5 The characteristics of community structures of Myzus persicae after treated with two pesticides carbosulfan and qiangxing were analysed and compared. The result showed that carbosulfan was more quick effective ,high-performanceand persistence.while the Hill diversity of carbosulfan was alwas higher than CK and qiangxing.with lowerlethality of natural enemies.6 Relevancy of Erythroneura sudra with its natural enemies was studied by using grey systematic analysis,the ecological niche analysisand Synthetical ordered analysis and niche overlap analasis , both the temporal and horizontal niche overlaps were showed thatHarmonia axyridis,Erigonidiumgraminicola,Misumenops tricuspidatu andTetragnathidae.