| Based on the thorough investigation, the dynamics of the arthropod communities in jujube orchard and interaction of the Contarinia sp. with its natural enemies were studied by means of the community analysis , multianalysis , grey system theory and method ,path analysis and geostatistics. The conclusions were as follows.The arthropod communities in jujube orchard were divided into two sub-communities. The structure and dynamics of the arthropod communities and different sub-communities were analyzed by using a number of community parameters and predator-prey relationship in the jujube orchard. The results indicated that there were 52 species of arthropod belonging to 47 families, including 33 species of pests and neutral insects representing 30 families; 19 species of enemies representing 17 families in jujube orchard. The relative abundance of cecidomyidae was the highest in enemies sub-community, 0.230855. Theriodiidae was the highest in enemies sub-community, 0.234201. The dominant concentration and dominance of arthropod communities was 0.127439 and 0.234201. Dominant concentration, dominance, the evenness and the diversities indexes of every communities were compared and the result was dominant concentration and dominance: natural enemies community > pests-neutral insects sub-community > total community; evenness and diversity index on the other way round total community > pests-neutral insects > natural enemies community.The diversities and evenness of every sub- communities was in consistent with the total community: the tendency was from low to high, to low, and then, to high, to low again. The diversity was a function of dominant, concentration species richness and numbers; the main component affecting diversity was dominant concentration. The arthropod communities in jujube orchard went through a succession that apparently changed from development to prosperity, then to depression. Analyzed the investigation results of every communities by system clustering The results of total community and pests –neutral insects sub –community icy were divided into 4 clusters and that of natural enemies sub –community were divided into 3 clusters .The best temporal partitions in the arthropod total communizes and pests –neutral insects sub-community were 6 stages. The result of the natural enemies sub-community was 5 stages.Diversities of arthropod community in jujube orchard were analyzed by path analysis. The results showed Hill diversity index of total community was more relative with dominant concentration in jujube orchard. So was diversity of pests - neutral insects sub-community changes in diversity of natural enemies sub-community were contrary to dominance and dominant concentration.The principal component analysis studied total community and sub-communities in jujube orchard in order to find main factors. Concerning total community, accumulation contribution rate of the four principal components was 91.99%. Accumulation contribution rate of the front three principal components about main pests and natural enemies were 94.13% and 89.48% respectively.Relational grade between ideal dominant enemies and Contarinia sp. was analyzed by grey analysis. Relational grade between Contarinia sp. and its natural enemies were Theriodiidae>Aslidae>Lycosidae. The result showed the relational grade between Erigonidium graminicola and ideal enemies was highest, 0.9827.The following was Misumenops tricuspidatus.The temporal niche breadth and overlap of Contarinia sp.and its natural enemies ,the spatial breadth and overlap of them in different stage of jujube growth were analyzed . Contarinia sp. appeared in all stages of jujube growth, but its population fluctuation showed a peak ,so that its niche breadth index was low. The niche breadth of Thomisidae and Erigonidium graminicolawere higher ; its niche overlap with was also high ,They control Contarinia sp. steadily and successively. The synchronous effect were highest between Theriodiidae and Erigonidium graminicola and Contarinia sp.. Investigations on... |
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