Studies On The Dynamics Of Arthropod Communities And The The Relations Of Cecidomyiidae With Its Natural Enemies In Two Jujube Orchards

This thesis came from the project"Special Fund of Anhui Province Governor (y47)—integrated pest management research and application for the free-pollution fruits and vegetables". The dynamics of arthropod communities and the interaction of main pests with their natural enemies were studied through systematic investigation on jujube orchards in Anhui University science demonstration. This will provide scientific basis for IPM in jujube orchards.T-test of the species,numbers and Hill diversity in two different jujube communities. The result showed that these differences have no significance. So we combine the two jujube arthropod communities to analyse .The arthropod community was divided into three sub-communities, which were phytophages, predators, parasitic and neutralities. The results showed 58 species of arthropod belonging to 51 families and 36 species of phytophages belonging to 31 families ,15 species of predators belonging to 13 families in jujube orchards. The relative abundance of phytophages was 0.4007. Cecidomyiidae and Tortricidae were dominant insects of phytophages. The relative abundance of predators was 0.2771. Coccinellidae and Theridiidae were dominant enemies of predators. The dominance and the dominant concentration of total communities were 0.1076 and 0.0623 respectively. Both the dominance and the dominant concentration of every sub-community showed Parasitic and neutrality >predators>phytophages.The seasonal dynamics of J and H'in sub-communities was in consistent with the total community; the tendency with the month liked wave. Hill diversity index was in relation to species, individuals, dominance, Pielou evenness, dominant concentration and species richness. Path analysis results showed that Hill diversity index was most relative with dominant Pielou evenness(0.9207),dominance (-0.6468),species (0.5367). Principal components analysis coordinates analyzed indexes of communities; the results revealed diversity, evenness, species richness and dominant concentration were synthetic indexes of community construction.Diversity indexes of arthropod communities were analyzed by clustering and optimization partitions.When D=2.91 Total community were divided into four stages. When phytophages(D=1.95) and predators(D=2.15) sub-communities were divided into four stages. The optimization partitions in the arthropod total communities were 3.27,4.10~4.24,5.8~6.5 and 6.19~11.6.The result of the optimization partitions of phytophages sub-community was 3.27,4.10~4.24,5.8 and 6.5~11.6. The result of the optimization partitions of predators sub-community was 3.27,4.10~5.8,5.22~6.5 and 6.19~11.6.Study on the relationship of Cecidomyiidae and its natural enemies by grey theory, the result showed Anthocoridae,Coccinellidae,Theridiidae and Syrphidae were main enemies ofr Cecidomyiidae .