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This paper studied the differences of the diversity, abundance and evenness of arthropod community and sub-community in cotton field among treatments haloxyfor-k (A), paraquat (B) and contrast (CK). The results showed that in the diversity of phytophagous sub-community, tA-CK = 3.099 and tB-CK = 2.449 (tt0.05 = 2.228), the difference being significant, and in the diversity of predatory sub-community, tA-B = 2.260 and tA-CK = 2.377 (tt0.05 = 2.228), the difference being also significant. In the arthropod community and sub-community, no significant difference was found for A-CK, B-CK and A-B. The abundance of arthropod community tA- CK = 4.359, and that of phytophagous sub-community tA-CK = 2.963, the effect being all significant (tt0.05 = 2.228). No significant difference was found in the evenness of arthropod community and sub-community for A-B, A-CK and B-CK. The biodiversity had the same change trend for treatments haloxyfor-R (A) paraquat (B) and contrast (CK).

Based on the principles of community ecology and by the method of fuzzy clustering, this paper studied the temporal and quantitative dynamics of the arthropod community and sub-community in megranate orchard, aimed to utilize natural enemy resources for pests control. The results showed that both of total community and natural enemy sub-community could be grouped into 4 clusters, and non-natural enemy sub-community could be grouped into 3 clusters. This clustering reflected the complexity of the community structure. The optimal cut-apart could divide the total community and sub-community into 3 stages, i. e., April-August, September-October, and November.

This study showed that the diversity index of total arthropod community in peach orchards was significantly correlated to the diversity index of both phytophages (r = 0.9480) and predators sub-communities (r = 0.7855), and the two sub-communities were correlative (r = 0.6741). It was also significantly correlated to the evenness index of total community (r = 0.7870), but not correlated to the evenness index of both sub-communities. The diversity index (H') of total community was significantly correlated to the ratio of predators individuals (Sd) and phytophages individuals (Sz) (r = 0.8112) and of species (Ss) and individuals (Si) (r = 0.9188), but not correlated to the ratio of predators (Spl) and phytophages (Szl).