Abstract: By the method of principal component analysis, this paper analyzed the characteristic parameters of arthropod community and its phytophagous and predacious sub-communities in grapery. The results showed that in the first principal component, the contribution of arthropod community, phytophagous sub-community and predacious sub-community was 66.70%, 73.39% and 54.17%, respectively. For arthropod community, the absolute values of normalized regressive coefficients of individuals’ number N, Hill diversity index N₁, Hill diversity index N₂ and McIntosh index D_mc were larger, indicating their greater contribution on the community. For phytophagous sub-community, N, N₁, N₂, N and S (total species) had greater contribution; while for predacious sub-community, the greater contribution was made by N₁, N₂, Shannon-Wiener diversity index H'and abundance R. Synthetically, N₂ and N₁ had greater contribution on the arthropod community and its phytophagous and predacious sub-communities in grapery, comparing with other characteristic parameters.

Key words: Leafy vegetable, Arthropod, Diversity, Sampling technology, Critcal number of samples