The Compositions and Cluster Analysis of the Spider Community in the Stands of Pinus massoniana

Based on the data collected during the period of 1988~1990 in the stands of Pinns massoniana located in Qianshan County of Anhui Province, the compositions of the spider community were studied and the spider community of different stands were classified into groups in terms of Czekanowsiki-Sorensen's index of similiarity. The results indicate that the family of Araneidae is the most abundant in both species and individuals. There are 9 dominant species, of which Mecynogea sp. and Theridion pinastri are the most dominant ones and T. pinastri could adapt to a wider environments. Mixed stand and elevation of the stands have significant effects on the compositions of the spider community. From the hilly lands to mountainous areas, the similarity of spider community tends to decrease and the species tends to be more abundant.