Composition and niche of spider community in apple orchard

The composition and niche of spider community in apple orchard in central Shanxi are studied. The results show that the gathered 4447 spiders belong to 15 families, 41 genuses and 68 species. Applying the Berger-Parker(1974) index of dominant degree(d), the dominant species of spider community in orchard in different times are studied. According to fuzzy cluster analysis of two-dimensional overlap value and the similar index of species, eight kinds of spiders in apple trees are divided into two obvious competing species and three separated species(clustering threshold is λ＝0.89).