九华山土壤螨类的生态分布

本文对九华山４种生境土壤螨类进行了调查研究。获标本５８０５个，分隶４亚目。其中甲螨亚目占个体总数的６５％，属４２科６２属６３种，新种１种，平均密度３６６５个／ｍ２。土层（０－２０ｃｍ）中甲螨优势种是Ｘｙｌｏｂａｔｅｓ ｔｅｎｕｉｓ、Ｓｃｈｅｌｏｒｉｂａｔｅｓ ｌａｔｉｐｅｓ；枯枝落叶层（Ａ００）以Ｇａｌｕｎｍａ ｓｐ．最多，土层中有些常见种在Ａ００层并未出现。４种生镜甲螨组分化较大，仅见于一种生交

THE ECOLOGICAL DISTRIBUTION OF SOIL MITES IN JIUHUA MOUNTAINS

in this paper, the soil mites of four habitates.in Jiuhua mountaints are investigated and studied. 5805 spedments which belong to 4 suboders were collected. Oribatied mites ac count for 65% of the total individuals, and they belong to 42 families, 62 genera and 63 species, of which 1 is a new one to science. The average density is 3665 individuals/m3. Xylobates tenuis, scheloribates latipes are the dominant species in 0-20 cm deepth of soil layer.Galunma sp. is the most abundant species in the litter layer(A00). Some common species seem to be disappeared in layer A00. It is quite clear to divide the oribatid mites' composition in 4 habitates, 28 species(genera) could be found only in one habitat. The species richness and quantity decrease with the altitude increas generally, except that masson pine forest is reduced because of the human activities. The highest composition similiarity is found between the two kinds of pine forests, while the lowest between masson pine and meadow forest. Important in dexes, such as S, N,D, H, E, vary obviously with seasons. A common phenomenon is De cember> October> April > August, contrary to the community of temperate forest. Oribatid mites congregate to the surface horizon, and remain unchanged in winter.