多摩地域におけるダニ・トビムシ類の個体数, 種組成と林相および土壌との関連

抄録

Density and species composition of Acarina and Collembola in brown forest soils in a plantation of Cryptomeria japonica D.Don, a secondary forest of Quercus serrata THUNB., and in a natural forest of Fagus crenata BLUME were surveyed 4 times a year. A_0 layer and mineral soil layer were sampled separately, and the properties of the soil samples after extraction of microarthropods were surveyed. The fluctuation patterns in density of Acarina and Collembola in A_0 layers in the three forests were different from those in mineral soil layers. Density of microarthropods in mineral soil layers highly correlated to the carbon contents of the soil. The similarity index (Morisita's Cλ) of the genus composition of Cryptostigmata was highest (0.75) between the Fagus forest and the Quercus forest, while lowest (0.54) between the Quercus forest and the Cryptomeria plantation. The fluctuation patterns in the number/m^2 of Cryptostigmata in the three forests were similar to one another. Cλ indexes of the species composition of Collembola were relatively low (0.40-0.44) among the three forests, and the fluctuation patterns in the number/m^2 of Collembola in the three forests were different from one another.