森林節足動物の密度および現存量の推定方法について

抄録

The smoke of γ-BHC was used to estimate the density and the biomass of forest arthropods. The problem of determining the number of quadrats is considered in this paper. A six meter by six meter quadrat consisting of 36 units of 1 m^2 vinyl sheets was set up in a beech stand of the Ashu Experimental Forest of Kyoto University in Kyoto Prefecture in May and July of 1965. On one calm morning five containers of γ-BHC were made to smoke. The arthropods fell and died on the sheets and were collected. The minimum unit area and its size were calculated by the application of the statistical theory to estimate the density and the biomass of the arthropods. As for the density, if 20 units of 1 m^2 were used, the values 20 per cent of fiducial limits to the average on 95 per cent confidence can be obtained. The variance in the biomass, however, was somewhat larger than that in the density, so a larger area is required to get the values of the above mentioned. It was estimated to be 30-50 m^2.