Abstract
Toward the sustainable landuse in the Toki-Shonai River Basin, evaluation system for grasping the characteristics of biodiversity in the river basin, linking among the different spatial scales of landscape, ecosystem and habitat, is constructed in this paper. Biodiversity zoning in the river basin was proposed by balancing the spatial relationship between potential species diversity and the potential habitat of indigenous species (Nepa hoffmanni) with the classification of the environment compositions in minimum catchment areas. It was clarified that the distribution of gravel layer with older stratums in Satoyama area affects the spatial coexistence and gaps between the indigenity of the ecosystem and its species diversity. As the application to the spatial planning, environmental zoning and its guideline for the conservation and the restoration of indigenous habitats, including the strategic mitigation of the influences from developments by using SI/HSI models, are considered as the practical methodology for the biodiversity management in the whole river basin.
