交互砂州河川の生態系サービスポテンシャル評価の試み

抄録

River landscape is composed of various landscape units which provide spaces to support elementary processes in biophilic elements cycle as well as habitats for various organisms. It is important to preserve and restore each landscape, based on evaluation to show which part of sand bars is definitely significant. Particularly the former is related to ecosystem service which is focused on now a day. The space to support elementary process of biophilic elements cycle has potential for ecosystem service (ESP=ecosystem service potential), though it is not uniquely related to products of ecosystem service which is brought about through series of elementary processes when the flux passes through that space. So we clearly distinguished the ecosystem service potential from ecosystem service in this paper. However the spaces in river are dynamic, which sometimes promoted and declined. Under such dynamic situation, landscapes with higher ecosystem service potential should be preserved and/or restored. After such discussions, we have firstly prepared the map with mosaics of landscape units through GIS technique by using aerial photos with assistance of the topographical survey data and hydraulic calculation. And then, “weighted usable area” for ecosystem service potential of each landscape is calculated. Finally we have recognized its temporal and spatial variability in the segment, and with those information, we discuss and propose how to apply the ecosystem service potential for river management.