A STUDY ON THE SUSTAINABLE POPULATION BASED ON THE WATERSHED ON THE THREE METROPORITAN AREAS IN JAPAN BY USING GIS

Abstract

Recently rapid increase of the world population and food demands become the global environmental problems. In our country, the population is now declining for the first time in 2005, but the self-support rate of food is in 20-30% and the extremely low situation. Therefore quantitative recognition for the population and distribution of them are very important for us. In this paper, Watershed Environmental Capacity (WEC) of Space based on watershed as an ecosystem was calculated on the Three Metropolitan Areas in Japan by using GIS. WEC of Space set it as quantitative relations between the present population and the self-sufficient population.