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The ecosystem of the Earth provides resource and environment for
human beings to live and development. Resource and environment
are limited in the Earth. The quantity of population and their
activities are limited. In order to attain sustainable
development for human beings, the activities of people must be
limited under the carrying capacity of the Earth. Because of the
influence by elements and interactions in the ecosystem of the
Earth, the carrying capacity of the Earth is the main constraint
to sustainable development for human. Base on ecosystem''s
thinking, this study developed a method to evaluate the carrying
capacity for a river basin and offered the related information
to the decision-maker. For evaluated thecarrying capacity for a
river basin, this study defined the definition of the carrying
capacity at first. Secondly this study explicated ecosystem''s
framework. Thirdly this study used D-S-R (Driving force-State-
Response) construction to develop the evaluative method.
Finally, this study built an evaluative model and an evaluative
program to evaluate the carrying capacity for river basin. After
the program evaluated, this study could get the carrying
capacity for a river basin and the land-use type of the whole
watershed at the same time. This study used the model to
evaluate Chung-Kang River. The carrying capacity of Chung-Kang
River was about 111,159 population equivalents in the present
development based on some assumptions. The carrying capacity of
Chung-Kang River would be increased about 30% when the land-use
type of the river basin could be changed on ten percents
allocation rates. In addition, industrial waste minimization of
industrial process would increase the carrying capacity of
Chung-Kang River also.
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