三峡库区生态环境与农业持续发展

三峡库区系指出从重庆到宜昌段为水库波及的２０个县市。该区属川东陵谷区，以山地丘陵为主，河谷平坝比重小，种植业垂直分异明显，海拔５００ｍ以下的三熟制区，８００￣１４００ｍ为一熟制区，两区间系两熟制区。

ECO ENVIRONMENT AND AGRICULTURAL SUSTAINABLE DEVELOPMENT IN THREE GORGE RESERVOIR AREA

Three gorge reservoir area generally includes 20 counties or cities which are involved in the reservoir from Chongqing city to Yichang city. This region belongs to hilly area of east Sichuan province where mountains and hills are dominant, and valleys and flatlands take a low proportion, plantation appears obvious vertical differentiation, i.e. tripple cropping areas are below 500 m a.s.l., single cropping areas are distributed from 800 m to 1 400 m a.s.l., and between the two areas are double cropping areas. Because of the widespread population pressure, deforestation and reclamation, vegetation cover degree decreases markedly, slope cultivated lands increase, water and soil loss are very serious, crop yields are low and unstable, eco environment is in a state of degradation. Well cultivated lands below 200 m a.s.l. will be submerged by building the reservoir, while migration of settlers. and city or town moving and construction need large land area, so human land and human grain relationships will become more and more tense. Under the condition of shortage of reserve agricultural land resources, in order to build an economic region with developed economy and fine environment, we should grasp eco environment construction and agricultural sustainable development, and take appropriate measures.