Taking Zhifanggou watershed for an example,this paper aims to design an evaluation index system for agricultural ecology security in the loess hill and gully region.The developing course of eco-economic sys- tem is divided into 4 stages according to the conditions of agricultural ecology security in nearly 70 years. Then the authors discuss the main factors which affect agricultural ecology security and obtain a series of e- valuation indexes by analyzing the 4 stages.The evaluation indexes are selected,cla...
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