实施水土保持措施后的经济效益,可用投入与收益相比较来计算,对于不能以货币形态直接表现的生态效益,我们可以选择生境改善的主要指标予以综合反映。按照生态学的观点,自然界各地域由于环境条件的差异和植物种类适应性不同,在一定地段的自然条件下,总是由一定的植物种类结合在一起,一般概括地称为植物群落。植物群落的结构及其演替动态,又是群落内植物间、寄居在内的动 The economic benefits after the implementation of soil and water conservation measures can be calculated by comparing inputs and returns. For the ecological benefits that can not be directly manifested in the form of currency, we can select the main indicators for improving habitats to be comprehensively reflected. According to the ecological point of view, due to the difference of environmental conditions and the adaptability of plant species, the natural regions are always combined by certain plant species under the natural conditions of a certain section, and are generally generally referred to as plant communities. Plant community structure and its succession dynamics, but also within the community plants, siting within the move