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以南小河沟为例，评价了水土保持工程措施、生物措施和生产力水平提高过程对流域水分环境条件的影响．结果发现南小河沟流域水环境在近５０年内发生了很大变化，坡面年总汇流量由治理前的１５．８３ｍｍ逐步减小为５．１６ｍｍ和现在的３．６６ｍｍ，未来１０年可能减到２．８６ｍｍ；塬面产流量却因庭院和道路面积增加以及建筑风格提高而逐步增大；坡地和沟谷的产流量逐步减小．同时生产力水平的提高进一步加强了水分小循环，削弱了水文大循环，改变了流域水均衡要素的定量分配
Taking Xiaohegou of South China as an example, the impact of engineering practices, biological measures and productivity improvement on the water environment in the watershed was evaluated. The results show that the water environment in Nanxiaohegou Watershed has changed greatly in recent 50 years. Total annual annual confluence of the slope surface is gradually reduced from 15.83mm before treatment to 5.16mm and now 3.66mm, which may be reduced to 2 in the next 10 years .86mm; the runoff on the plateau increased gradually due to the increase of the courtyard and road area and the improvement of the architectural style; and the flow rate of the slope and the valleys gradually decreased. At the same time, the improvement of productivity will further strengthen the small-scale water cycle, weaken the large-scale hydrological cycle and change the quantitative allocation of water balance in the basin