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通过对梯田的蓄水拦沙效应、坡改梯水分小循环与河川径流大循环的关系、坡改梯对其生态环境演变影响的分析 ,指出长江上游、黄河上中游的坡改梯增强了水分小循环 ,造成入河水沙量的削减 ,其中减水 ,有利于长江、黄河汛期的防洪减灾 ;减沙 ,缓减了长江、黄河河道及湖泊水库泥沙的淤积 ,为其流域治理与生态恢复创造有利条件 ;在黄河上中流域 ,减水造成入黄径流量的减少 ,也促成了断流现象的发生
Based on the analysis of the effect of water storage and sand trapping, the relationship between the small water cycle of slope improvement and the large circulation of river runoff, and the influence of slope alteration on the evolution of ecological environment, it is pointed out that the slope alteration in the upper reaches of the Yangtze River and the upper reaches of Yellow River enhances the water Small cycles lead to the reduction of water and sediment into the river. Water reduction is beneficial to flood control and flood mitigation in the Yangtze River and Yellow River flood season. Sediment mitigation reduces sediment deposition in the Yangtze River, Yellow River and lakes and reservoirs, Create favorable conditions; in the upper basin of the Yellow River, water reduction led to a decrease of yellow runoff, also contributed to the occurrence of the cut-off phenomenon