长江上游、黄河上中游坡改梯对其径流及生态环境的影响

EFFECTS OF SLOPING FIELDS TERRACED ON RUNOFF AND ECO-ENVIRONMENT IN UPPER REACHES OF YANGTSE RIVER AND IN UPPER AND MIDDLE REACHES OF YELLOW RIVER

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 。

Through the analysis of effects of terrace,the paper reveals that the sloping fields terraced project in upper reaches of Yangtse River and in upper and middle reaches of Yellow River caused the heightening in small cycle of water,weakening in large cycle of water and evolution of eco-environment.It is pointed out that terrace construction attribute to flood control and ecosystem reconstruction in the basin of Yangtse River and Yellow River.The relations between no-flow in Yellow River and terrace consturction is also probed.