广东省水土流失的生物治理途径

治理广东省水土流失的指导原则是水利工程措施与生物措施相结合。治理崩岗的技术经验是改进修坡技术;充分利用植物资源;实行草木并举,以草保树促林;实施促生长措施,用“以快制胜”技术战略实现植被覆盖。

The Surface Erosion and Fluvial Silt in the Upper Reaches of Changjiang River

The surface erosion and fluvial silt in upper reaches of Changjiang River were analyzed systematically. It was considered that the development of surface erosion in upper Changjiang was affected by unreasonable social economic activities such as the agricultural cultivation, forest and prairie exploitation,roads building,and capital construction and so on which enlarges the area of soil and water loss in upper Changjiang River. The author also analyzed and forecasted that the erosion amount would reduce to 1.022 billion tons from present 1.568 billion tons in the end of this century based on recent steps. By regional forecasting the effect of surface erosion on fluvial silt, it was believed that the surface erosion could be reduced largely by harness the upper Changjiang River,but the fluvial silt may be not changed a lot. The silt amount of water carry will range from 0.488 to 0.502 billion tons at Yichang hydrometric station in 2000.