砒砂岩沟谷种植沙棘林防止土壤重力侵蚀的实践

黄河中游的砒砂岩区是我国土壤侵蚀最为严重的地区之一,也是黄河下游河道淤积物中粗泥沙的集中来源区之一。该区严重的重力侵蚀,构成了流域产沙的主体,并为水力侵蚀提供了丰富的泥沙来源。1999—2008年在砒砂岩裸露沟谷地段种植的沙棘林保存面积达1 642.86 km2,较好地减弱或消除了产生表层碎屑层的水热条件,起到了很好的拦截泻溜作用。据估算,砒砂岩区目前人工沙棘林平均减少的土壤侵蚀模数(重力)为4 833 t/(km2.a),年可减少土壤重力侵蚀量达741万t,为减少入黄粗泥沙发挥了很好的作用。

Practice on Planting Hippophae rhamnoides in Soft Sandstone Gullies for Preventing Gravity Erosion

The soft sandstone region located on middle reaches of the Yellow River is not only one of the most serious soil erosion areas in China,but also one of concentrated source areas of coarse sand of channel sedimentation in the lower Yellow River.The severe gravity erosion of the area has formed the main part of sediment yield of the Yellow River Basin and provided abundant source of sediment for hydraulic erosion.During the period of 1999 to 2008,the reserved area of Hippophae rhamnoides planted at the expose...