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胡枝子水流调节林带具有显著的阻滞地表径流作用 ,林带宽度为 2 m ,间距为 3 0 m( 3°坡耕地 )、2 2 .5 m ( 5°坡耕地 ) ,可降低流速 2 3 .91%和 2 6.3 4 %;对提高水份入渗具有显著作用 ;对提高表层土壤抗冲性具有显著作用 ,胡枝子林带内表层土壤冲刷系数值只是对照坡耕地的 2 0 .3～ 2 3 .9%,林带控制的坡耕地冲刷系数值亦明显低于对照坡耕地。同时 ,具有显著的保土作用 ,保土率达 70 %以上 ,且有减缓田面坡度的作用
Lespedeza bidentata flow control forest belt has obvious effect of blocking surface runoff. The forest belt width is 2 m, the spacing is 3 0 m (3 ° slope farmland), 22.5 m (5 ° slope farmland), and the flow rate can be reduced by 23 .91% and 2 6.34%, respectively. It had a significant effect on increasing water infiltration, and had a significant effect on improving the anti-scourability of topsoil. The surface soil erosion coefficient of Lespedeza bicornis was only 20.3 ~ 2 3 .9%. The scouring coefficient of slope farmland controlled by forest belt was also significantly lower than that of the control slope farmland. At the same time, it has a significant role of protecting the soil and preserving the soil more than 70%, and has the effect of reducing the slope of the farmland