【摘要】 以安溪官桥为研究区,在已有研究工作的基础上采取野外调查与人工降雨野外模拟试验相结合的方法,研究了植被对山坡地土壤侵蚀的调控机理.研究表明,翻耕地在生草覆盖的条件下,产流量与径流系数均减少70%左右,平均入渗率提高3倍多.说明生草覆盖条件下大量的降雨以入渗的形式流入土壤中,且径流含沙量与产流产沙量均显著低于生草覆盖前,其中平均含沙量减少87.5%,产沙量减少97%.根据对野外试验小区的多年观察,说明植物篱具有缓解坡度、提高土壤抗冲性等明显的保水保土效益.因此,采取适当措施减少产流量以及提高降雨向土壤水分的转化率,均可有效减少坡地土壤流失量.更多还原

【Abstract】 Taking Guanqiao area in Anxi county as study area and based on previous research achievements,this article assessed systematically the mechanism of vegetation in adjusting and controlling soil erosion on the slope lands by integrating field investigation and experiments.The results showed that,under grass cover conditions,either runoff-yielding volume or runoff coefficient reduced by 70% while the average rate of infiltration increased by more than 3 times respectively on the tillage,which proved that a large amount of rainfall had flowed into soil in the form of infiltration.In addition,both the surface flow′s sediment concentration and runoff-sediment-yielding reduced obviously under the conditions of grass cover,for example,the average sediment concentration in lost runoff decreased by 87.5%,and sediment-yielding amount decreased by 97%,indicating that the perennial alfalfa hedgerow system would be effective.And in the light of the observation in the fields for many years,it was proved that the hedgerow system has obvious effects on soil and water conservation.So the applications of suitable measures to reduce runoff-yielding volume and increase the transformation ratio from rainfall to soil water will be effective in reducing soil loss from sloping fields in the area.更多还原