粤北石漠化地区不同土地利用类型水流失研究

在粤北阳山县江英镇设计了祼地、耕地、草坡地3种类型的石漠化试验样地,现场观测降雨在上述3种样地所产生的径流量,分析粤北石漠化地区不同土地利用类型的水流失情况。结果表明,在粤北石漠化地区,绝大部分的雨水下渗成为土壤水和裂隙水,其中祼地的降雨有91.36%下渗,耕地的降雨有95.85%下渗,草坡地的降雨有97.53%下渗。地表径流量祼地>耕地>草坡地,草坡地地表径流深最小,其次为耕地,最大是祼地,说明草坡地对降雨截流的效果最好。

Study on water loss of different land use types in rocky desertification areas of northern Guangdong

Three types of rock desertification test plots,including the bare land,farmland,and grass slopes were designed in Jiangying town,Yangshan county,northern Guangdong.Through field observations of rainfall,water loss of the different land use types in rock desertification areas of northern Guangdong was analyzed.The results showed that most of the rain water infiltrated into soil water and fissure water in rocky desertification region of northern Guangdong,92.02% of which infiltrated in the bare land,96.75% of which infiltrated in the farmland and 98.35% of which infiltrated in the grass slopes.Sort of surface runoff was the bare land> farmland> grass slopes,surface runoff depth of the grass slopes was minimum,followed by farmland,and the largest was the bare land,which showed that the best effect on the rainfall closure was the grass slopes.