退耕地不同植被恢复模式对坡面径流的影响

Influences of Different Vegetation Restoration Patterns on Slope Runoff

建立坡面径流观测场,对洪雅县低山区退耕还林中几种植被恢复模式进行了定点观测。结果表明:1)该区域产生坡面地表径流最根本的原因是土地的耕作与否;2)林+草、竹+草种植模式的地表径流特征既不同于农耕地,又与未被扰动的生态林植被相差较大,受人为经营影响较大;3)退耕还林初期植被-土壤系统调蓄降雨能力尚较弱。进一步研究和完善林+草、竹+草的生态经营技术体系,提高该类退耕种植植被恢复模式的调蓄降雨能力,对指导退耕还林及植被经营有重要的意义。

Observations were made at fixed sites of several vegetation restoration patterns by establishing runoff plots in the low-mountain area of converting slope farmland into forest(CSFF) in Liujiang Town,Hongya County.The findings were as follows:1)Tilling or no tilling was the key reason for whether slope runoff would occur in this area;2)The rain wash features of tree+grass,bamboo+grass are vegetation restoration patterns were not the same as those of farmland,and also much different from ecological forest restoration.They were deeply influenced by human management;3)The capacity of rainfall regulation was still weak in the early days of CSFF.Further studies about the ecological management techniques of tree+grass,bamboo+grass are needed so as to promote the rainfall regulation capacity of vegetation restoration patterns,the engineering of converting farmland into forest.