小流域森林植被冠层对降雨侵蚀力减缓研究

降雨是影响土壤侵蚀的主要因素之一，降雨侵蚀力反映了降雨对土壤侵蚀的潜在能力；森林植被对土壤侵蚀具有减缓作用。本文通过气象观测站与标准径流小区的试验观测，系统地分析了赣西北大坑小流域森林植被冠层对降雨侵蚀力的影响，结果表明：①不同林分林冠截留率不同，其中杉木林平均截留率为25．82％，马尾松林为19．63％，檀木为21．13％；②不同林分减缓降雨侵蚀力的作用是不同的，其中马尾松林〉杉木林；③灌木林在减弱降雨侵蚀力作用中占有特殊重要的作用，本研究中檀木林减缓降雨侵蚀力为22％-27％，平均为25％，远远大于乔木林。

Release Effects of Vegetation Canopy on Rainfall Erosivity in Small Watershed

Rainfall is one of main factors affecting soil erosion.Its erosivity shows the potential ability of the soil loss caused by rainfall.Rainfall erosivity is a very important factor for predicting soil loss from agricultural hillslopes.This paper analyzed the effects of vegetation on rainfall erosivity in Dakeng small watershed in northwest of Jiangxi province.The results showed that there are different canopy interception rate and release effects from different standing forest.Release effects of scrub on rainfall erosivity are bigger than that of arbor.