森林植被冠层对降雨侵蚀力的减缓效应

Release effects of forest canopy on rainfall erosivity

通过气象观测站与标准径流小区的试验观测,系统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%,檵木为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具有特殊重要的作用,本研究中檵木林使降雨侵蚀力下降21.96%,远远大于乔木林。

Based on data obtained from the meteorological station and standard watershed established in Dakeng, the effects of forest canopy on rainfall erosivity were investigated in the northwest Jiangxi. The results showed as follows. （1） The canopy interception rate differentiated among the stands, with the average canopy interception rate of 25.82% for Chinese fir （ Cunninghamia lanceola- ta） , 19.63% for masson pine （ Pinus massoniana）, and 21.3% for Chinese loropetalum （ Loropetalum chinense）. （2） The release effects of masson pine forest on rainfall erosivity was more significant than Chinese fir stand. （3） The shrub stand played a critical role in alleviating rainfall erosion, reducing eresivity by 21.96%.