摘要
该文以江西省大岗山的人工杉木林为研究对象,分析间伐对水土流失的影响。结果表明:①间伐后,林下植被发展迅速,覆盖度增加,径流系数较未间伐的林地小,未间伐林地的径流系数是间伐林地的4.67倍;②随着时间的发展,同一样地的降雨产流量与1次降雨量3、0 min降雨强度、60 min降雨强度的相关关系降低,间伐样地的上述相关关系比未间伐样地的更弱;③间伐样地的径流含沙率明显低于未间伐样地。④适度间伐虽然降低了林分的郁闭度,削弱了林冠的截留率,但是林下植被的迅速发展,使得林分整体的蓄水和保土效益明显增加。
The effects of fir plantation thinning on soil and water loss in Mt.Dagangshan are studied.The results show that： 1） The coverage of undergrowth is increased rapidly after thinning and the runoff coefficient of the un-thinning plots is 4.67 times as much as that of the thinning plots;②The correlativities of rainfall runoff yield and rainfall amount,precipitation intensity of 30 minutes and 60 minutes in the same plot have a decreasing trend as times go on;the correlativity of thinning plots is weaker than that of the un-thinning plots;③The sediment rate of thinning plots is apparently lower than that of the un-thinning plots.Although proper thinning diminishs the canopy density and weakens the canopy interception rate,the under-canopy vegetation is developed quickly and the overall water and soil conservation benefits of the forest stands are increased.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2008年第3期120-123,共4页
Journal of Beijing Forestry University
基金
“十一五”国家科技支撑计划课题(2006BAD24B0302)
关键词
间伐
降雨特征参数
径流系数
产流量
含沙率
thinning
rainfall characteristic parameter
runoff coefficient
runoff yield
sediment rate
