摘要
【目的】以冀北山地蒙古栎天然次生林(35年生)为研究对象,探究不同间伐强度下植被因子对地表产流和土壤侵蚀的影响。【方法】设置5个间伐强度,采用径流小区法对不同间伐强度的地表径流、土壤侵蚀特征进行监测分析,利用灰色关联法对产流、产沙的影响因素进行关联度分析。【结果】1)2016和2017年各间伐强度产流特征均呈现:25%间伐强度> 20%间伐强度> 50%间伐强度>对照> 30%间伐强度> 40%间伐强度,最大和最小产流差值在3.6 m^3/hm^2左右。2)2016年和2017年各间伐强度产沙特征略有不同,但都表现为50%间伐强度产沙量最大,与最小产沙量差值分别为6.38和3.11 kg/hm^2,20%间伐强度产沙量次之,25%、30%和40%间伐强度产沙量较少。3)灰色关联分析得出,除降水外,各影响因素对于产流影响大小依次为:郁闭度>枯落物厚度>林分密度>冠幅>灌草层盖度,对于产沙影响大小依次为:林分密度>枯落物厚度>冠幅>郁闭度>灌草层盖度。【结论】本区蒙古栎天然次生林水土保持效果较好,不同间伐强度土壤侵蚀模数变化范围为0.21~0.85 t/(hm^2·a),研究表明林分结构因子在本区蒙古栎天然次生林水源涵养中起主导作用,间伐抚育主要是通过林分结构的改变,改善林地水土保持的效果。
【Objective】In the present study,we investigated the influence of vegetation factorsof different thinning on Runoff and Sediment Yieldbasedon runoff observations.【Method】Five different thinning regimes and a no-thinning(control)treatment were established in middle-aged(35 years old)Quercus mongolica secondary forests in north mountain area of Hebei.Runoff data of two years after thinning were recorded,grey correlation method were used to estimate the correlation coefficientof vegetation factorson runoff and sediment yield.【Result】1)In 2016 and 2017,the affecting sequence of runoff of each thinning intensity is 25%>20%>50%>control>30%>40%,maximum and minimum difference is about 3.6 m3/hm^2.2)Although the affecting sequence of sediment yield varied slightly in 2016 and 2017,the sediment yield of 50%thinning intensity are the biggest,which exceed minimum 6.38 and 3.11 m^3/hm^2 respectively,20% thinning intensity comes second,and there are few sediment yield on 25%、30% and 40%.3)Grey correlation analysis gets the result that impact on runoff,rainfall>canopy density>litter thickness>stand density>crown width>coverage of shrub-grass,while on sediment yield,rainfall>stand density>litterstorage>crown width>canopy density>coverage of shrub-grass.【Conclusion】Quercus mongolica secondary forest in this area has a better soil and water conservation effect,the soil erosion modulus of each thinning intensity within the variation range from 0.21 t/(hm^2.a)to 0.85 t/(hm^2.a).The results shows that forest structure factors play a leading role in the evaluation of water conservation in the study area,the thinning will help the water and soil conservation by changing forest structure.
作者
尤海舟
孙浩伦
王立方
吴树琴
YOU Haizhou;SUN Haolun;WANG Lifang;WU Shuqin(Hebei Institute of Forestry Science,Shijiazhuang 050061,Hebei,China;Hebei Xiaowutai Forestry Ecosystem Research Station,Zhuolu 075600,Hebei,China;Hebei Engineering Research Center for Trees Varieties,Shijiazhuang 050061,Hebei,China;Luanping State-owned Forest Farm Management Office,Chengde 068250,Hebei,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2020年第3期105-110,共6页
Journal of Central South University of Forestry & Technology
基金
河北省重点研发项目（2018106451-2）
河北省科技计划项目（11240615D）
河北省林业科技计划项目（1701484）
关键词
间伐强度
蒙古栎次生林
产流量
产沙量
thinning intensity
Quercus mongolica secondary forests
runoff
sediment yield
