间伐对红松人工林土壤物理性质的影响

Effects of thinning on physical properties of soil in Pinus koraiensis plantation

以红松人工林为对象，共设弱度、中度、强度和对照（自然稀疏）4种间伐处理，对其下土壤物理性质进行研究。结果表明：间伐处理土壤容重低于对照，0~20cm土层降幅达1.36%~13.46%；土壤孔隙度和入渗系数高于对照，其中，0~20cm土层土壤总孔隙度、毛管孔隙度、非毛管孔隙度分别增加了0.83%~11.42%、0.50%~9.08%、0.76%~2.34%，土壤入渗系数是对照的2.81~4.99倍。就土壤剖面分布特征看，除土壤非毛管孔隙度外，各处理、各指标均以0~20cm层为最大。综上认为，对红松人工林进行适当的间伐作业有利于改善土壤物理性状，仅就本研究来说，中度和强度间伐效果最佳。

In Pinus koraiensis plantation,four degrees of thinning treatment:low degree,middle degree,intense degree and control(natural thinning)were arranged,and the physical properties of soil were studied. The results showed that:in middle thinning treatment,soil bulk density was lower than that of control,and reduced 1.36%~13.46% in 0-20cm soil layer;soil porosity and permeability coefficient were higher than that of control. Of these,in 0-20cm soil layer,total soil porosity,capillary porosity and non-capillary porosity increased 0.83%~11.42%、0.50%~9.08%、0.76%~2.34% respectively,and soil permeability coefficient of middle thinning treatment was 2.81~4.99 times of control.As to distribution structures in soil profile,in each treatment,except non-capillary porosity,the other indexes were all biggest in 0-20 soil layer. Above all,suitable thinning treatments would contribute to improve soil physical properties. For this study,middle degree and intense degree of thinning could achieve the best result.