【摘要】 以21年生杉木近熟林为研究对象,设置间伐(T,间伐强度约为45%)、对照(CK,不间伐)2种处理,每种处理重复3次,分别于2018年初春和2021年初春进行调查,分析抚育间伐对林木生长和土壤物理性质的影响。结果表明:抚育间伐后林木的径阶分布明显向右偏移,大径级林木的比例明显提高;未间伐林分林木的径阶分布符合正态分布,间伐林分的偏离了正态分布。抚育间伐能够促进林木的胸径生长,林木平均胸径年生长量在CK和T间存在显著性差异(P<0.05);抚育间伐对树高生长和林分蓄积量的影响均不显著(P>0.05);抚育间伐能够促进林木单株材积的生长,单株材积年生长量在CK与T间存在显著差异(P<0.05)。抚育间伐可以显著改善0～20 cm土层土壤物理性质,使土壤容重降低,土壤毛管持水量、土壤毛管孔隙度和土壤总孔隙度增加,在CK和T间,土壤容重、土壤毛管持水量、土壤毛管孔隙度和土壤总孔隙度均存在显著差异(P<0.05),但抚育间伐对土壤物理性质改善作用随土层深度的增加而降低,20～40 cm、40～60 cm土层土壤的以上各指标大多数在CK和T间无显著差异(P>0.05)。更多还原

【Abstract】 Taking 21-year-old Chinese fir near-mature forest as the research object, two treatments thinning(T, thinning intensity was about 45%) and control(CK, no thinning)were investigated, and each treatment was carried out in triple. The investigation was carried out in the early spring of 2018 and the early spring of 2021 respectively, to observe the effect of trending thinning on tree growth and soil physical properties. The results showed that after trending thinning, the diameter class distribution of trees significantly shifted to the right, and the number of large diameter class trees per unit area increased. The diameter class distribution of trees in non-thinning stands conformed to the normal distribution, and the thinning stands deviated from the normal distribution.Trending thinning can promote the DBH growth of trees, while there is a significant difference in the average annual DBH growth between CK and T( P<0.05).The effect of trending thinning on tree height growth and stand volume was not significant(P>0.05).Trending thinning can promoted the growth of individual Meanwhile, tree volume, and the annual growth of individual tree volume was significantly different between CK and T(P<0.05).Meanuhile, trending thinning can significantly improve soil physical properties in 0～20 cm soil layer, reduce soil bulk density, and increase capillary water holding capacity, capillary porosity and total soil porosity. There were significant differences in soil bulk density, capillary water holding capacity, capillary porosity and total soil porosity between CK and T( P< 0.05).However, the improvement effect of thinning on soil physical properties was decreased with the increase of soil depth. Most of the above indexes in 20～40 cm and 40～60 cm soil layers were not significantly different between CK and T( P > 0.05).更多还原