抚育间伐对紫椴人工林生长的影响

Effects of thinning on the growth of Tilia amurensis plantation

为探索不同间伐强度对紫椴人工林生长的影响,以30年生紫椴人工林为研究对象,进行20%(T 20)、30%(T 30)、45%(T 45)和65%(T 65)4个间伐强度处理。结果表明,不同抚育间伐处理林分胸径、树高及单株材积生长均高于对照样地,随着抚育间伐强度的增加,林分胸径、树高、单株材积生长量均呈现先增后减的趋势,各项指标生长量由高到低的顺序为T 45﹥T 30﹥T 65﹥T 20﹥CK;抚育间伐增加了大径级林木的株数,随着抚育间伐强度的增加,大径级林木所占比例上升;抚育间伐提高了单株材积,但样地内林木总株树的下降,导致各抚育间伐样地林分蓄积生长量都低于对照样地。

Study was carried out in 30-year-old Tilia amurensis plantation to explore the effect of different thinning in-tensities on plantation growth.4 thinning intensities 20%(T 20)、30%(T 30)、45%(T 45)and 65%(T 65)were set.The results showed that the growth of DBH,tree height and individual volume in thinning treatments was better than that in control plot.With the increase of thinning intensity,growth of DBH,tree height and volume increased firstly and then decreased,and the indexes in each treatment ranked as follow:T 45﹥T 30﹥T 65﹥T 20﹥CK.Tending and thinning increased the number of trees with large diameter.With the increase of thinning intensity,the proportion of large diameter trees increased.Tending and thinning increased the individual volume,but due to the decrease of total number of trees in the sample plot,the stand volume increasement of each thinning plot was lower than that of the control plot.