间伐强度对油松人工林生长的影响

Effects of Thinning Intensity on the Growth of Pinus tabuliformis plantations

本文对油松人工幼龄林采用强度(50%)、中度(35%)、轻度(20%)间伐,以未处理作对照进行了试验研究,结果表明:中度间伐对促进树木高生长的效果最为明显;间伐强度越大,胸径和单株材积也随着增大;林分单位面积蓄积量与单株材积、单位面积林木数量有关,间伐后前几年虽然单株材积增大,但是由于单位面积林木数量低,单位面积蓄积量也比较低,随着间伐后年限的延长,仅强度间伐在5年后单位面积蓄积量才超越对照。

In this paper,the severe(50%),moderate(35%)and mild(20%)thinning were used in the artificial young forests of Pinus tabuliformis,the experimental study was carried out with unthinning as the control.The results showed that the effect of medium-intensity thinning on the height growth was the most obvious,and the greater the intensity of thinning,the greater the DBH and the individual volume.The accumulation volume of per unit area was related to the individual volume and the number of trees in per unit area,although the individual volume increased in the first few years after thinning,however,due to the low number of trees per unit area,accumulation volume was also relatively low.With the extension of the years after thinning,only the accumulation volume per unit area of severe thinning exceeded unthinning after 5years.