<正>在对洮河林区云杉、冷杉林分调查研究的基础上,探讨现实林分的结构、生长、更新、演替等规律。采用三种计算方法,推算了云杉、冷杉林分的择伐周期,结合经济、自然条件,分析论证云杉、冷杉林分的择伐周期以25年为宜,并据此提出了适宜的择伐强度、择伐径级、择伐量等技术指标。

Picea and abies forests in Taohe forest region have been investigated in order to find out the laws governing their structure, growth, rejuvenation and succession. Using three different kinds of calculation and taking economic and natural conditions into account, a reasonable selective cutting recycle of 25 years has been worked out. Technical indexes of selective cutting intensity, diameter class, and amount have also been subsequently calculated. According to the appraisal made, these indexes conform to reality and can be put into use.