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前言长白山天然林区,过伐林(原始林经过不合理采伐破坏以后,残留下来的林木,仍构成一个林层,保持一定的疏密度(0.3—不包括下层次生的林木)或郁闭度(0.4)的林分,称为过伐林)的面积占森林总面积的20%左右。为了解决过伐林的合理经营问题,1964年东北、内蒙地区次生林科研会战组在吉林省吉林、通化和延边3个地区7个有代表性的国营林场搜集了大量资料,对过伐林主要类型的林分结构和生产力等方面的特点进行了分析,并在此基础上提出了相应的采伐方式
Foreword Changbai Mountain natural forest area, over-cutting forest (after the original forest was destroyed by unreasonable logging, the remaining trees still form a forest layer, maintaining a certain degree of density (0.3 - excluding secondary forest) or canopy density (0.4) or over-deforestation) accounts for about 20% of the total forest area. In order to solve the problem of rational management of over-cutting forests, the secondary forestry research team of Northeast China and Inner Mongolia in 1964 collected a large amount of data from 7 representative state-owned forest farms in three districts of Jilin, Tonghua and Yanbian in Jilin Province, Forest structure and productivity of the characteristics were analyzed, and on the basis of the proposed harvesting methods