论文部分内容阅读
一、前言我省有三千七百多万亩天然次生林,占全省森林总面积的72％。它不仅是重要的木材生产基地,而且还具有维护生态平衡等多方面公益效能。在森林演替上次生林一般都具有消退性的特点。所以在次生林中有很大一部分是林分质量较差的阔叶低产林。积极合理地改造这些低产林,才能大幅度提高林分质量,实现青山常在永续利用。在五十年代我省改造阔叶低产林主要是采取小面积皆伐的方法。往往由于伐区连片
I. Preface Our province has more than 37 million mu of natural secondary forests, accounting for 72% of the total forest area in the province. It is not only an important timber production base, but also has many benefits such as maintaining ecological balance. The succession of forest in the forest usually has the characteristics of regression. Therefore, a large part of the secondary forest is poor quality of the broad-leaved low-yield forest. Active and reasonable transformation of these low-yield forest, can significantly improve the quality of the forest, Castle Peak often sustainable use. In the 1950s, the method of rebuilding broad-leaved and low-yield forests in our province mainly adopted the method of small-area clear cutting. Often due to contiguous cutting area