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杨桦柞次生林,在我国东北林区有着广泛分布,如何将这些低价林加以抚育改造与利用,进而达到扩大森林资源,实现永续利用之目的,是当前森林经营工作中的一个重要问题。一、杨桦柞次生林的概况(一) 次生林的成因和发展趋向次生林是由于原有的红松阔叶林,经受掠
The secondary forest of Betula alnus is widely distributed in northeastern China. How to rebuild and utilize these low-cost forests so as to expand forest resources and achieve sustainable use is an important issue in current forest management. I. Overview of the secondary forest of Betula alnus (I) The origin and development trend of secondary forest The secondary forest is due to the existing Korean pine broad-leaved forest,