【摘要】 杨桦林是吉林省主要的次生林类型,喜光耐寒,林相良好,蓄积量大。杨桦林叶面积指数比柞林大,生长迅速,生产力高,具有多种生态经济效益,是纸浆、胶合板、火柴杆的好原料,也是涵养水源,保持水土的好林分。经营措施,应依据林种和经营目的而定。更多还原

【Abstract】 Poplar and Birch stands are the main type of secondary in Jilin province. This type is light demand winter resistance, forest aspect fine forest physiognomy large amount of volume. Poplar and Birch forest Leaf-area is bigger Than That of Oak stand, fast growing high productioity. There are much ecological benefit Poplar and Birch forest are the good materials of wood-pulp,glue-board, and the match stock. It is good forest type for conservation of water supply. The treatment should be based on the object of the aim of management更多还原