抚育改造次生林的前提首先是把这些林分划分为不同的类型,然后对不同的类型采取相应的经营措施。因此划分类型应视为次生林经营的首要问题。目前划分次生林类型有三种方法:一、按森林植被型划分,是一种按生物地理群落(苏卡乔夫)划分林型的方法。我国的次生林大多是在历史上经破坏后,又重新形成的。因此,森林植被 Tending the transformation of secondary forests, the premise is to divide these forest types into different types, and then take corresponding management measures for different types. Therefore, the type of division should be considered as the primary issue of secondary forest management. At present, there are three methods for the classification of secondary forest types: First, according to the classification of forest vegetation, it is a method of delineating forest type according to biogeographical community (Sukhachov). Most of the secondary forests in our country have been re-formed after their destruction in history. Therefore, the forest vegetation