浙江省湖州市丘陵地区封山育林7年,按原造林地类型不同,可划分为露岩、荒山和疏林封山类型。作者把封山育林7年的林分与封山育林20年的林分加以对照,论述了各封山类型林分的树种组成、群落结构特征、演替规律和生物产量。实践证明:封山育林是一种成本低、效果好、能迅速恢复森林植被的行之有效的营林手段。 In the hilly area of ​​Huzhou City, Zhejiang Province, seven years of closing hillsides for afforestation have been established. According to the different types of original afforestation land, they can be divided into the types of exposed rocks, barren hills and sparse forests. The author compared the stand of closing hillsides to afforestation for seven years with that of closing hillside for afforestation for 20 years, and discussed the tree species composition, community structure, succession law and biological yield of each type of closed mountain. Practice has proved that closing hillsides for afforestation is an effective means of forest management with low cost, good effect and rapid restoration of forest vegetation.