Study On The Structure Of Spruce-Fir Mixed Stands In The Over-logged Forest Of Changbai Mountains

How to manage the over-logged forest to keep its perfect forest structure and bring good benefit is one of the keys to keep the over-logged forest ecosystem succession ahead.This paper analysed the structure of Spruce-Fir mixed stands from the point of view of diameter structure, species composition and volume structure in Jin Gou Ling forestry farm of Changbai Mountains. The research indicated new ideas as following,①Weibull distribution and Logistic equation can be applied to describe the diameter structure of Spruce-Fir mixed stands;②the parameter q ranges from 1.201 to 1.551; ③the ratio of volume between conifer and broadleaf keeps stabilization except that one or two sections under the management; ④under the test of control method management in the past more than ten years, the volume proportion of the small and middling diameter tree is descending and the volume proportion of the long diameter tree is ascending; ⑤the test of control method management has adjusted and improved the diameter and forest volume structure of Spruce-Fir mixed stands,this kind of management also kept the over-logged forest ecosystem succession stabilization and ahead in the past more than ten years.