Research On Stand Structure And Growth Of Adiessibirica Ledeb

Adiessibirica Ledeb is an evergreen tree which belongs to Pinaceae, and it is also the main coniferous species in the forest area of Changbai Mountain. Grown in the region of southern slope of Lesser Khingan Mountains、Changbai Mountain area and 300 to 1800-meters-high area of Zhangguangcailing in Northeastern China,Adiessibirica Ledeb plays an important role in water conservation and timber utilization in Northeastern China.As most of the limited research are related to the chemical composition or medicinal value of it,scientific basis for rational management and high efficient utilization of secondary Adiessibirica Ledeb forest are expecting to be put forward through this study.This article comes from the project of "research on key techniques of tending management in the area of natural non-commercial forest protection project(The Item Number:201204504)" which is national forestry public welfare projects.Focused on the secondary Adiessibirica Ledeb forest in Wangqing district of Jilin province,we use the plot and the data of the parse tree to figure out the basic structure and the characteristics of Adiessibirica Ledeb forest stand and also analyze its growth process of each factor of tree measuring.Meanwhile, a growth model of the single wood and the basal area of Adiessibirica Ledeb forest stand has been built based on the data of the parse tree.The main research and results are as follows:(1)The research on basic structure of Adiessibirica Ledeb forest stand includes the composition of tree species,age structure,law of stand diameter structure and height structure. The important value of each wood in plot were calculated based on the data of the plot,in order to figure out the composition of tree species.We use the histogram to count and analyze the age distribution of secondary Adiessibirica Ledeb forest,and also use multiple equation and function to match and take a Chi-square test on the results,it shows that the model accords with the growth law of Adiessibirica Ledeb.(2)The growth process of Adiessibirica Ledeb,including the tree height,diameter and volume, was analyzed by using the data of the plot and the parse tree. We mainly analyzed the annual increment,annal growth increment and the maximum age of each factors.The results shows that the current annual increment of each factors grow fast in the early year,while the annual growth increment grow relatively slow. The maximum current annual increment of diameter and height show up at lOOa.the annual increment and the annal growth increment of value become the same level at 100a,reaching the number maturity.(3)Research in growth model of single wood and standing forest of Adiessibirica Ledeb.Five different theoretical equation were used to describe the growth process of diameter,tree height and volume,and the most accurate and adaptable equation was chosen as the growth model.Besides,we chose the age and stand density index as argument,based on the equation of Korf s theory,to build the growth model of Adiessibirica Ledeb standing forest,which is high-accurate,well-adaptive and utility in practical application, in accordance with the law of growth Adiessibirica Ledeb standing forest.