Research On Growth And Stand Structure Of Castanopsis Sclerophylla

Castanopsis sclerophylla is a typical Evergreen broad-leaved tree species in subtropical region of China,and is a excellent tree that have lots of advantages, such as landscaping, high quality wood, anti-virus, wind and fire. In view of the domestic study on Castanopsis sclerophylla is very little, and most of the study is confined to the cultivation, afforestation and other aspects, so the research in the growth model and the forest structure of the Castanopsis sclerophylla is become more and more important. Through this research, hoping to provide the scientific basis for Castanopsis sclerophylla's rational management and high efficient utilization.This article's content is a part of the public welfare industry of the state forestry administration research projects:"Southern collective secondary forest tending and thinning and efficient use of technology research"(The Item Number:201004032).Baesd on full analysis of the growth model and the forest structure of the Castanopsis sclerophylla,focused on the forest of Castanopsis sclerophylla in Guihua forest farm in Chongyang county of Hubei province, with the use of the plot and the data of the parse tree, build a growth model of the single wood and the basal area of the standing forest, and from stand infrastructure and spatial structure, in-depth study on forest structure characteristics and pattern. Main content and conclusions of the study are as follows:(1) The research in growth model of the single wood and standing forest about Castanopsis sclerophylla.Frist, use the five kinds of theoretical equation to describe diameter, tree height and volume growth, and select the equation which is the highest accuracy and the best adaptability as the growth model. Second, focused on analysis of each factors'current annual increment and annual growth increment and the age of the maximum of each increment. The current annual increment of each factor growing fast in early age, while the annual growth increment is slow, and they become same at48th year, reach the number of mature. At last, build the basal area's growth model, the argument is age and stand density index, and based on the theory of Richards equation. This model with higher accuracy and there is a certain degree of significance in practical application. (2) The study on the basic structure of Castanopsis sclerophylla. The diameter and height distribution of Castanopsis sclerophylla was studied using the application of Weibull distribution function, and select the higher accuracy equation as the simulated model, and the result showed that the model accords with the Hardleaf Oatchestnut using chi-square test.(3) The study in law of spatial structure of standing forest. Study from mixed, competition and the spatial distribution. The result shows that, mixed degree of the standing forest is lower, in the weak mixed state. Most of the Castanopsis sclerophylla forest grow in aggregation, the other varieties of trees are scattered in the standing forest; the competition is very fierce, and there is great pressure on Castanopsis sclerophylla and other varieties of trees; angle index of standing forest is greater than0.517, spatial structure of standing forest is mission-shaped distribute.