在炎陵县青石岗林场,采用样地调查的方法测量木荷次生天然林树高、胸径;应用Excel软件绘制胸径与树高关系的散点图,选取比较适合散点分布趋势的线性方程、二次曲线、幂函数、对数函数4种生长模型,结合SPSS、Matlab软件对木荷胸径与树高的关系进行拟合。结果表明:在95%的置信区间内,对数函数的回归效果最显著,相关系数最大为0.992,残差平方和最小为18.689,正确率达97.5%;在不考虑单个方程对整体的拟合效果时,用幂函数、对数函数、二次曲线函数3个模型的分段函数,更能准确地描述木荷的胸径树高生长特性,为最佳生长模拟模型。
In the county of Yanling Qingshigang Forest Farm ,adopt the method of sample plot survey to measure of the Schima super-ba of secondary natural forest tree height ,DBH.Applied of Excellsoftware to draw a scatter plot of the relationship between the diam -eter at breast height and tree height .Selected linear equations ,quadratic curve ,power function and logarithmic function such 4 kinds of growth models.With SPSS,and Matlab softwares,it fitted the Schima superba DBH and tree height relations.The results showed that:One was within the 95% confidence interval,the most significant regression effect was the logarithmic function ,the maximum correlation coefficient was 0.992 and the minimum residual sum of squares was 18.689 , the correct rate reached 97.5%.Another one was when no considering the effect of a single equation fitting ,power function,logarithmic function and quadratic curve 3 mod-els,it could more accurately describe the DBH ,and tree height growth characteristics of Schima s