论文部分内容阅读
树高曲线是开展森林资源调查、森林结构调整、林木生长研究等方面的基础。以小陇山日本落叶松(Larix leptolepis)人工纯林为研究对象,采用标准地调查方法,对日本落叶松胸径、树高关系进行分析;运用SPASS17.0进行模型估计,选择一元线性方程,指数方程,对数方程,二次多项式和幂函数对树高曲线进行拟合,初步筛选出拟合精度较好的一元线性方程和二次项方程,用ForStat2.2做方程适应性分析和残差分析,用残差平方和、总相对误差、平均相对误差、平均相对误差绝对值指标进行验证,最终确定了小陇山林区日本落叶松最适树高曲线为H=4.242+0.639D+0.004D2。
Tree height curve is to carry out forest resources survey, forest structure adjustment, tree growth research and other aspects of the foundation. Taking the Larix leptolepis artificial pure forest in Xiaolongshan as the research object, the relationship between the diameter and the tree height of Larix leptolepis was analyzed by standard survey method. The model was estimated by using SPASS17.0, the linear equation was selected and the index Equation, logarithmic equation, quadratic polynomial and power function were used to fit the curve of the tree height. The first-order linear equation and the quadratic equation with good fitting accuracy were screened out initially. The adaptability analysis and residual Finally, the optimal tree height curve of Larix kaempferi in Xiaolongshan forest area was H = 4.242 + 0.639D + 0.004D2 .