用分位数回归建立的混交林树高生长模型

依据黑龙江省大兴安岭地区落叶松白桦混交林的树高、胸径、活枝高以及树冠的东、南、西、北冠幅数据,利用最小二乘法建立了两树种树高与胸径、树高与活枝高之间的数学模型,并利用线性分位数回归方法建立了不同分位点(τ=0.10、0.25、0.50、0.75、0.90)两树种树高与胸径、树高与活枝高之间的数学模型,分析τ∈(0,1)间距相同的19个分位数点的两树种树高与胸径、树高与活枝高之间的数学模型,得出不同分位数点处胸径、活枝高与树高之间的关系,比较了对照组与间伐组数据所建立模型的差异。

Tree Height Growth Model of Mixed Forest Using Quantile Regression

With the data of H,DBH,LBH and the east,south,west and north of the canopy in the Daxing’an Mountains of Heilongjiang Province,we established a mathematical model between the tree height(H)and the diameter at breast heigh(DBH),the H and the live high branch(LBH)using the least squares method,and used linear quantile regression method in different quartile points(τ=0.10,0.25,0.50,0.75,and 0.90)between H and DBH,and H and LBH of the two tree species,analyzied the mathematical model using H and DBH,and H and the LBH of two tree species at 19 quartile points with the same spacing inτ∈(0,1),obtained the effect of the DBH and the LBH on the H,and compared the differences between the models in the control groups and thinning groups.