人工林胡杨树高、基径、冠径与胸径的关系分析

为了给人工胡杨林的造林设计、经营规划、抚育间伐强度的确定提供参考依据，以塔里木河上游河岸胡杨人工林为研究对象，研究了胡杨树高、基径、冠径与胡杨胸径的关系。结果表明，胡杨树高与胸径的回归方程，即树高曲线方程为：H=12.8737/1 + e^{(1.4228- 0.1781D)}]；胡杨基径与胸径的回归方程：D₀=1.2839D_1.3+0.1465，胸径与基径的回归方程：D_1.3=0.7516D₀+0.4071；胡杨冠径与胸径的回归方程：CW= 0.1897D_1.3+0.6911，将人工胡杨林林分平均胸径带入方程，求出各径阶平均冠幅直径估计值，按圆面积公式计算营养面积，用单位面积去除营养面积，即胡杨人工林理论密度。

Analysis of Relationship Among Tree Height, Basal Diameter, Crown Diameter and Breast Diameter in the Populus euphratica Plantation

In order to provide basis for afforestation designs, business programming and determination of tending thinning intensity in the artificial forests of Populus euphratica, the Populus euphratica plantation in the upper riparian reaches of Tarim River was taken as the research object to study the relationship among tree height, basal diameter, crown diameter and breast diameter. The result showed that: regression equation of tree height and breast diameter in Populus euphratica, which was H=12.8737/1+e(1.4228-0.1781D)], the regression equation of basal diameter and breast diameter in Populus euphratica was D0=1.2839D1.3+0.1465, the regression equation of breast diameter and basal diameter was D1.3=0.7516D0+0.4071; meanwhile, the regression equation of crown diameter and breast diameter in Populus euphratica was CW=0.1897D1.3+0.6911. The stand mean diameter of the Populus euphratica plantation was placed by equation, and obtained by estimate the diameter of each diameter average crown. According to the formula of circle calculated nutritive area, the unit area to remove nutritive area, which was theoretical density of the Populus euphratica plantation.