塔里木大学学报

本文以塔里木河上游人工胡杨林为研究对象,对处于异形叶变化发育阶段的355株标准木进行了径阶整化,然后通过对各径阶平均胸径和树龄进行方程拟合得到了树龄与胸径的关系。结果表明:Logistic方程、抛物线方程和幂函数方程均能较好地反映树龄与胸径的关系,三种方程中平均胸径与树龄均呈现显著正相关关系,且相关系数均达到了0.96以上,其中Logistic方程相关系数最大达到0.996 3,残差均方最小为0.032 3是最适合的方程。

This paper the artificial forest ofPopulus euphratica Oliv was took as the research object in the upper reaches of Tarim river,the relationship between the age of tree and the diameter at breast height amongst 355 sample trees,which were in the stage of heterophyll changing was studied,the diameter rounding equation was fitted with the average of diameter at breast height and age of tree each of each diameter class.The results showed that the logistic equation,parabolic equation and power function equations could be well fitted the relationship between age of tree and the diameter at breast height at significant positive level(0.1%) in the three equations,and the correlation coefficient reached 0.96 or above,the highest correlation coefficient was 0.996 3 at Logistic equation with the minimum residual mean square 0.032 3,and it suggested that Logistic equation was the most suitable equation.