阔叶林林分结构特征 I.林分年龄与林分密度的关系

The structure characters of broad-leaved woodland I.The relationship between stand age and stand density

从林分密度与年龄结构的关系方面应用列联表对阔叶林林分结构变化规律进行研究。通过对福建省750个阔叶林固定样地进行调查,并对收集的资料进行卡方检验、残差分析及log-线性模型的拟合。结果表明:卡方检验中密度与年龄的连带关系明显;残差分析中密度与年龄关系与实际规律的一致性不明显并且主效应估计分析结果与交互作用效应估计之间略有差异,这可能是天然阔叶林受自身因素影响较多而受人为因素影响较少的缘故。

The structure of broad-leaved woodland has been studied from the relationship between stand mean age and stand density by two-way contingency table. The data investigated from 750 fixed plots located in Fujian Province were analyzed. After analysis by x^2 examination, the residual analysis and the log-linear simulating, the major results are as followings： the relationship of stand density and stand mean age is obvious by x^2 examination, but the relationship does not obviously conform to the actual results in the residual analysis. Moreover, the estimations of major effect are not consistent with the interaction effect slightly, which is because the bread-leaved woodland is influenced by own factors more than human factors.