防城季节性雨林优势种罗浮柿测树因子曲线回归与通径分析

Curve Regression and Path Analysis of Tree Measurement Factors of Dominant Species Diospyros morrisiana in Fangcheng Seasonal Rainforest

为探究防城季节性雨林优势种罗浮柿(Diospyros morrisiana)的形态特征及其相关生长规律,本研究基于防城那山子季节性雨林1 hm2群落样地实测数据,对其测树因子进行曲线回归和通径分析。结果表明:罗浮柿株高(H)、胸径(D)和冠幅(W)之间存在极显著的相关关系;胸径-株高、胸径-冠幅、株高-冠幅的最优回归方程均为幂曲线模型,表达式分别为H=3.0248×D^(0.4501)(R^(2)=0.634)、W=0.6600×D^(0.5462)(R^(2)=0.613)和W=0.3147×H^(0.9108)(R^(2)=0.545);胸径和株高对冠幅具有极显著正向作用,胸径对株高的影响大于其对冠幅的影响,其对冠幅的影响大于株高对冠幅的影响。因此,罗浮柿的株高和冠幅可通过测定其胸径来估算。

In order to explore the morphological characteristics and related growth rules of the dominant species Diospyros morrisiana in the seasonal rainforest of Fangcheng,this study was based on the measured data of 1 hm^(2) community sampling plots in the seasonal rainforest of Nashanzi,Fangcheng,and the tree measurement factors were analyzed by curve regression and path analysis.The results showed that there was a extremely significant correlation between plant height(H),diameter at breast height(D)and crown width(W)of D.morrisiana.The optimal regression equations of D and H,D and W,and H and W were all power curve models,and the expressions were H=3.0248×D^(0.4501)(R^(2)=0.634)、W=0.6600×D^(0.5462)(R^(2)=0.613)and W=0.3147×H^(0.9108)(R^(2)=0.545)respectively.The effect of D on plant height was greater than that of D on crown width,and the effect of D on crown width was greater than that of plant height on crown width.Therefore,the plant height and crown width of D.morrisiana can be estimated by measuring its diameter at breast height.