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

关键词:  罗浮柿  测树因子  曲线回归  通径分析  季节性雨林

Key words:  Diospyros morrisiana  tree measurement factor  curve regression  path analysis  seasonal rainforest

摘要:

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(R²=0.634)、W=0.6600×D^0.5462(R²=0.613)和W=0.3147×H^0.9108(R²=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。

Abstract:

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 hm² 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(R²=0.634)、W=0.6600×D^0.5462(R²=0.613) and W=0.3147×H^0.9108(R²=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.