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:

为掌握防城季节性雨林优势种的形态特征及相关生长规律，基于1 hm2群落样地实测数据，对罗浮柿测树因子进行曲线回归和通径分析。结果表明：罗浮柿株高、胸径和冠幅之间存在着极显著的相关关系；胸径-株高、胸径-冠幅、株高-冠幅的最优回归方程都属于幂曲线模型，表达式分别为H=3.0248×D0.4501（R2=0.634）、W=0.6600×D0.5462（R2=0.613）和W=0.3147×H0.9108（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胸径对冠幅的影响，胸径对于冠幅的影响大于株高对冠幅的影响。

Abstract:

In order to understand the morphological characteristics and related growth rules of the dominant species in Fangcheng seasonal rain forest，the tree factors of Diospyros morrisiana were analyzed by curve regression and path analysis，based on the measured data of 1 hm2 community plot.The results showed that there is a highly significant correlation between tree height (H), diameter at breast height (D), and crown diameter (W) of Diospyros morrisiana. The optimal regression equations of D and H, D and W, and H and W all belong to the power curve models, expressed as H=3.0248×D0.4501（R2=0.634）、W=0.6600×D0.5462（R2=0.613）和W=0.3147×H0.9108（R2=0.545）respectively. Diameter at breast height and tree height have significant positive effect on crown diameter.The influence of diameter at breast height on tree height is greater than that of diameter at breast height on crown diameter, and the influence of diameter at breast height on crown diameter is greater than that of tree height on crown diameter.