基于树冠因子的林木竞争指数研究

[目的]以湖南省黄丰桥国有林场杉木纯林为研究对象,进行树木竞争指数的研究,基于Hegyi简单竞争指数的形式,提出包含反映树冠特征因子的树冠竞争指数。[方法]将树冠竞争指数和Hegyi简单竞争指数分别与胸径增长量进行相关分析。[结果]Kendall's tau-b系数、Spearman's rho系数和相关系数R²均显示树冠竞争指数与林木生长量的相关性高于Hegyi简单竞争指数。[结论]该结果表明树冠竞争指数与林木生长量有更强的相关性,可以更好地体现树冠在树木生长中的作用,能作为模拟林分生长量的依据。

Study of Tree Competition Index Based on Crown Feature

The crown competition of Cunninghamia lanceolata pure stands of Huangfengqiao National Forest Farm in Hu'nan Province was studied and the crown competition index was established. The crown competition index was based on Hegyi competition index and its factors were related to crown. From correlation analysis of DBH (diameter at breast height) increment and two competition indexes, the Kendall's tau-b correlation coefficient, Spearman's rho correlation coefficients and R² was got, which showed that the crown competition index was more relevant to DBH increment than Hegyi competition index. The results also showed that the crown competition index and tree growth had a more substantial correlation. Moreover, the crown competition index could preferably indicate crown's influence on tree growth. Consequently, the crown competition index can be used as the basis of stand growth simulation.