中亚热带典型天然阔叶林主要树种林木高径比特征.

Fourteen main tree species from typical natural broad-leaved stands in the mid-subtropical zone of the Jian’ou Wanmulin Provincial Nature Reserve were studied to reveal the characteristics and provide a typical reference for the tree height diameter ratio of main broad-leaved tree species for the sustainable management of artificial, semi-natural, and natural broad-leaved forests in mid-subtropical zones. The mean tree height diameter ratio, standard deviation, variation coefficient, Mann-Whitney U test, Spearman rank correlation coefficient, exponential function, and hyperbola equation were used to analyze the characteristics of the tree height diameter ratio of the main tree species in each storey (including three strata and the whole stand). The results showed that the mean and maximum values of the tree height diameter ratio of the main tree species of typical natural broad-leaved stands in the mid-subtropical zone decreased with increasing stratum height. The mean values were significantly (P＜0.05) or extremely significantly different (P＜0.01) among each stratum. The correlation between tree height to diameter ratio and diameter at breast-height (DBH) of the main tree species in each storey showed an extremely significant negative correlation (P＜0.01). The correlation coefficients of strata Ⅰ and Ⅱ were significantly higher than those of the whole stand and stratum Ⅲ. The absolute values of the correlation coefficients were 0.806 1-0.895 3 for stratum Ⅰ, 0.788 2-0.964 3 for stratum Ⅱ, 0.419 0-0.809 1 for stratum Ⅲ, and 0.419 0-0.848 9 in the whole stand. The effects of the exponential and hyperbolic functions on the relationship between tree height diameter ratio and DBH of strata Ⅰ and Ⅱ of the main tree species were better than those of the whole stand and stratum Ⅲ. The R², Erms, and Ema of the main tree species in the whole stand and stratum Ⅲ were relatively high in the exponential function fitting, while those in strata Ⅰ and Ⅱ were relatively high in the hyperbolic fitting. The tree height to diameter ratio of the main tree species was not constant but varied with stratum and DBH. The characteristics of the tree height diameter ratio of each tree species can be expressed by the relationship curve between the tree height diameter ratio and the DBH of each stratum of the main tree species. [ABSTRACT FROM AUTHOR]