吉林蛟河针阔混交林主要树种树高-胸径模型

目的]建立吉林蛟河针阔混交林主要树种不同竞争强度个体的树高-胸径关系模型,并探讨竞争强度对树高-胸径关系的影响。方法]采用蛟河42 hm2成熟林固定样地中4个树种的树高-胸径数据,用Chapman-Richards、Logistic、Korf和Weibull模型这4种应用广泛的经验模型进行树高-胸径曲线拟合,选出适合的最佳模型。结果]表明:(1)4个树种的12组个体中有7个组的最佳模型形式是Weibull模型,4个组的最佳模型形式为Chapman-Richards模型,只有1组为Korf模型。(2)同一树种的低竞争强度个体和高竞争强度个体的最优模型形式不同。(3)用独立样本数据对最优模型进行检验,模型表现良好。结论]Weibull模型能够很好地拟合4个树种各竞争强度的树高-胸径关系,能够适用于本地区针阔混交林的树高-胸径模拟,并且竞争强度会影响树高-胸径关系,将各竞争强度个体分别进行树高-胸径拟合可以提高模型预测能力。

Height-Diameter Models of Main Tree Species in Broadleaf-Conifer Mixed Forest in Jiaohe, Jilin, China

Objective] The aim of this study is to establish the relationships between height and diameter at breast height (DBH) of main tree species under different competitive density in mixed broadleaf-conifer forests in Jiaohe of Jilin province. Method] Based on the data of four tree species sampled from a 42 hm² permanent mature forest plot, the relationships between height and DBH were simulated by four empirical models, Chapman-Richards, Logistic, Korf and Weibull model, to select the optimization model. Result] (1) Among 12 groups of samples, 7 groups were best modeled by Weibull model, 4 groups were best modeled by Chapman-Richards model, and only 1 group was best modeled by Korf model. (2) The optimization models simulated by individuals under low and high competitive density were different. (3) The optimization model worked well when examined by independent samples. Conclusion] The height-DBH relationships of 4 tree species under different competitive density can be well simulated by Weibull model, which is suitable for height-DBH relationships in mixed broadleaf-conifer forest. In addition, the relationships are affected by competitive density. The predictive ability will be improved by grouping individuals according to the competitive density.