中国落叶松林胸径–树高相关关系的探讨

基于幂函数H=a D~b,对我国广泛分布的8种落叶松属(Larix Mill.)乔木184个样方胸径(D)与树高(H)的相关生长关系进行分析,并探讨林分密度、林分总胸高断面积、年均温度和年降水量对相关生长系数(b值)的影响。结果表明,相关生长系数在不同落叶松属间存在显著差异(P0.05):东北地区的兴安落叶松林(0.65±0.11)和黄花落叶松林(0.68±0.10)的相关生长系数显著高于西南地区的四川红杉林(0.51±0.17)和红杉林(0.54±0.15)(F=2.34,P=0.026)。林分密度和总胸高断面积不能解释b值的空间变异(P0.05),但年均温与b值显著负相关(R~2=0.09,P0.001)。研究结果说明落叶松属的不同种之间胸径–树高关系不同,且温度可能是导致不同落叶松林分胸径–树高关系存在差异的主要原因。

Allometric Relationship between Tree Height and Diameter of Larch Forests in China

184 plots from larch (Larix Mill.) forests across China were sampled to characterize the height-diameter relationships and investigate the effects of structure and climate on them based on the power functionH =aDb. The results showed that the height-diameter relationship differed greatly among species:b-value ofLarix gmelinii(0.65±0.11) andL. olgensis(0.68±0.10) were significantly higher thanL. mastersiana(0.51±0.17) andL. potaninii(0.54±0.15) (F=2.34,P=0.026). These differences were significantly influenced by mean annual temperature, but no statistic relationships were detected between stem density, total basal area and mean annual prepetition againstb-value. These results indicated that as mean annual temperature increased, a higher proportion of biomass was allocated into diameter growth than height growth (R2=0.09,P<0.001).