粤东6种阔叶树木材密度及其影响因子研究

【目的】分析不同影响因子对木材密度的影响,为木材密度的良种选育和碳汇计量提供理论和数据支撑。【方法】在康禾自然保护区样地中,通过群落分析筛选出6个优势树种,测定其木材密度(包括生材密度和基本木材密度),通过多种统计软件分析不同树种、不同径阶和不同坡向对木材密度的影响,以及树木性状因子与木材密度的相关关系。【结果】木材密度在树种间的差异性极显著,生材密度、基本木材密度和含水率平均值最大的分别是米槠Castanopsis carlesii、红锥C.hystrix和米槠,其数值分别为1.10 g·cm~(-3)、0.53 g·cm~(-3)和122.84%。木材密度的径阶差异性分析结果显示,除了栲C.fargesii以外,其他树种的木材密度在径阶间变化并不显著。木材密度在坡向上的差异性分析结果表明,6个树种的木材密度在坡向间的差异均不显著。非参数相关分析结果表明,胸径、树高与生材密度的相关性强,而与基本木材密度的相关性弱。【结论】红锥含水率低,基本木材密度高,具备优质木材的条件。木材密度随着径阶的增加有上升的趋势,但在坡向上没有规律性变化。生材密度、基本木材密度与胸径、树高的关系并不一致,可能是因为生材密度受到含水率增加的影响。

Wood densities of six hardwood tree species in Eastern Guangdong and Influencing factors

Objective] This study aims to provide the theoretical and data supports for the breeding of wood density and carbon sink accounting by analyzing the effects of different impact factors on wood den-sity.Method]Six tree species were selected through the analysis of communities in sample plots of Kanghe nature reserve , and their wood densities were measured .This study analyzed the effects of differ-ent species , different diameter grades and different slope aspects on wood density , and the correlation be-tween tree traits and wood density using a variety of statistical softwares .Result] There were significant differences in wood density among different tree species .The highest averages of green densities ( 1.10 g? cm -3 ) , basic densities (0.53 g? cm-3 ) and the moisture contents (122.84%) were found in Cas-tanopsis carlesii, C.hystrix and C.carlesii respectively .There was no significant difference in wood den-sity among different diameter grades for all species except C.fargesii.There was no significant difference in wood density among different slope aspects for all species .The nonparametric Spearman ’ s rank corre-lation analysis showed that both diameter at breast height and tree height were significantly correlated with green density but not with basic density .Conclusion]C.hystrix produces high quality wood with low moisture content and high basic density .Wood density has a tendency to rise with the increase of diame-ter grade,but has no regular change with the change of slope aspect .The relationship between diameter at breast height , tree height and green density , and the relationship between diameter at breast height , tree height and basic density are different probably because green density is affected by the moisture content .