人工林红松木材碳素储存量与物理特征的径向变异

Radial Variation of the Wood Carbon Storage and Physical Characteristics of the Planted Pinus koraiensis

【目的】对人工林红松木材碳素储存量与物理特征的径向变异进行研究,以弥补我国木材碳素储存研究的不足,为提高木材碳素储存量、高效合理地定向培育人工林红松提供理论基础。【方法】首先测定和计算红松木材的各项物理特征及其碳素储存量,再采用回归分析和相关分析方法对木材碳素储存量分别与生长轮密度、生长轮宽度、晚材率和生长速率的径向变异规律进行分析,最后得到它们之间的径向变异规律图、拟合图以及回归方程等。【结果】木材碳素储存量在径向变异上先略微减小,接着随树木的不断生长呈增大趋势,而在树木成熟后又逐渐减小至平稳状态,且波动较大,并与各项物理特征的径向变异趋势在第18年左右有一个峰值。木材碳素储存量与生长轮密度的径向变异趋势相似,二者的拟合度较高,相关系数为0.757,相关性较显著;木材碳素储存量与生长轮宽度在前期的径向变化相似,而中期和后期的径向变异不一致,二者的拟合度较低,相关系数为-0.301,相关性较弱;木材碳素储存量与晚材率在中期和后期的径向变化相似,二者的拟合度较高,相关系数为0.656,相关性较显著;木材碳素储存量与生长速率在前期和中期的径向变异趋势都不同,二者的拟合度较低,相关系数为-0.268,相关性不显著。【结论】人工林红松木材的碳素储存量与各项物理特征指标之间均有一定的相关关系,而气候因子、生长环境、遗传因素等是不可忽略的影响因素,有待进一步研究。可以通过对林木的合理经营和发展,增强人工林的碳素储存功能,直接抑制CO2向大气中排放,从而改善生态环境、缓解温室效应。

【Objective】Global warming was mainly caused by the increasing amount of greenhouse gases（ especially Carbon dioxide,CO2）,which were made by human activities. Wood is the main body of trees. The carbon content of wood is 50%. Thus,wood is a huge carbon repository. 【Method】Pinus koraiensis plantations from the northeast of China were selected as raw materials. The carbon storage function of Pinus koraiensis was studied. First, the physical characteristics and carbon storage of wood were measured and calculated. Then,the radial variation regularity of the wood carbon storage and the growth ring density, growth ring width, latewood ratio, and growth rate, was analyzed systematically using regression analysis and correlation analysis methods, Finally, we obtained the radial variation regularity figure,fitting figure,regression equation,and so on.【Result】The results showed that： the carbon storage of wood firstly decreased slightly on the radial variation. Then,the carbon storage of wood increased with the growing of trees. Next,it decreased to a steady state after the trees became mature. The carbon storage of wood and the radial variation trend of the physical characteristics had a peak at around 18 years. The radial variation trend between the wood carbon storage and the growth ring density was relatively similar. The fitting degree was high. The correlation was apparentwith correlation coefficient of 0. 757. The early radial change between the carbon storage of wood and the width of growth ring was similar. But the middle and late radial variation was inconsistent. The fitting degree was low. The correlation was weak with correlation coefficient of- 0. 301. The middle and late radial change between the carbon storage of wood and the latewood rate was similar. The fitting degree was high. The correlation was apparent with correlation coefficient of0. 656. The early and middle radial variation trend between the carbon storage of wood and the growth rate was different.The fitting degree was low. The correlation was not apparent with correlation coefficient of- 0. 68. 【Conclusion】The carbon storage of Pinus koraiensis had a certain relationship with the physical characteristics. The climate factors,growth environment and genetic factors were the important factors which can not be ignored. They remained to be further researched. To improve the ecological environment and alleviate the greenhouse effect,we should operation and utilization of trees reasonably to strengthen the carbon storage function of man-planted forest and restrain the carbon dioxide emissions into the atmosphere directly.