东北林区不同尺度森林的含碳率

准确估算森林生态系统碳储量对整个陆地生态系统碳循环及全球变化研究具有至关重要的作用.本研究利用2007、2008年东北林区(大兴安岭林区、小兴安岭林区、张广才岭和长白山林区)标准地调查数据及同一时期的一类样地清查数据,采用地面乔、灌、草生物量模型及实验室Multi N/C 3000分析仪测定的林木含碳率，计算不同尺度上森林生物量及碳储量,分析不同尺度森林含碳率的变化及稳定性.结果表明: 东北林区林木不同器官的含碳率差异明显,其平均含碳率为树叶(0.4448)＞树枝(0.4422)＞树皮(0.4398)＞树干(0.4351).张广才岭和长白山林区针叶林的含碳率高于阔叶林,而大、小兴安岭林区阔叶林的含碳率高于针叶林.研究区域森林的含碳率相对稳定,东北林区森林总含碳率为0.44.

Forest carbon rates at different scales in Northeast China forest area

To accurately estimate forest carbon storage is of significance in researching terrestrial ecosystem carbon cycle and global change. Based on the survey data from the representative plots in Northeast China forest area (Da Xing' an Mountains, Xiao Xing' an Mountains, Zhangguangcai Mountains and Changbai Mountains) in 2007 and 2008 and the inventory data in the same period, and by using the models for estimating ground tree biomass, shrub biomass, and grass biomass and the Multi N/C 3000 for measuring forest carbon rate in laboratory, this paper calculated the forest biomass and carbon storage in the forest area, and analyzed the variation and stability of the forest carbon rates at different scales. There was an obvious difference in the carbon rates among tree organs, being the highest in leaf (0.4448), followed by in branch (0.4422), bark (0.4398), and trunk (0.4351). In Changbai and Zhangguangcai Mountains, coniferous forest had a higher carbon rate than broad-leaved forest; whereas in Daxing' an and Xiaoxing' an mountains, it was in adverse. In Northeast China forest area, the forest carbon rates were relatively stable, with a total value of 0.44.