内蒙古自治区森林碳储量及其动态变化

Forest carbon storage and its dynamics in Inner Mongolia

利用内蒙古森林资源清查资料,依据不同森林类型生物量和蓄积量之间的回归方程,估算了内蒙古自治区不同时段的森林生物量和碳储量,并分析其动态变化特征。结果表明:在1977-2003年间内蒙古森林面积由1.10×107hm2增加到1.61×107hm2,每年森林面积平均增长率为1.85%;森林碳储量由378.86TgC增加到515.97TgC,每年平均增长率为1.45%,说明内蒙古森林起着巨大的储碳作用。内蒙古森林总碳储量中,落叶松林和桦树林碳储量的贡献率最大;森林碳储量中中龄林所占比重较大;不同森林类型及不同龄级的碳密度均呈增加趋势。内蒙古森林面积的增加碳储量也随之增加,对维护内蒙古生态环境起着重要作用。

Using the national forest inventory data surveyed by the State Forestry Administration of Inner Mongolia,forest carbon storage in Inner Mongolia was estimated with the regression equation between stand biomass and volume in different forest types.The results showed that in Inner Mongolia forest area increased from the 1.10×10^7hm^2 to 1.61×10^7hm^2 between 1977-2003.Aannual forest area growth rate increased by 1.85%;forest carbon stocks increased from 378.86TgC to 515.97TgC,the average annual growth rate was 1.45%.This indicated that forest ecosystem in Inner Mongolia played a role as a carbon sink in that period.Larix gmelinii and Betula have played a dominant role,and contributed much to the total forest carbon storage.The middle-aged forests accounted for a large proportion of total carbon,and the carbon density of different forest types and different ages showed a rising tendency.Therefore,Inner Mongolia forests would have a huge potential for carbon sink in the future if forests were fostered and managed well in major afforestation projects.