国内外关于森林碳汇功能的研究集中于热带和温带森林，就中国东部亚热带森林，尤其是中亚热带常绿阔叶林的碳汇功能的研究较为薄弱。该研究选取井冈山国家级自然保护区作为中国中亚热带森林生态系统的典型代表，针对不同森林类型分别设置样地，采用材积源生物量法估算该地区森林生态系统植被碳储量，并以老龄林生态系统碳储量为参考标准，通过计算参考碳储量与基准碳储量之差，估算研究区森林植被的固碳潜力，旨在明确中国中亚热带森林生态系统在全球碳循环中的作用及贡献。研究发现，（1）井冈山自然保护区森林植被总碳储量为1589531 t，平均碳密度为7.29 kg·m-2，高于中国及全球中高纬度森林植被平均碳密度。常绿阔叶林植被碳密度最高，为9.25 kg·m-2，其次是针阔叶混交林和常绿落叶阔叶混交林，其植被碳密度分别为8.12和7.83 kg·m-2。（2）各林型老龄林的植被碳密度均高于平均植被碳密度，常绿阔叶林的老龄林植被碳密度最大，达10.53 kg·m-2。（3）研究区森林植被的固碳潜力为182868 t，常绿阔叶林的植被固碳潜力最大，达74086 t，其次为常绿落叶阔叶林混交林、暖性针叶林和针阔叶混交林。研究结果表明中国中亚热带森林生态系统具有较高的固碳能力。%Forest plays the key role in the global terrestrial carbon cycling. Therefore, the estimation of carbon storage capacity of forest ecosystem and its influencing factors at different scales is of great importance for the researches of global carbon balance and carbon budget. So far, related studies have mainly focused on forest carbon sink function analysis of tropical and temperate forests, but less research for the carbon sink function of subtropical forest, especially the subtropical evergreen broad-leaved forest in the eastern part of China. Taken Jinggang Mountain National Nature Reserve as the typical representative of subtropical forest ecosystem, the sample plots were set according to different forest types, the carbon storage of forest vegetation in the study area was estimated using the classic method of volume-derived biomass based on field sampling and investigation data, and the carbon sequestration potential was calculated as the discrepancy between the carbon stock of referred ecosystem (carbon storage of old-growth forest) and the carbon stock (carbon storage of forest ecosystem in 2012). This research can help to define the contribution of subtropical forest ecosystems in the global carbon cycle. The results showed: (1) the vegetation carbon storage of forest ecosystem was 1589531 t with the carbon density of 7.29 kg·m-2 which was higher than the mean value in China and other countries located at similar latitudes. The evergreen broad-leaved forest vegetation had the maximum carbon density of 9.25 kg·m-2, followed by mixed coniferous broad leaved forest and mixed evergreen and deciduous broad leaved forest, with the carbon density of 8.12 and 7.83 kg·m-2, respectively; (2) the vegetation carbon density of old-growth forest was higher than the average vegetation carbon density for all forest types. The old-growth evergreen broad-leaved forest had the maximum vegetation carbon density of 10.53 kg·m-2; (3) the carbon sequestration potential of forest vegetation was 182868 t. The evergreen broad-leaved forest vegetation had the maximum carbon sequestration potential of 74086 t, followed by mixed evergreen and deciduous broad leaved forest, warm temperate coniferous forests and mixed coniferous broad leaved forest. The results suggest that the forest system in the study area has great carbon storage capacity.
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