我国草地资源丰富,固碳量大,具有深厚的碳汇潜力.本文综合分析已发表的中国草地碳库相关研究结果,以期阐述中国草地碳库的情况及其分布格局,探究草地碳储量估算中不确定性因素导致的差异性.结果表明:中国草地碳储量估算结果差异较大,接近4倍;中国草地有机碳主要分布于高寒和温带地区;采用不同资料数据来源估算出的草地面积不同,利用草场普查资料估算的草地面积均值最大,卫星遥感数据估算出的最小;不同估算方法也导致碳库估算结果存在差异,全球平均碳密度法的草地碳储量平均估值最大,模型估算法最小;根冠比范围差距由0.38到52.30导致草地地下生物量碳储量估算差异较大.经综合分析,中国草地碳储量为41.67 PgC,具有较大的碳汇潜力.
As one of the most widespread vegetation types in the world, grassland ecosystem plays an important role in the global carbon cycle.China has very abundant resource of meadows and profound carbon sink.Grassland ecosystem holds a central position in the process of carbon cycling in terrestrial ecosystems in China, and even in global.The estimated carbon stock was different in the studies due to the differences in estimation methods and data resources.This study makes a synthetic analysis on carbon stock in grassland ecosystem of China by literatures.Our estimate indicated that the estimation of total carbon storage in grassland in China was very different.In China, the grassland carbon reserves are mainly distributed in alpine and temperate regions.The average area of grassland varied largely from different data resources, the maximum and minimum average areas came from the data of grassland inventory and remote sensing, respectively.Below-ground biomass estimates are also different due to different Root-shoot ratio data.The carbon storage was also different depending on estimation methods.The maximum and minimum value was estimated by average carbon density in global and models, respectively.Using a comprehensive analysis,the valuation of total carbon storage in the grassland of China was 41.67 PgC, which has great potential for carbon sequestration.