中国草地碳收支研究与展望

STUDY ON CARBON BUDGET IN GRASSLAND OF CHINA:PROGRESS AND PERSPECTIVES

如何提高生物圈固定大气CO_2的能力是减缓气候变化的重要主题。中国草地面积约400×10~6hm^2,占世界草地面积的12.5%,在吸收和固定大气CO_2中具有重要作用。文章就气候变化和人类活动对草地碳收支的影响以及区域和国家尺度草地碳收支变化的研究进展进行了评述,提出未来中国草地碳收支研究应重点关注3个方面:气候变化和人为干预对草地碳收支影响的驱动机制;中国草地碳收支变化的时空特征与固碳潜力;草地生态系统碳收支模型的开发。

Sequestration of atmospheric CO2 in the biosphere is expected to mitigate climate change. There are ca. 400 million hectares of grassland in China, accounting for ca. 12.5% of the world total grassland, which may make great contribution to the assimilation and sequestration of atmospheric CO2. By reviewing research progress in the impacts of climate change and human activities on grassland carbon budget, and the model estimates of changes in grassland carbon budget at a regional and national scale,we suggest that future studies on carbon budget in grassland of China should focus on the mechanisms of climate change and human activities impacts on grassland carbon budget, temporal and spatial characteristics of changes in carbon budget, carbon sequestration potential, and the development of carbon budget models for grassland ecosystems.