中国区域土地利用/覆被变化对陆地碳收支的影响

准确估计土地利用/覆被变化（LUCC）对陆地生态系统碳收支的影响已成为当前全球变化和全球碳循环研究的重点内容。本文通过文献调研和数据的整合分析方法总结讨论了近年来中国区域LUCC时空特征及其对陆地碳收支影响,为合理评价中国区域陆地碳平衡以及确定未来研究发展方向提供参考。已有大量研究对近年来中国区域LUCC主要特征进行了探讨,并分别利用卫星遥感方法和IPCC清单法对中国区域陆地碳源汇影响进行了评估。结果表明,目前全国土地利用活动,特别是农林活动正对陆地生态系统碳收支产生了比较显著的积极作用,但基于以上两种方法的研究结论之间差异很大,反映出中国LUCC导致陆地碳收支变化的评估结果仍存在着较大的不确定性。通过分析认为,中国未来的研究工作应着重于发展和利用基于土地利用相互转化面积的计量方法,以提高对中国区域LUCC导致陆地碳收支变化评估的准确性。

Effects of Land Use and Cover Change on Terrestrial Carbon Balance of China

Accurate estimation on the effects of land use and cover change(LUCC) on terrestrial carbon balance has become one of the focuses in the research on the global carbon cycle.This paper attempts to review the studies on LUCC in recent years and its effects on terrestrial carbon balance in China,to provide references for the assessment of China’s terrestrial carbon balance and the choice of future research topics.The extensive information has been obtained from researches on China’s LUCC in recent years,and the corresponding carbon source and sink effects have been assessed by using the inventory method presented by IPCC and the satellite-based method respectively.Results indicate that land use activities,especially those related to agriculture and forest management,are affecting terrestrial carbon balance positively.However,the satellite-and inventory-based estimates indicated significant uncertainty in the estimates.Future researches should focus on the development and application of estimation methods based on the information of land-use conversion areas,to improve the assessment on effects of LUCC on China’s terrestrial carbon balance.