末次间冰期以来陆地生态系统的碳储量与气候变化

陆地生态系统的碳收支是全球气候变化和碳循环研究的核心内容之一.准确估算陆地生态系统的碳储量及其收支状况,对正确评价陆地生态系统在全球碳循环中的作用有重要意义.本文总结了近10年来各国研究者利用不同方法对陆地碳储量变化的研究进展,并对估算陆地碳储量的不确定性进行评价.同时,对陆地生态系统碳储量变化研究结果的分析表明,末次间冰期以来,全球陆地生态系统碳储量存在较大幅度的变化.在末次间冰期5e阶段、末次盛冰期和全新世中期,陆地生态系统碳储量分别为现在的l30～150%、50～85%和105～130%.并且,陆地生态系统碳储量与气候变化有显著的正相关性,但不同区域的生态系统碳储量随气候变化并非具有相同的变化规律.

CHANGES IN TERRESTRIAL CARBON STORAGE WITH GLOBAL CLIMATE CHANGES SINCE THE LAST INTERGLACIAL

Changes in terrestrial carbon storage is a key issue for understanding the global carbon cycle and history of the climate system. Improving our understanding of the changes in terrestrial carbon storage at various spatial and temporal scales is critical for appropriate evaluation of its role in the global carbon cycle. After a brief review of the progress in the methods of reconstructing terrestrial carbon storage since the last interglacial,we also evaluated the uncertainties in reconstructed terrestrial vegetation and carbon storage by different methods. The main results obtained at both global and regional scales suggest that carbon storage in terrestrial vegetation was relatively low when it was colder, drier and lower atmospheric CO2 climatic condition particularly during the last glacial time, whereas the carbon storage increased considerably at times when it was warmer, wetter and high atmospheric CO2 during the last interglacial and mid-Holocene. Most of the recent estimates the converge to 130-150%, 50-85% and 105-130% carbon storage at the last interglacial, the last glacial and mid- Holocene respect to present. However, the changes in terrestrial carbon storage with climate were not same role in different region. Further progress in understanding the dynamic processes of global carbon cycle will require both the development of global palaeoecological database and the development of biosphere models.