4IPCC. Climate Change: Mitigation of climate change. Work- ing group III Contribution to the fourth assessment report of the IPCC[M]. Cambridge, UK: Cambridge University Press,2007,195-199.
5l.ai R. SoiI carbon sequestration impacts on global cli- mate change and food security[J]. Science, 2004,304: 1623-1627.
6Lal R. World soils and the greenhouse effect[J]. Global Change News Letter,1999,37:4-5.
7Watson R T,Noble I R. Carbon and the science-policy nexus:the Kyoto chalIenge[C]. In: Steffen W, Jager J,Carson D, et al. Challenges of a Changing Earth. Proceedings of the Global Change Open Science Con ference[C]. Berlin : Springer, 2001:57-64.
