2Brown S, Gillespie A J R, Lugo A E. 1989. Biomass estimation methods for tropical forests with application to forest inventory data. Forest Science, 35 : 881 - 902.
3Ciais P, Tans P, Trolier M, et al. 1995. A large northern hemisphere terrestrial CO2 sink indicated by the 13C/12C ratio of atmospheric CO2. Science, 296:1098 - 1101.
4Dixon R K, Brown S, Houghton R A, et al. 1994. Carbon pools and flux of global forest ecosystems. Science,262:185- 190.
5Falkowski P, Scholes R J, Boyle E, et al. 2000. The global carbon cycle: a test of our knowledge of earth as a system. Science, 290(13) :291 -296.
6Goulden M I,Wofsy S C,Harden J W, et al. 1998. Sensitivity of boreal forest carbon balance to soil thaw.Science, 279:214- 217.
7Hansen J, Ruedy R, MkiSato, et al. 1996. Global surface air temperature in 1995:Return to pre-pinatubo level. Geophysical Research Letter, 23:1665 - 1668.
8Houghton J T, Ding Y, Griggs D J, et al. 2001. Climate Change 2001. The scientific basis. Contribution of working group Ⅰ to the third assessment report of the intergevemmental panel on climate change. Cambridge: Cambridge University Press.
9Tans P P, Fung I Y,Takahaski N P, et al. 1990. Observational constraints on the global atmospheric CO2 budget. Science, 247:1431 - 1438.
