Carbon Sequestration in China Over the Past Century
Mao, J., Wang, B. and Yongjiu, D. 2009. Sensitivity of the carbon storage of potential vegetation to historical climate variability and CO2 in continental China. Advances in Atmospheric Sciences 26: 87-100.
Mao et al. report that their modeling exercise suggested that "during the past 100 years a combination of increasing CO2 with historical temperature and precipitation variability in continental China have caused the total vegetation carbon storage to increase by 2.04 Pg C, with 2.07 Pg C gained in the vegetation biomass but 0.03 Pg C lost from the organic soil carbon matter." They also found that "the increasing CO2 concentration in the 20th century is primarily responsible for the increase of the total potential vegetation carbon." However, because the biological effects of temperature and precipitation were negative, the historical increase in the air's CO2 content was actually totally responsible for the net storage of carbon in China's terrestrial vegetation and soil over the 20th century, since without the aerial fertilization effect of CO2, there would have been a net loss of carbon that exceeded in absolute value the net gain that ultimately prevailed.
Woodward, F.I. and Lomas, M.R. 2004. Vegetation dynamics -- Simulation responses to climatic change. Biological Reviews 79: 643-670.