An estimation of soil organic carbon (SOC) pool and understanding of the sequestration dynamics is being one of the research foci for a country or a region to setup the total emission budget. By synthesizing and analyzing statistically the SOC data at different spatial level and temporal durations all over China, the SOC storage and distribution over geographical regions and soil types was presented, the recent C sequestration in agricultural soils was demonstrated, and uncertainty of C sequestration mechan...