Neutral crop carbon sink: We supposed that the crop biomass carbon sink was neutral, because most of it would return to atmosphere through decomposition and combustion in a short time. So, the data estimated in this study have not been used for the accounting of China’s carbon sinks.
Acknowledgement The studies have been supported by NSFC (39425003, 40024101, 39830050, 39970044, 49971002, and 30000024), China Ministry of Education (# 99001), China Ministry of Science & Technology (G2000046801, 85-913-01-02), and Peking University.
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