Fig. 8 Average SOC contents for the different soil types (a) and
the amounts of chemical fertilizers use over the past three decades in
southern Jiangsu Province (b).
In Fig. 8a, the bold values represent the average SOC contents, and the
error bars represent the standard deviation of the SOC contents. In Fig.
8b, data was sourced from the Jiangsu Bureau of Statistics,http://tj.jiangsu.gov.cn.
Fig. 9 Crop-derived carbon inputs over the period of 1980-2015
in southern Jiangsu Province (a), in county-level cities (b ),