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 ),