and the relationship between annual SOC change and carbon inputs
among these county-level cities (c).
In Fig. 9c, annual SOC change represents the average SOC changes over
the past 35 years; carbon inputs represent the average carbon inputs
during 1980-2015; Carbon inputs were estimated using the crop yield data
recorded by county-level agricultural census (Zhao et al., 2018).
Fig. 10 Changes in the industrial and residential lands over the
period of 2000-2010 (a), the relationship between urban expansion and
the annual carbon inputs during 2000-2015 (b) .
UL represents the area of urban land, CL represents the cropland area;
land use data were obtained from Xu et al., (2018).