Figure 2

The inter-annual variations of carbon sink (e) and its forming fluxes, including gross primary productivity (GPP, a), human returned carbon (HC, b), ecosystem respiration (ER, c), and carbon removal from cropland (CRC, d), emission from reactive carbon (ERC), and emisssion from water erosion (Ewat), in Liaoning province of China during 2000–2014. ERC and Ewat were not shown as they were deemed to have no inter-annual variations in this study.