Fig. 3From: Variations of forest soil organic carbon and its influencing factors in east ChinaForest soil site data for organic horizons (A horizon) SOC density (kg C m−2) (a) and the soil profiles’ SOC density (kg C m−2) (b), in relation to longitude and latitude for the site. Site data are shown in relation to their distribution among north-eastern China (black), middle-eastern China (orange), and south-eastern China (red)Back to article page