Fig. 7From: Total and dissolved soil organic and inorganic carbon and their relationships in typical loess cropland of Fengu BasinCorrelation between DOC and SOC content in the LFB, YCB and combined data (black dash lines) over (a) 0–20 cm and (b) 20–100 cm. One asterisk indicates significance at P < 0.05, and two asterisks at P < 0.01Back to article page