Characteristics of soil C:N ratio and δ¹³C in wheat-maize cropping system of the North China Plain and influences of the Yellow River.

However, mean soil EC and TDS present an increasing trend over depth, i.e, from 271 μs cm −1 in 0–20 cm to 445 μs cm −1 in 80–100 cm for EC, and from 681 to 1117 mg kg −1 for TDS.

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