Table 2. Regressional relationships of SOC and STC determined between by the elemental analyzer and by the modified Walkley-Black (MWB) method in four soil depths on the Tibetan Plateau using a linear regression passing through the origin.

Soil depth (cm)		SOCCNS vs. SOCMWB			SOCCNS vs. STC
	n	Slope	R2	P	Slope	R2	P
0–5	179	1.054	0.967	<0.001	0.907	0.972	<0.001
5–10	180	1.158	0.976	<0.001	0.830	0.954	<0.001
10–20	179	1.141	0.970	<0.001	0.728	0.932	<0.001
20–30	174	1.161	0.965	<0.001	0.606	0.898	<0.001

SOC_CNS, the difference between STC and SIC; SOC_MWB, SOC determined by the MWB method.