Table 3. Uncertainty analyses of the maize:wheat ratios in C input and retention coefficient using different root:shoot ratios (R_RS)^*.

Method	Maize:wheat in C input**		Retention coefficient
		Maize	Wheat	Maize:wheat
Reference		0.112	0.244	0.46
IPCC2006	1.27 ± 0.49	0.121	0.246	0.49
Li1994	1.04 ± 0.44	0.105	0.182	0.58
BW1997	1.02 ± 0.37	0.107	0.165	0.65

^*R_RS values for wheat and maize were set to 0.24 and 0.29 in the reference³², 0.24 and 0.22 in the IPCC2006³³, 0.43 and 0.35 in the Li1994³⁴, and 0.50 and 0.33 in the BW1997³⁵ methods.

^**Mean ± standard deviation.