Table 5. Remaining fraction of carbon or dry weight from wheat and maize residues after 1-2 years of field incubation.

Location	Incubation time (yr)	Maize		Wheat		Maize:wheat
		Straw	Root	Straw	Root	Straw	Root
Beijinga (39°57′N, 116°19′E)	1	0.215	0.23	0.278	0.382	0.77	0.60
	2	0.177	0.185	0.241	0.347	0.73	0.53
Hailunb (47°26′N, 126°38′E)	1		0.391		0.549		0.71
	2		0.313		0.42		0.75
Hailunc (47°26′N, 126°38′E)	1	0.537		0.441		1.22
	2	0.300		0.245		1.22
Fengqiuc (35°00′N, 114°24′E)	1	0.235		0.353		0.67
	2	0.123		0.234		0.52
Yingtanc (28°15′N, 116°55′E)	1	0.319		0.295		1.08
	2	0.199		0.234		0.85

^aValues were the fraction of carbon remaining in Wang et al.³⁷;

^bValues were the fraction of carbon remaining in Liu et al.³⁶;

^cValues were the fraction of mass remaining in Wang et al.¹⁰.