Table 2 Estimation of carbon density and storage of Chinese grasslands using three different grassland classifications (different scales).

Grassland type groups	Area (10⁶ha)	C density (kg C m⁻²)				C storage (Pg C)				CV
Grassland type groups	Area (10⁶ha)	AGBC ^‡	BGBC	SOC	Ecosystem	AGBC	BGBC	SOC	Ecosystem	(%)
Steppe	138.20	0.059^a†	0.354^a	6.497^ac	6.910^ac	0.081	0.489	8.979	9.549	5.2
Steppe	138.20	(0.010) ^†	(0.109)	(0.474)	(0.356)	(0.013)	(0.151)	(0.655)	(0.492)
Meadow	119.19	0.067^a	0.508^b	11.633^b	12.208^b	0.080	0.605	13.866	14.551	5.5
Meadow	119.19	(0.008)	(0.041)	(0.622)	(0.668)	(0.009)	(0.049)	(0.741)	(0.797)
Desert	61.61	0.048^a	0.075^c	5.617^a	5.740^a	0.029	0.047	3.460	3.536	7.6
Desert	61.61	(0.008)	(0.021)	(0.460)	(0.438)	(0.005)	(0.013)	(0.283)	(0.270)
Shrub-tussock	34.77	0.139^b	0.718 ^d	7.292^c	8.148^c	0.048	0.250	2.535	2.833	13.0
Shrub-tussock	34.77	(0.022)	(0.022)	(1.013)	(1.057)	(0.008)	(0.008)	(0.352)	(0.367)
Total	353.77	0.078	0.414	7.760	8.251	0.239	1.390	28.841	30.470	2.2
Total	353.77	(0.006)	(0.041)	(0.157)	(0.182)	(0.018)	(0.204)	(0.135)	(0.283)

^†Data represent the mean and standard deviation (parentheses); data with the same lower letter in the same column indicate no significant differences at the P = 0.05 level.
^‡AGBC, carbon density of the above-ground biomass; BGBC, carbon density of the below-ground biomass.

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