Table 1 Regional distribution and variation in carbon density and storage of Chinese grasslands using three spatial interpolation methods.

Region	Area (10⁶ha)	C density (kg C m⁻²)					C storage (Pg C)			CV
Region	Area (10⁶ha)	AGBC ^§	BGBC	SOC	Ecosystem	AGBC	BGBC	SOC	Ecosystem	%
R1 ^‡	19.2	0.094^a†	0.369^ab	9.359^a	9.823^a	0.018	0.071	1.794	1.883	10.0
R1 ^‡	19.2	(0.012)	(0.015)	(0.979)	(0.981)	(0.002)	(0.003)	(0.188)	(0.188)
R2	63.6	0.059^b	0.345^ab	6.944^bc	7.348^b	0.037	0.219	4.415	4.672	3.9
R2	63.6	(0.001)	(0.016)	(0.268)	(0.284)	(0.001)	(0.010)	(0.170)	(0.180)
R3	76.8	0.062^b	0.285^a	7.792^b	8.139^b	0.048	0.219	5.984	6.250	6.6
R3	76.8	(0.005)	(0.036)	(0.565)	(0.535)	(0.004)	(0.028)	(0.434)	(0.411)
R4	153.8	0.046 ^c	0.416^ab	9.221^a	9.683^a	0.071	0.640	14.179	14.890	5.2
R4	153.8	(0.001)	(0.041)	(0.465)	(0.505)	(0.002)	(0.063)	(0.715)	(0.776)
R5	9.7	0.121^d	0.580^b	6.649^c	7.351^b	0.012	0.056	0.647	0.716	1.8
R5	9.7	(0.002)	(0.044)	(0.103)	(0.135)	(0.001)	(0.004)	(0.010)	(0.013)
R6	32.0	0.117^d	0.511^ab	9.012^a	9.639^a	0.037	0.163	2.882	3.083	7.5
R6	32.0	(0.010)	(0.117)	(0.614)	(0.721)	(0.003)	(0.037)	(0.196)	(0.231)
Total	355.05	0.083	0.418	8.163	8.664	0.223	1.369	29.902	31.494	5.5
Total	355.05	(0.001)	(0.029)	(0.475)	(0.504)	(0.001)	(0.085)	(1.654)	(1.74)

^†Data represent the mean and standard deviation (parentheses); data with the same lower letter in the same column indicates no significant differences at the P = 0.05 level.
^‡R1, temperate semi-humid meadow steppe regions; R2, temperate semi-arid steppe and desert steppe regions; R3, temperate and warm temperate arid desert and mountain steppe regions; R4, Qinghai-Tibet alpine regions; R5, warm temperate semi-humid and semi-arid shrub-tussock regions; R6, subtropical and tropical shrub-tussock regions (seeing Fig. 1).
^§AGBC, carbon density of the above-ground biomass; BGBC, carbon density of the below-ground biomass.

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