Table 4. Effects of environmental factors on biomass carbon and SOC density in a linear mixed-effects model (LME).

		Alpine grassland			Winter pasture			Summer pasture
		j df	F	k P	df	F	P	df	F	P
AGB a carbon Density (g C m-2)	GT d	1	1.18	0.28
	GS e	1	6.84	0.01
	T f	1	3.82	0.05	1	5.68	0.02	1	1.12	0.30
	P g	1	0.75	0.39	1	0.14	0.71	1	1.76	0.20
	GD h	1	0.81	0.37	1	0.00	0.98	1	3.93	0.05
	T×P i	1	1.93	0.17	1	4.80	0.03	1	1.70	0.20
	A	Alpine grassland				Alpine steppe			Alpine meadow
BGB b carbon density (g C m-2)	GT	1	14.70		<0.001
	GS	1	1.84	0.18
	T	1	5.42	0.02	1	0.85	0.37	1	4.56	0.04
	P	1	0.69	0.41	1	1.12	0.31	1	4.31	0.04
	GD	1	0.24	0.63	1	0.85	0.37	1	1.14	0.29
	T×P	1	7.34	0.01	1	1.09	0.31	1	4.62	0.04
SOC c density (kg C m-2)	GT	1	14.36	<0.001
	GS	1	3.44	0.07
	T	1	0.59	0.44	1	8.21	0.01	1	0.43	0.52
	P	1	0.11	0.73	1	0.16	0.70	1	0.13	0.72
	GD	1	12.35	<0.001	1	0.25	0.62	1	7.43	0.01
	T×P	1	0.03	0.87	1	9.04	0.01	1	0.94	0.34
Ecosystem carbon density (kg C m-2)	GT	1	17.11	<0.001
	GS	1	4.37	0.04
	T	1	1.01	0.32	1	6.00	0.03	1	0.30	0.59
	P	1	0.00	0.99	1	0.02	0.89	1	0.46	0.50
	GD	1	8.44	0.004	1	10.70	0.004	1	4.66	0.03
	T×P	1	0.16	0.69	1	5.66	0.03	1	0.71	0.40

^a AGB carbon density, aboveground biomass carbon density

^b BGB carbon density, belowground biomass

^c SOC density, soil organic carbon density

^d GT, grassland types, including alpine steppe and alpine meadow

^e GS, grazing season, including winter pasture and summer pasture

^f T, temperature

^g, precipitation

^h GD, grazing intensity

ⁱ T×P, temperature × precipitation.

^jdf: degree of freedom

^k P-values < 0.05.