Response of Soil C and N, Dissolved Organic C and N, and Inorganic N to Short-Term Experimental Warming in an Alpine Meadow on the Tibetan Plateau

Table 1

Repeated-measures ANOVA (𝐹 values) for the main and interactive effects of experimental warming (W) and sampling date (D) on soil organic C (SOC), total N (TN), dissolved organic C (DOC), N (DON), ammonium N (NH₄⁺-N), nitrate N (NO₃⁻-N), the ratio of NH₄⁺-N to NO₃⁻-N (NH₄⁺-N/NO₃⁻-N), and soil inorganic N (N_min, i.e., sum of NH₄⁺-N and NO₃⁻-N) in an alpine meadow on the Tibetan Plateau at three elevations (𝑛=4).

Elevation	Model	SOC	TN	DOC	DON	DOC/DON	NO3^−-N	NH4^+-N	NH4^+-N/NO3^−-N	Nmin
4313 m	W	0.02	1.58	0.00	0.23	0.70	39.02**	4.22	1.38	26.87**
	D	0.31	0.26	16.70***	3.66	2.68	55.47***	10.98**	10.04**	28.71***
	W × D	1.04	6.87*	4.13*	2.51	1.40	6.32*	3.44	0.49	5.91*
4513 m	W	1.43	0.03	4.07	5.33	4.52	9.90*	6.45*	3.01	10.89*
	D	2.62	0.23	94.06***	0.99	5.23	57.26***	31.90***	13.69***	51.19***
	W × D	0.41	3.35	2.32	6.36*	6.15*	11.70**	0.63	8.10**	4.39*
4693 m	W	0.40	2.61	0.07	0.09	0.04	0.26	0.00	0.19	0.14
	D	1.96	0.12	0.67	7.80**	0.81	20.22***	21.83***	3.36	29.26***
	W × D	0.27	3.89	0.33	3.84	0.34	0.12	2.66	0.88	1.47

∗, ∗∗, and ∗∗∗ indicate 𝑃<0.05, 𝑃<0.01, and 𝑃<0.001, respectively, while no asterisk indicates not significant.