Warming and altered precipitation rarely alter N addition effects on soil greenhouse gas fluxes: a meta-analysis

Wei, Xinyu; Wu, Fuzhong; Van Meerbeek, Koenraad; Desie, Ellen; Ni, Xiangyin; Yue, Kai; Heděnec, Petr; Yang, Jing; An, Nannan

doi:10.1186/s13717-023-00470-9

Ecological Processes

Table 1 Linear mixed-effects model analysis of the relationship between local climate, experimental, or edaphic conditions and the effects of N addition (N), warming (W), increased precipitation (IP), decreased precipitation (DP), N addition plus warming (W + N), N addition plus increased precipitation (IP + N), and N addition plus decreased precipitation (DP + N) on soil GHG fluxes

From: Warming and altered precipitation rarely alter N addition effects on soil greenhouse gas fluxes: a meta-analysis

\(\mathrm{ln}RR\)	Treatment	Aridity index		W/IP/DP magnitude		N addition rate		Duration		Soil pH		Soil moisture		Soil C		Soil N
\(\mathrm{ln}RR\)	Treatment	Estimate	n	Estimate	n	Estimate	n	Estimate	n	Estimate	n	Estimate	n	Estimate	n	Estimate	n
	N	0.009	399			0.025	399	0.005	399	0.014	399	0.044	178	0.018	126	0.033	60
	W	0.081	194	0.136*	194			− 0.010	194	0.043	194	− 0.076	75	0.016	33	0.023	31
	W + N	0.032	194	0.143*	194	− 0.049	194	− 0.044	194	0.096	194	− 0.061*	75	− 0.051	33	− 0.040	31
CO₂	IP	− 0.102*	111	0.082	111			0.039	111	− 0.071	111	− 0.234***	55	− 0.128	29	− 0.032***	13
	IP + N	− 0.072	113	0.169	113	− 0.125*	113	− 0.002	113	− 0.114	113	− 0.127*	55	− 0.023	29	− 0.049*	13
	DP	− 0.016	93	− 0.041**	93			− 0.027	93	0.000	93	0.073***	48	− 0.005	65	− 0.074	17
	DP + N	0.044*	93	− 0.032	93	0.024	93	− 0.024	93	− 0.023	93	0.043	48	0.063*	65	0.090*	17
	N	0.019	62			-0.159	62	0.026	62	− 0.072	62	− 0.325	32	− 0.052	27	0.230	28
	W	0.106	41	0.094	41			− 0.020	41	− 0.070	41	− 0.397***	15	0.122	23	− 0.102	23
	W + N	0.039	41	0.048	41	− 0.227*	41	− 0.049	41	-0.103	41	− 0.383*	12	0.205*	22	− 0.221*	22
CH₄	IP	− 0.668***	12	0.241	12			0.622	12	2.086	12	− 2.766	10
	IP + N	− 0.813*	12	0.472	12	0.191	12	0.023	12	1.444	12	− 3.474	10
	DP	− 0.307	9	-0.089	9			0.178	9	− 0.230	9	− 0.429	7
	DP + N	− 0.017	9	-0.166	9	0.110	9	0.058	9	− 0.183	9	− 0.162	7
	N	0.185*	240			0.017	240	0.048	240	− 0.165*	240	0.340**	53	− 0.173	176	− 0.040	176
	W	0.438	62	0.562***	62			0.049	62	0.021	62	0.237	37	0.009	53	− 0.064	53
	W + N	0.011	62	0.403*	62	− 0.230	62	0.011	62	− 0.037	62	0.022	37	− 0.006	53	− 0.002	53
N₂O	IP	0.098	169	0.113	169			− 0.053	169	− 0.124*	169	0.598*	7	0.008	122	− 0.088	119
	IP + N	0.106	169	0.102	169	0.098	169	0.137	169	− 0.138	169	− 0.141	7	− 0.096	122	0.051	119
	DP	− 0.102	9	− 0.753	9			0.313	9	− 0.764	9	− 0.318	9
	DP + N	− 0.103	9	− 0.074	9	− 0.146	9	0.015	9	− 0.017	9	− 0.363	9

Data are standardized prior to analysis. Bold estimate values indicate significant effects. *p < 0.05, **p < 0.01, ***p < 0.001

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