Table 2. Results of linear regression between methane emission and environmental factors.

	Based on all data points (log-transformed)		Based on mean value per species
Factor	R squared	p-value	R squared	p-value
Plant Biomass	0.005	0.61	0.011	0.78
Soil pH	0.004	0.65	0.049	0.56
Soil extractable NH4– Nitrogen	0.009	0.49	0.120	0.35
Air Temperature	0.088 *	0.03	0.001	0.92
Soil moisture	0.001	0.86	0.112	0.37
Water table	0.012	0.42	0.075	0.47

Soil variables were measured in the top 30 cm.

P≤0.05; **P≤0.01; ***P≤0.001.