Understanding the Spatial Heterogeneity of CO₂ and CH₄ Fluxes from an Urban Shallow Lake: Correlations with Environmental Factors

Table 5

Coefficients.

Dependent variable	Model		Unstandardized coefficients		Standardized coefficients	t	Sig.	Collinearity statistics
			B	Std. error	Beta			Tolerance	VIF
lg CO2	1	(Constant)	−4.670	1.364		−3.423	0.003
		T	0.221	0.050	0.742	4.426	0.000	1.000	1.000
	2	(Constant)	−6.119	1.044		−5.863	0.000
		T	0.187	0.037	0.629	5.086	0.000	0.948	1.055
		OM	0.580	0.145	0.495	4.008	0.001	0.948	1.055
	3	(Constant)	0.499	3.221		0.155
		T	0.147	0.038	0.495	3.896	0.002	0.722	1.386
		OM	0.469	0.140	0.401	3.359	0.005	0.819	1.221
		pH	−0.624	0.290	−0.294	−2.147	0.050	0.624	1.603
lg CH4	1	(Constant)	−2.206	0.354		−6.239	0.000
		Tur	0.077	0.016	0.776	4.918	0.000	1.000	1.000
	2	(Constant)	−2.625	0.344		−7.622	0.000
		Tur	0.068	0.014	0.689	4.936	0.000	0.942	1.061
		NH4	0.422	0.163	0.361	2.583	0.021	0.942	1.061

The bold numerical values are the optimal solution.