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

Table 8

Correlation coefficients among environmental factors, flux, and RDA ordination axes.

Environment factors	Resp Ax1	Resp Ax2
CO2		−0.0003
CH4	0.1018	0.9933
T	0.5731	0.3045
Tw	0.5044	0.3105
Wind rate	0.3524	0.1697
Flow rate	0.4124	−0.1248
pH	−0.3537	−0.2276
DO	−0.2626	−0.4917
ORP	−0.1679	−0.6412
COND	−0.1521	−0.1569
Tur	0.0927	0.6894
TN	0.5365	0.2512
N-	0.4695	0.3059
N-	0.1364	−0.1730
N-	0.3705	−0.0120
	0.5450	0.3683
OM	0.4938	0.4747
TNs	0.2038	0.1964
N-s	0.2875	0.2514

The bold numerical values suggest that the absolute values of the correlation coefficient (R) between environmental factors and corresponding RDA ordination axis 1 or axis 2 are more than 0.25.