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

Figure 9

The schematic diagram of identification of environmental factors affecting the fluxes of CO₂ and CH₄. Pearson and Spearman: the correlation analysis of Pearson and Spearman; MSRA: multiple stepwise regression analysis; RDA: redundancy analysis; T: atmospheric temperature; Tw: water temperature; wind: wind velocity; Wf: water flow rate; DO: dissolved oxygen; ORP: oxidation-reduction potential; COND: conductance; Tur: turbidity. The color change from green to red shows the increase of importance on the effect of CO₂ and CH₄ fluxes. For the calculation method see Section 2.3.3.