Figure 1. Relationship between the absorbance of soil water from 702 individual soils measured in the UV (254 nm) range and DOC concentration (Panel A), the relationship between total soluble phenolics and either solution absorbance at 400 nm (Panel B) or DOC concentration (Panel C).
The lines are linear regression for all the data in the plots (Panel A, r 2 = 0.579; y = 0.387+0.301x; Panel B, r 2 = 0.432; y = 0.12+0.139x; Panel C, r 2 = 0.375; y = 0.025+0.068x).