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Fig. 7. Mean stream vs. near-stream groundwater phosphorus concentrations. Phosphorus concentration values are based on annual average (December 2000 through December 2001; n = 12). Shown are: (a) urban soluble reactive phosphorus (SRP), (b) nonurban SRP, (c) urban total phosphorus (TP), and (d) nonurban TP. Error bars are ± 1 standard error (SE) from the mean. Solid lines indicate significant linear regression slopes (for 7b, adj. R2 = 0.975; for 7d, adj. R2 = 0.573) between stream water and near-stream groundwater phosphorus concentrations (after Sonoda et al., 2002).
