Fig. 5. a. Comparison of inputs (precipitation), outputs (riverine), and the resulting mass balance (net export) of selected major solutes. Values are annual means in Mg yr^-1 for the period of study. Numbers are ranked from upriver (1–4 and 9) to downriver (5–8 and 10) sampling sites to show possible trends in river chemistry.

b. Comparison of inputs (precipitation), outputs (riverine), and the resulting mass balance (net export) of selected major solutes. Values are annual means in Mg yr^-1. Numbers are ranked from upriver (1–4 and 9) to downriver (5–8 and 10) sampling sites.