N-NH4+ N-NO2- N-NO3- P-PO43- TSS
mg·dm-3
Arable land 0.05–0.89 0.08–0.95 0.09–6.25 0.03–0.89 4.94–18.34
Grasslands 0.02–0.73 0.65–0.68 0.45–1.84 0.04–0.63 0.93–9.92
Forests 0.03–2.54 0.03–1.47 0.02–1.74 0.03–0.85 0.71–5.92