N-NH4+ N-NO2- N-NO3- P-PO43- TSS
mg·dm-3
Arable land 0.09–0.92 0.05–1.28 0.05–1.49 0.04–0.16 5.43–25.35
Grasslands 0.04–0.96 0.22–0.48 0.75–2.86 0.09–0.34 0.20–12.04
Forests 0.06–1.50 0.08–0.12 0.04–1.04 0.08–0.25 0.51–5.02