Fig. 5. Comparison of annual average (with standard errors, n = 12) of in situ (DNT) and potential (ANACN) denitrification rates in soil profiles along the three topohydrosequences. (Statistical differences between in situ and potential are given by asterisks: ***, p 0.001; **, p 0.01; *, p 0.05; ns, nonsignificant.)