Effect of persistent subsoil compaction on N2O emissions from arable soils

摘要

Compaction occasionally increased N2O in soil air.udNo large differences in soil air composition, N2O emissions or moisture content were found between the treatments.udThe N2O concentrations at 15, 30, 50 and 70 cm depths correlated positively with the emission of N2O from the soil in both fields (r=0.4-0.7***).udThe subsoil O2 concentrations correlated negatively with N2O emission, but only at the Finnish site.udThe results suggest that subsoil compaction does not significantly increase N2O emissions from these soils 15-30 years after compaction. This may indicate a minor role of subsoil in the production of N2O compared with topsoil.