Effect of soil compaction and fertilization on N N2O and CH 2O CH4 fluxesfrom agricultural arable soils in the Netherlands4

摘要

N2O and CH4 fluxes were measured at four different agricultural (arable) sites in the Netherlands under different fertilization and soil compaction treatments.After fertilization,higher N2O emissions (a factor 8) from the site cultivated with spinach were observed.The effect of fertilization on CH4 fluxes varied from no significant effect to conversion of a small sink into a net CH4 source.Heavy compaction increased N2O emissions by 20-50% compared to the traditional system,whereas using the riding track system resulted in a reduction of N2O emissions by 20-50%.For CH4,heavy compaction increased emissions by a factor 2-3 at two of the arable sites,and transformed a net sink into a net CH4 source at the other two sites.The application of the riding track system reduced CH4 emissions by a factor 2-12,and transformed two of the arable sites into net CH4 sinks.No significant effect of water-filled pore space (WFPS) was found.