title: N2:O emissions from a cultivated Andisol after application of nitrogen fertilizers with or without nitrification inhibitor under soil moisture regime.
abstract: The aim of this work was to examine the emission of N2O from soils following addition of nitrogen fertilizer with a nitrification inhibitor (+inh) or without the nitrification inhibitor(-inh) at different soil water regime. Higher soil moisture contents increased the total N2O emissions in all treatments with total emissions being 7 times larger for the CK and > 20 times larger for the fertilizer treatments at 85% WFPS (soil water filled pore space) than at 40% WFPS. The rates of N2O emissions at 40% WFPS under all treatments were small. The maximum emission rate at 55% WFPS without the nitrification inhibitor (-inh) occurred later (day 11) than those of 70% WFPS (-inh) samples (day 8). The inhibition period was 4-22 d for 55% WFPS and 1-15 d for 70% WFPS comparing the rates of N2O emissions treated (+inh) with (-inh). The maximum emission rates at 85% WFPS were higher than those at the other levels of soil water content for all treatments. The samples (+inh) released less N2O than (-inh) samples at the early stage. Nevertheless, N2O emissions from (+inh) samples lasted longer than in the (-inh) treatment. Changes in mineral N at 55%, 70% and 85% WFPS followed the same pattern. NH4(+) -N concentrations decreased while NO3(-) -N concentrations increased from the beginning of incubation. NH4(+) -N concentrations from 40% WFPS treatment declined more slowly than those of the other three levels of soil water content. Nitrification was faster in the (-inh) samples with 100% NH4(+) -N nitrified after 22 d (50% WFPS) and 15 d (70% and 85% WFPS). N2O emissions increased with soil water content. Adding N-fertilizer increased emissions of N2O. The application of the nitrification inhibitor significantly reduced total N2O emissions from 30.5% (at 85% WFPS) to 43.6% (at 55% WFPS).
authors.affiliation: Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. xhfan@issas.ac.cn
authors.forename: Xiao-Hui
authors.initials: XH
authors.lastname: Fan
authors.forename: Tsuruta
authors.initials: T
authors.lastname: Haruo
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002849:Chromatography, Gas; D003124:Colorimetry; D005308:Fertilizers / Q000032:analysis*; D007564:Japan; D009609:Nitrous Oxide / Q000737:chemistry*; D012987:Soil / Q000032:analysis*; D013997:Time Factors; D014508:Urea; D014867:Water / Q000737:chemistry
chemical_list: D000393:Air Pollutants; D005308:Fertilizers; D012987:Soil; D014867:Water; D014508:Urea; D009609:Nitrous Oxide