Abstract
A greenhouse experiment was conducted with a specially designed apparatus consisting of an upper and lower chamber where the treatment with rice was carried out (treatment 1). The apparatus also had a single chamber where treatment 2, without rice plants, was carried out. The scope of this study was to elucidate the influence of rice plant growth on gaseous N losses as N2 and N2O produced by nitrification-denitrification in a flooded soil fertilized with (NH4)2SO4 (with 56.50 atom% 15N). Gas samples were withdrawn weekly and analyzed for (N2 + N2O)-15N losses by mass spectrometer and for N2O by gas chromatograph. The gaseous (N2 + N2O)-15N losses of the treatment with rice plants were significantly (P =0.01) higher than those of the treatment without rice plants, as were the amounts of N2O emitted. Rice plants facilitate the efflux of N2 and N2O from soil to atmosphere, as about half of the total gaseous 15N loss as N2 and N2O was found in the upper chamber. The proportion of N2O-15N to (N2 + N2O)-15N in the upper chamber was 10.56%, much higher than that of the lower chamber in treatment 1 and the headspace of treatment 2.
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This research was financially supported by the National Natural Science Foundation of China (no. 30390080) and National Key Basic Research and Development Program (no. 2002CB410807).
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Ni, Wz., Zhu, Zl. Evidence of N2O emission and gaseous nitrogen losses through nitrification-denitrification induced by rice plants (Oryza sativa L.). Biol Fertil Soils 40, 211–214 (2004). https://doi.org/10.1007/s00374-004-0758-y
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DOI: https://doi.org/10.1007/s00374-004-0758-y