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Nitrous oxide emission measurement with acetylene inhibition method in paddy fields under flood conditions
Authors:Toshiaki Iida  Sanjit Kumar Deb  Ram Gopal Kharbuja
Institution:(1) Department of Bioproduction, Faculty of Agriculture, Yamagata University, 1-23 Wakaba, Tsuruoka, Yamagata 997-8555, Japan;(2) Soil Physics and Soil Hydrology Laboratory, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan;(3) Department of Hydrology and Meteorology, The Government of Nepal, Babarmahal, Kathmandu, PO Box 406, Nepal
Abstract:Nitrous oxide (N2O) emission from flooded rice paddy fields was continuously measured by the closed chamber method at an experimental plot in Thailand for a whole cultivation period. To characterize the N2O emission with regard to the denitrification N loss, the C2H2 inhibition method was applied. Flood water on the soil greatly suppressed the N2O emission. The N2O emission was mitigated considerably by even a thin film of the flood water. The overall average N2O emissions under flood conditions for one crop season (83 days) at the control site and the C2H2 treated site were 10.3 and 11.8 μg N m−2 h−1, respectively. The N2O emission from the C2H2 treated site was consistently higher than that from the control site and the N2O emission from both sites followed the same diurnal and seasonal variation pattern, indicating the effect of denitrification inhibition by the supplied C2H2. The N2O emission enhanced along with temperature increase when NO3–N concentration in the soil water was above 0.4 mg N l−1 and soil temperature was above 24°C, suggesting specific temperature influence over the emission. The increase in NO3–N concentration and temperature in the soil affected only the N2O emission while the difference in the emission at the C2H2 treated site and the control site was not so much affected. It was suggested that most of the actively produced N2O under higher NO3–N concentration and temperature would likely to quickly emit to the atmosphere rather than to undergo further reduction to N2.
Keywords:Nitrous oxide emission  Paddy field  Flooded soil  Acetylene inhibition method  Rice cultivation  Flooded period
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