Methane and nitrous oxide emissions and their GWPs: research on different irrigation modes in a rice paddy field
by Mengxue Wang; Zhongxue Zhang; Yanyu Lin; Chunbo Lv; Dan Xu
International Journal of Environmental Engineering (IJEE), Vol. 8, No. 4, 2016

Abstract: CH₄ and N₂O emission fluxes from a rice paddy field were measured in the cold region of Heilongjiang under four irrigation modes (control irrigation, wet irrigation, intermittent irrigation, and flood irrigation) by the static chamber-gas chromatograph technique. The emission rates of CH₄ and N₂O were simultaneously monitored once a week. The net global warming potential (GWP) was calculated as CO₂ equivalents. The CH₄ and N₂O emission peak appeared in the rice active growth period, while the emissions were reduced in the remaining period regardless of the irrigation method utilised. The CH₄ emission under flood irrigation was the highest, whereas that of the wet irrigation was 27.2% lower; the control and the intermittent irrigation manifested a decrease by 34% and 48.2%, respectively. N₂O emission under flood irrigation was 0.41 kg•hm⁻² smaller than that in the intermittent irrigation, but it was higher than those in the control and wet irrigation, respectively. By applying water-saving irrigation techniques, the greenhouse gas emissions from paddy fields can be effectively decreased.

Online publication date: Fri, 28-Jul-2017

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