| Cite this article: | 李熠凡,李烙布,李伏生.不同灌溉施氮模式下稻田甲烷和氧化亚氮排放[J].灌溉排水学报,2021,():-. |
| LI Yifan,LI Luobu,LI Fusheng.不同灌溉施氮模式下稻田甲烷和氧化亚氮排放[J].灌溉排水学报,2021,():-. |
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| Methane and nitrous oxide emissions from double-cropping rice field under different irrigation and nitrogen application modes |
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LI Yifan, LI Luobu, LI Fusheng
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College of Agriculture,Guangxi University
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| Abstract: |
| Abstract: 【Objectives】The objective of this study was to investigate the effect of different irrigation and nitrogen application modes on methane (CH4) and nitrous oxide (N2O), so as to obtain the irrigation and nitrogen (N) application mode for lowering greenhouse gas (GHG) emission in rice field. 【Methods】 CH4 and N2O fluxes from rice field, global warming potential (GWP) and GHG emission intensity (GHGI) were determined under three irrigation modes (conventional irrigation CR, "thin-wet-dry" irrigation TR and alternate wetting and drying irrigation DR), and three N treatments (FN1: 120 kg N hm-2, 20% basal fertilizer, 80% topdressing, FN2: 120 kg N hm-2, 50% basal fertilizer, 50% topdressing and FN3: 90 kg N hm-2, 50% basal fertilizer, 50% topdressing) using the double-cropping rice field experiments. 【Results】 Compared to CR mode, DR mode increased the total yield of two rice seasons by 17.9% and 21.1% under FN1 and FN3, respectively. FN1 increased the yield of early rice and total yield of two rice seasons by 13.4% and 11.4%, and 16.1% and 12.6% under TR and CR modes, respectively, when compared to FN2. FN2 increased early rice yield by 11.0% under DR mode by comparing with FN3. The total yield of two rice seasons in DR-FN1 was the highest. In comparison with CR mode, 【Conclusions】TR and DR modes reduced the cumulative CH4 emissions from double-cropping rice field over the whole growth period by 17.1-22.5% and 43.0-56.8% under FN1, FN2 and FN3, but increased the cumulative N2O emissions under FN1 and FN2 by 69.3-85.2% and 146.2-160.7%, respectively. Compared to FN2, FN3 decreased the cumulative CH4 and N2O emissions from double-cropping rice field over the whole growth period by 26.8% and 32.3% under TR mode, respectively. TR and DR modes had lower GWP and GHGI than CR mode, and DR mode had the lowest GWP and GHGI. FN1 and FN3 had lower GHGI than FN2, and FN1 had the lowest GHGI. Thus TR and DR modes should be used instead of CR mode to reduce GWP and GHGI under different N treatments, and low N rate and less basal fertilizer and more topdressing should be used to mitigate GWP and GHGI under TR and DR modes, and DR-FN1 treatment was a suitable irrigation and nitrogen mode, which can increase rice yield and reduce GWP and GHGI.
Keywords: “Thin-wet-dry” irrigation; Alternate wetting and drying irrigation; CH4 and N2O emission; Global warming potential; Greenhouse gas emission intensity |
| Key words: “Thin-wet-dry” irrigation; Alternate wetting and drying irrigation; CH4 and N2O emission; Global warming potential; Greenhouse gas emission intensity |
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