| Cite this article: | 丁紫娟.再生稻干湿交替灌溉与根区分层施氮减少温室气体排放[J].灌溉排水学报,0,():-. |
| DINGZijuan.再生稻干湿交替灌溉与根区分层施氮减少温室气体排放[J].灌溉排水学报,0,():-. |
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| Greenhouse mitigation by layered root-zone fertilization of nitrogen combined with alternating wetting and drying irrigation in the ratoon rice field. |
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DINGZijuan
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College of Agriculture, Yangtze University, Engineering Research Center of Ecology and Agricultural Use of Wet land Ministry of Education
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| Abstract: |
| Abstract：【Background】Rice field is an important source of greenhouse gas emissions. How to reduce greenhouse gas emissions from paddy fields through effective water and fertilizer management measures has become a research hotspot in the field of climate change.【Objective】To reduce greenhouse gas emissions from ratoon rice.【Method】The static chamber and gas chromatography method was used for in-situ field observation, and two kinds of irrigation modes (convention and alternating wetting and drying) and five fertilization treatments (No nitrogen, CK; farmer's regular urea nitrogen application, FFP; root-zone fertilization with 5cm deep of controlled-release urea, RF1; root-zone fertilization with 10 cm deep of controlled-release urea, RF2; double-deck root-zone fertilization with both 5 cm and 10 cm deep of controlled release urea, RF3) were set.【Results】①In all treatments, The CH4, N2O, and CO2 emissions of RF1, RF2, and RF3 treatments in the whole growth period were reduced by 49%~76%, 55%~81%, and 57%~69%, respectively, compared with FFP treatment under conventional irrigation mode (P<0.05); CH4, N2O and CO2 emissions in the dry-wet alternate mode were reduced by 52%~77%, 52%~73% and 61%~75%, respectively, compared with FFP treatment (P<0.05).②The GWP (CO2, kg·hm-2) caused by three greenhouse gases was reduced by 3%, 10%, 13% and 11% respectively under FFP, RF1, RF2 and RF3 treatment compared with conventional irrigation under wet and dry conditions (P<0.05).③ Compared with FFP treatment, RF3 treatment significantly increased the yield of ratoon rice by 7% and 11% under the two irrigation modes. 【Conclusion】The application of controlled-release urea in the root-zone can not only reduce greenhouse gas emissions but also increase rice yield, and the AWD saved irrigation water, and also increased yield of the ratoon rice with large greenhouse gas mitigation. Therefore, the combination of root-zone fertilization and optimized irrigation as the feasible measures could realize the simplified operation of ratoon rice. |
| Key words: ratoon rice; irrigation mode; root-zone fertilization; greenhouse gas; GWP |
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