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| Simulation and reduction of CH4 flux emission in a rice-wheat rotation system in the Huai River Basin, China |
| Received:July 05, 2023 |
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| KeyWord:rice-wheat rotation farmland;climate change;CH4 flux;DNDC model;reduction measure;straw returning |
| Author Name | Affiliation | E-mail | | YU Xiaolan | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | ZHANG Fangmin | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | fmin.zhang@nuist.edu.cn | | FANG Yanqiu | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | LU Yanyu | Anhui Institute of Meteorological Sciences/Anhui Province Key Laboratory of Atmospheric Science and Satellite Remote Sensing, Hefei 230031, China
Shouxian National Climatology Observatory, Huai River Basin Typical Farm Eco-meteorological Experiment Field of CMA, Shouxian 232200, China | | | ZHANG Kaidi | Anhui Institute of Meteorological Sciences/Anhui Province Key Laboratory of Atmospheric Science and Satellite Remote Sensing, Hefei 230031, China | | | NI Ting | Shouxian National Climatology Observatory, Huai River Basin Typical Farm Eco-meteorological Experiment Field of CMA, Shouxian 232200, China | |
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| Abstract: |
| To study the impact of different management measures on CH4 fluxes in rice-wheat rotation cropland ecosystems in the Huai River Basin under future climate change scenarios, the CH4 fluxes and their spatiotemporal characteristics during the historical period (2000-2020)and the future(2021-2049)under RCP4.5(medium emission intensity)and RCP8.5(high emission intensity)scenarios were estimated using the DeNitrification-DeComposition(DNDC)model following parameter calibration. Compared with the basic measure during the historical period, the CH4 reduction capacities of different field management measures were evaluated under different future climate change scenarios. The following results were obtained. The average emission intensity of regional CH 4 flux in the basin during the historical period was 125.3 kg · hm-2, whereas those in the future were 140.5 kg · hm-2 and 150.5 kg · hm-2 under RCP4.5 and RCP8.5 scenarios, respectively. Furthermore, they all exhibited significant upward trends(P<0.01). The spatial distribution characteristics of CH4 flux were similar under the two future scenarios, with high and low CH4 fluxes in the southern and northwestern and northeastern and central western regions, respectively. Compared with the basic measure, different fertilizer application measures reduced CH 4 emissions, whereas straw returning measures increased them. Hence, when only CH4 flux in the Huai River Basin was regulated, the optimal field management measure under the two future climate change scenarios was no return straw to the field with a 20% reduction in fertilizer application. |
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