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| Effects of biochar application on greenhouse gas emissions and yield in a double-season rice cropping system under various optimized nitrogen reduction conditions |
| Received:January 29, 2023 |
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| KeyWord:greenhouse gas emission;biochar;rice;optimal nitrogen reduction;yield |
| Author Name | Affiliation | E-mail | | LI Dandan | College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | HE Hao | College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | PAN Feifan | College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | YANG Shuyun | College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | yangshy@ahau.edu.cn |
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| Abstract: |
| This study aimed to investigate the effects of biochar application on greenhouse gas emissions and rice yield in a double-season rice cropping system under different optimized nitrogen reduction conditions. Five treatments were set up:conventional nitrogen fertilizer application(CF), optimized reduced nitrogen fertilizer 15%(OF15%), optimized reduced nitrogen fertilizer 15% + biochar(OF15%+B), optimized reduced nitrogen fertilizer 30%(OF30%), and optimized reduced nitrogen fertilizer 30% + biochar(OF30%+B). Static chamber gas chromatography was used to monitor CH4 and N2O emission fluxes during rice growth, and determine the soil physicochemical indicators and rice yield. The results showed that compared with CF, all treatments reduced the cumulative CH4 and N2O emissions from double-season rice soils by 9.59%-39.60% and 20.12%-41.61%, respectively. Among them, the best reduction in CH4 was achieved by OF30% +B and OF15% +B treatments, reaching 39.60% and 31.53%, respectively. The best effect of N2O reduction in the OF30% +B treatment reached 41.61%, followed by the OF30% and OF15% + B treatments, reaching 34.56% and 28.14%, respectively. All the treatments reduced the global warming potential produced by soil greenhouse gases in the double-season rice system by 9.54%-39.27%. The OF15%+B achieved the highest yield, increasing by 2.83% compared with CF, whereas OF30% and OF30%+B had some risk of yield reduction, decreasing by 5.85% and 4.20%, respectively. The greenhouse gas emission intensity (GHGI) was reduced in all treatments relative to CF, with OF30%+B effectively reducing the GHGI of the entire double-season rice system by 36.74%, followed by OF15%+B treatment with a reduction of 33.09%, both of which have a great potential to reduce GHGI. The application of biochar increased soil pH, soil organic matter content, soil nitrate, and ammonium nitrogen content, and improved soil fertility, which may be crucial for biochar to regulate soil greenhouse gas emissions. Overall, the OF15% + B rice yield is the highest among the treatments and has the greatest greenhouse gas reduction potential for sustainable agricultural development. |
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