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| Effects of different fertilization regimes on nitrous oxide emissions from a tropical pepper cropping system in Hainan |
| Received:December 31, 2024 |
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| KeyWord:nitrous oxide;pepper;tropical region;optimal nitrogen application;nitrogen use efficiency;nitrogen surplus |
| Author Name | Affiliation | E-mail | | QIN Yu | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | TIAN Xue | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | DU Jiayao | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | WANG Shouxiang | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | LI Peng | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | ZHANG Chong | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | JU Xiaotang | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | juxt@cau.edu.cn |
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| Abstract: |
| Studying the emission characteristics and influencing factors of N2O in tropical pepper soil in Hainan through different fertilization modes. The experiment involved five treatments：no nitrogen（N0）, conventional nitrogen application（Ncon）, optimal nitrogen application（nitrogen fertilizer reduction by 40%, Nopt）, optimal nitrogen application combined with a nitrification inhibitor（Nopt + NI）, optimal nitrogen application combined with a biochar（Nopt +B）. During the growth period of peppers, the dynamic of N2O fluxes, climate factors, and soil factors were monitored. Additionally, the yield and nitrogen uptake at the maturity stage of peppers were measured. Correlation analysis showed that nitrogen application rate, soil temperature, moisture, and NO-3-N content were the main factors driving N2O emission. Compared with Ncon, the optimal fertilizations of Nopt, Nopt + NI, and Nopt + B decreased N2O emissions by 44%, 84%, and 64%, respectively, and significantly reduce nitrous oxide emission factor by 15%, 86%, and 49%, as well as yield-scale N2O emissions by 42%, 83%, and 67%, respectively. The three optimal treatments did not compromise pepper yield, nitrogen uptake, or nitrogen use efficiency compared with Ncon. However, they significant reduced soil nitrogen surplus by 44% - 50%. Among the three treatments, the addition of biochar was the most effective in increasing production and reducing nitrogen surplus. Studies have shown, the three optimal fertilization regimes can reduce N2O emissions. Consequently, considering nitrogen use efficiency, nitrogen surplus, and carbon sequestration, optimizing the application of biochar with fertilizers has the best effect on reducing emissions. |
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