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| Assessing nitrous oxide emissions and mitigation potentials from intensive vegetable ecosystems in China——Meta-analysis |
| Received:January 06, 2020 |
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| KeyWord:vegetable field;N2O;nitrogen fertilization;mitigation potential;meta-analysis |
| Author Name | Affiliation | E-mail | | WU Zhen | Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | CHEN An-feng | Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | ZHU Shuang-ge | Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | XIONG Zheng-qin | Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | zqxiong@njau.edu.cn |
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| Abstract: |
| In order to identify the contribution of vegetable production to nitrous oxide(N2O)emissions and mitigation potentials in China, we assessed N2O emissions from both fertilized open-field and greenhouse systems by integrating in-situ field observations from published literatures. A meta-analysis was conducted to investigate the effects of optimization measures such as nitrogen(N)reduction, nitrification inhibitor application, organic fertilizer substitution, biochar amendment and optimized irrigation on N2O mitigation potentials for vegetable ecosystems. Results indicated that N fertilizer application significantly increased N2O emissions though improved vegetable yield. Greenhouse production systems greatly decreased N2O emission factors and yield-scaled N2O emissions under high N amendment as compared to the open-field production system. Relative to the local farmer's practices, various optimization measures significantly decreased N2O emissions to varying degrees, such as 49.4% for reduced N fertilization, 33.2% for nitrification inhibitor, 26.6% for organic fertilizer substitution, 29.1% for biochar amendment and 34.3% for optimized irrigation, being 36.6% by average. Organic fertilizer substitution decreased both N2O emission factor and yield-scaled N2O emissions, especially under high N application inputs. N2O emissions decreased with the reduction of N fertilizer application rate while the N2O mitigating effects showed greater potentials under low N inputs. Optimized irrigation decreased N2O emissions across all N inputs, while nitrification inhibitor and biochar amendment had greater mitigation potentials under low N inputs. Various optimization measures such as nitrogen(N)reduction, nitrification inhibitor application, organic fertilizer substitution, biochar amendment and optimized irrigation manifested great potentials in mitigating N2O emissions from both open-field and greenhouse vegetable ecosystems while maintaining yields in China. Due to the higher intensification, greenhouse vegetable ecosystems presented greater mitigation consequences. |
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