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| Effects of nitrification inhibitor, crop residues, and biochar applications on N2O emissions by subtropical agricultural soils |
| Received:September 15, 2017 |
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| KeyWord:N2O emissions;nitrification inhibitor;crop residues;biochar |
| Author Name | Affiliation | E-mail | | ZHAO Ying | School of Geography Sciences, Nanjing Normal University, Nanjing 210023, China | | | ZHANG Jin-bo | School of Geography Sciences, Nanjing Normal University, Nanjing 210023, China
Key Laboratory of Virtual Geographic Environment(Nanjing Normal University), Ministry of Education, Nanjing 210023, China
State Key Laboratory Cultivation Base of Geographical Environment Evolution(Jiangsu Province), Nanjing 210023, China
Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China | | | CAI Zu-cong | School of Geography Sciences, Nanjing Normal University, Nanjing 210023, China
Key Laboratory of Virtual Geographic Environment(Nanjing Normal University), Ministry of Education, Nanjing 210023, China
State Key Laboratory Cultivation Base of Geographical Environment Evolution(Jiangsu Province), Nanjing 210023, China
Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China | zccai@njnu.edu.cn |
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| Abstract: |
| The effects of a nitrification inhibitor(nitrapyrin), crop residues, and rice straw-derived biochar applications on N2O emissions by an acidic agricultural soil from Jiangxi Province(JX) and an alkaline agricultural soil from Sichuan Province(SC) were investigated using a laboratory incubation experiment. The results showed that nitrapyrin significantly reduced N2O emissions in both soils during the first stage(24 h) after addition, especially in the SC soil where the N2O emission was reduced by 62%. Biochar application significantly enhanced N2O emission in the JX soil, but its effects in the SC soil were not significant. In contrast, the effects of crop residue incorporation on soil N2O emissions depended on the type and characteristics of the crop residues, the physicochemical properties of the soil, and how long the residues had been incorporated into the soil. Over the short term(24 h), alfalfa and rice straw significantly enhanced N2O emissions, whereas bagasse addition did not lead to any significant increases in N2O emissions from the SC soil. The N2O emissions in the JX soil were significantly enhanced by rice straw application, but significantly inhibited by alfalfa and bagasse applications. Increasing the duration of incorporation weakened the effects of alfalfa and rice straw on N2O emissions, whereas the inhibition effect of bagasse on N2O emissions could be maintained for 6 months. Overall, these results highlight the necessity to connect N2O mitigation strategies with soil types and properties when attempting to reduce N2O emissions. |
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