Pedosphere 26(4): 533--548, 2016
ISSN 1002-0160/CN 32-1315/P
©2016 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Alternate wetting and drying of rice reduced CH4 emissions but triggered N2O peaks in a clayey soil of central Italy |
A. LAGOMARSINO1 , A. E. AGNELLI1, B. LINQUIST2, M. A. ADVIENTO-BORBE2, A. AGNELLI3, G. GAVINA4, S. RAVAGLIA4 and R. M. FERRARA5 |
1Consiglio per la Ricerca in agricoltura e l’analisi dell’Economia Agraria, centro di ricerca per l’AgroBiologia e la Pedologia, 50121 Firenze (Italy)
2Department of Plant Sciences, University of California, Davis, CA95616 (USA)
3Dipartimento di Scienze Agrarie, Alimentari e Ambientali, Università di Perugia, 06123 Perugia (Italy)
4Società Italiana Sementi, S. Lazzaro di Savena, 40068 Bologna (Italy)
5Consiglio per la Ricerca in agricoltura e l’analisi dell’Economia Agraria, Research Unit for Cropping Systems in Dry Environments, 70125 Bari (Italy) |
| ABSTRACT |
| Reducing CH4 and N2O emissions from rice cropping systems while sustaining production levels with less water requires a better understanding of the key processes involved. Alternate wetting and drying (AWD) irrigation is one promising practice that has been shown to reduce CH4 emissions. However, little is known about the impact of this practice on N2O emissions, in particular under Mediterranean climate. To close this knowledge gap, we assessed how AWD influenced grain yield, fluxes and annual budgets of CH4 and N2O emissions, and global warming potential (GWP) in Italian rice systems over a 2-year period. Overall, a larger GWP was observed under AWD, as a result of high N2O emissions which offset reductions in CH4 emissions. In the first year, with 70% water reduction, the yields were reduced by 33%, CH4 emissions decreased by 97%,while N2O emissions increased by more than 5-foldunder AWD as compared to PF;in the second year, with a 40% watersaving,the reductions of rice yields and CH4 emissions (13% and 11%, respectively) were not significant, but N2O fluxes more than doubled. The transition from anaerobic to aerobic soil conditions resulted in the highest N2O fluxes under AWD. The duration of flooding, transition to aerobic conditions, water levelabove the soil surface, and the relative timing between fertilization and flooding were the main drivers affecting greenhouse gas mitigation potential under AWD and should be carefully planned through site-specific management options. |
| Key Words: aerobic soil conditions, fertilization, global warming potential, greenhouse gas, mitigation potential, watersaving |
| Citation: Lagomarsino, A., Agnelli, A. E., Linquist, B., Adviento-borbe, M. A., Agnelli, A., Gavina, G., Ravaglia, S. and Ferrara, R. M. 2016. Alternate wetting and drying of rice reduced CH4 emissions but triggered N2O peaks in a clayey soil of central Italy. Pedosphere. 26(4): 533-548. |
|
View Full Text
|
|
|
|
