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Effect of post-harvest season on the methane emissions in rice paddy fields in the Ebre Delta

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imagen viñas1   Rice paddy fields are one of the major sources of greenhouse gas (GHG) emissions. The project LIFE EBRO-ADMICLIM is evaluating the annual pattern of greenhouse emissions in rice paddy fields at the Ebro Delta.

   A monthly monitoring of the GHG emission rates in 15 rice fields covering the whole geophysical variability of the Ebro Delta under standard agronomic management was carried out, including both growth and post-harvest (fallow). In addition, hydrological and physico-chemical parameters of the soil and the vegetation cover were also studied.

M. Viñas1, F.X. Prenafeta-Boldú1, J. Noguerol1, C. Alcaraz2, X. Aranda3, J.A. Saldaña-De la Vega2, M. Martínez-Eixarch2, C. Ibáñez2

1 IRTA Institute of Agrifood Research and Technology, GIRO. 08140 Caldes de Montbui. Spain
2 IRTA Institute of Agrifood Research and Technology, Aquatic Ecosystems. 43540 Sant Carles de la Ràpita, Spain.
3 IRTA Institute of Agrifood Research and Technology, Environmental Horticulture. 08140 Caldes de Montbui, Spain.
E-mail: . Tf: +34 902 789 449 ext. 1337

   Competing interests: The author has declared that no competing interests exist.

   Academic editor: Carlos N Díaz.

   Content quality: This paper has been peer reviewed by at least two reviewers. See scientific committee here

   Citation: M. Viñas, F.X. Prenafeta-Boldú, J. Noguerol, C. Alcaraz, X. Aranda, J.A. Saldaña-De la Vega, M. Martínez-Eixarch and C. Ibáñez, 2017, Effect of post-harvest season on the methane emissions in rice paddy fields in the Ebre Delta, IV International Conference of Odours and VOCs in the Environment, Valladolid, Spain, www.olores.org.

   Copyright: 2017 olores.org. Open Content Creative Commons license. It is allowed to download, reuse, reprint, modify, distribute, and/or copy articles in olores.org website, as long as the original authors and source are cited. No permission is required from the authors or the publishers.

   ISBN: 978-84-697-7359-8

   Keyword: climate change, emission factors, sustainable agriculture, wetlands, methane, nitrous oxide

 

Abstract

   Rice paddy fields are one of the major sources of greenhouse gas (GHG) emissions. The project LIFE EBRO-ADMICLIM is evaluating the annual pattern of greenhouse emissions in rice paddy fields at the Ebro Delta. A

   monthly monitoring of the GHG emission rates in 15 rice fields covering the whole geophysical variability of the Ebro Delta under standard agronomic management was carried out, including both growth and post-harvest (fallow). In addition, hydrological and physico-chemical parameters of the soil and the vegetation cover were also studied.

  CH4 emissions displayed a bimodal pattern, with peaks in July-August (growth) and in October (post-harvest). The emission rates ranged from 2.1±0.5 to 7.5±1.4 mg C-CH4 m-2 h-1 in the growing season (May to September), and 25.0±5, 7 to 20.1±3.3 mg C-CH4 m-2 h-1 to Post-harvest (October to December). In total, 314 kg of C-CH4 ha-1 year-1 were emitted, of which 70% were generated during the post-harvest season. The results revealed that both the incorporation of rice straw into the soil, and the water management at the end of the harvest were the main factors contributing to the annual GHG emission in rice paddy fields. In order to avoid underestimating CH4 emissions in rice fields, we suggest the inclusion of the fallow season for this crop in GHG annual inventories.

 

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