Effect of post-harvest practices on greenhouse gas emissions in rice paddies: flooding regime and straw management
Aims To assess 1) the effect of the combination of flooding (winter flooding vs. non-winter flooding; WFL vs NWF) and timing of straw incorporation (early vs late straw incorporation; ESI vs LSI) in the post-harvest of paddy agrosystem, on a year-round global balance of greenhouse gases (GHG) exchanges, i.e. methane (CH4), carbon dioxide (CO2) and nitrous oxide (N2O); 2) the impact on the net ecosystem carbon balance (NECB) and 3) the resulting net global warming potential (GWP). Methods A field experiment was conducted with fortnightly samplings of main GHG emissions. Effect of the studied factors on GHG emissions was seasonally assessed. The net GWP is estimated from the balance between GHG (CH4 and N2O) and NECB. Results NWF-LSI reduced net GWP by 206% compared to conventional post-harvest management (WFL-ESI). NECB was similar in all treatments. Avoiding winter flooding reduced CH4 emissions significantly in the post-harvest and next growing seasons, while delay straw incorporation prevented CH4 and CO2 emissions during post-harvest. None of the treatments increased N2O emission. Environmental implications of post-harvest management options are discussed. Conclusions Post-harvest management affects net GWP of the paddy rice cultivation by modifying GHG emissions in post-harvest and next growing season without compromise sequestration C budget. The combination of non-winter flooding and late straw incorporation strategies were more effective in reducing both CH4 and CO2 emissions, due to avoiding higher temperatures at the time of the straw incorporation during post-harvest and increasing soil Eh conditions at the following growing season.
574 - Ecologia general i biodiversitat
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Plant and Soil
Belenguer-Manzanedo, María, Carles Alcaraz, Antonio Camacho, Carles Ibáñez, Mar Català-Forner, and Maite Martínez-Eixarch. 2022. "Effect Of Post-Harvest Practices On Greenhouse Gas Emissions In Rice Paddies: Flooding Regime And Straw Management". Plant And Soil. doi:10.1007/s11104-021-05234-y.
Grant agreement number
EC/LIFE/LIFE 13 ENV-ES-001182/EU/Adaptation and mitigation measures to climate change in the Ebro Delta/LIFE EBRO-ADMICLIM
MICINN/Programa Estatal de generación del conocimiento y fortalecimiento científico y tecnológico del sistema I+D+I y Programa Estatal de I+D+I orientada a los retos de la sociedad/PID2019-104742RB-I00/ES/FACTORES CLAVE Y EFECTOS DEL ESTADO DE CONSERVACION Y USOS SOBRE LOS BALANCES DE C Y LA MITIGACION DEL CAMBIO CLIMATICO EN HUMEDALES MEDITERRANEOS: APROXIMACION FUNCIONAL/CLIMAWET-CONS
INIA/Programa Estatal de I+D+I orientada a los retos de la sociedad/RTA2014-00058-C03-03/ES/Mitigación y adaptación al cambio climático en arrozales costeros: definición de buenas prácticas para reducir emisiones y valoración de variedades tolerantes a la salinidad/
Aigües Marines i Continentals
Cultius Extensius Sostenibles
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