Effects of water management and cultivar on carbon dynamics, plant productivity and biomass allocation in European rice systems

Oliver Viktoria, Cochrane Nicole, Magnusson Julia, Brachi Erika, Monaco Stefano, Volante Andrea, Courtois Brigitte, Valè Giampiero, Price Adam H., Teh Yit Arn. 2019. Effects of water management and cultivar on carbon dynamics, plant productivity and biomass allocation in European rice systems. Science of the Total Environment, 685 : pp. 1139-1151.

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Abstract : Water saving techniques, such as alternate wetting and drying (AWD), are becoming a necessity in modern rice farming because of climate change mitigation and growing water use scarcity. Reducing water can vastly reduce methane (CH4) emissions; however, this net climate benefit may be offset by enhanced carbon dioxide (CO2) emissions from soil. The main aims of this study were: to determine the effects of AWD on yield and ecosystem C dynamics, and to establish the underlying mechanistic basis for observed trends in net ecosystem C gain or loss in an Italian rice paddy. We investigated the effects of conventional water management (i.e. conventionally flooded paddy; CF) and AWD on biomass accumulation (aboveground, belowground, grain), key ecosystem C fluxes (net ecosystem exchange (NEE), net primary productivity (NPP), gross primary productivity (GPP), ecosystem respiration (ER), autotrophic respiration (RA), heterotrophic respiration (RH)), and soil organic matter (SOM) decay for four common commercial European rice cultivars. The most significant finding was that neither treatment nor cultivar affected NEE, GPP, ER or SOM decomposition. RA was the dominant contributor to ER for both CF and AWD treatments. Cultivar and treatment affected the total biomass of the rice plants; specifically, with greater root production in CF compared to AWD. Importantly, there was no effect of treatment on the overall yield for any cultivar. Possibly, the wetting-drying cycles may have been insufficient to allow substantial soil C metabolism or there was a lack of labile substrate in the soil. These results imply that AWD systems may not be at risk of enhancing soil C loss, making it a viable solution for climate change mitigation and water conservation. Although more studies are needed, the initial outlook for AWD in Europe is positive; with no net loss of soil C from SOM decomposition, whilst also maintaining yield.

Mots-clés Agrovoc : Oryza, Besoin en eau, réduction des émissions, Cycle du carbone, Stress dû à la sécheresse, Ressource en eau, adaptation aux changements climatiques, Cycle hydrologique

Mots-clés géographiques Agrovoc : France, Espagne

Classification Agris : F08 - Cropping patterns and systems
F06 - Irrigation
P10 - Water resources and management
P40 - Meteorology and climatology
P33 - Soil chemistry and physics

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

  • Oliver Viktoria, University of Aberdeen (GBR) - auteur correspondant
  • Cochrane Nicole, University of Aberdeen (GBR)
  • Magnusson Julia, University of Aberdeen (GBR)
  • Brachi Erika, Universita di Torino (ITA)
  • Monaco Stefano, CREA (ITA)
  • Volante Andrea, CREA (ITA)
  • Courtois Brigitte, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0003-2118-7102
  • Valè Giampiero, CREA (ITA)
  • Price Adam H., University of Aberdeen (GBR)
  • Teh Yit Arn, University of Aberdeen (GBR)

Source : Cirad-Agritrop (

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