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Guilhen J., Al Bitar A., Sauvage S., Parrens M., Martinez Jean-Michel, Abril Gwenaël, Moreira Turcq Patricia, Sanchez-Perez J. M. (2020). Denitrification and associated nitrous oxide and carbon dioxide emissions from the Amazonian wetlands. Biogeosciences, 17 (16), 4297-4311. ISSN 1726-4170

Fichier PDF disponiblehttp://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-09/010079690.pdf[ PDF Link ]

Lien direct chez l'éditeur doi:10.5194/bg-17-4297-2020

Titre
Denitrification and associated nitrous oxide and carbon dioxide emissions from the Amazonian wetlands
Année de publication2020
Type de documentArticle référencé dans le Web of Science WOS:000566729400001
AuteursGuilhen J., Al Bitar A., Sauvage S., Parrens M., Martinez Jean-Michel, Abril Gwenaël, Moreira Turcq Patricia, Sanchez-Perez J. M.
SourceBiogeosciences, 2020, 17 (16), p. 4297-4311. ISSN 1726-4170
RésuméIn this paper, we quantify the CO2 and N2O emissions from denitrification over the Amazonian wetlands. The study concerns the entire Amazonian wetland ecosystem with a specific focus on three floodplain (FP) locations: the Branco FP, the Madeira FP and the FP alongside the Amazon River. We adapted a simple denitrification model to the case of tropical wetlands and forced it by open water surface extent products from the Soil Moisture and Ocean Salinity (SMOS) satellite. A priori model parameters were provided by in situ observations and gauging stations from the HYBAM Observatory. Our results show that the denitrification and the trace gas emissions present a strong cyclic pattern linked to the inundation processes that can be divided into three distinct phases: activation, stabilization and deactivation. We quantify the average yearly denitrification and associated emissions of CO2 and N2O over the entire watershed at 17.8 kgN ha(-1) yr(-1) , 0.37 gC-CO2 M(-2 )yr(-1) and 0.18 gN-N2O M-2 yr(-1) respectively for the period 2011-2015. When compared to local observations, it was found that the CO(2)emissions accounted for 0.01 % of the integrated ecosystem, which emphasizes the fact that minor changes to the land cover may induce strong impacts on the Amazonian carbon budget. Our results are consistent with the state of the art of global nitrogen models with a positive bias of 28 %.When compared to other wetlands in different pedoclimatic environments we found that the Amazonian wetlands have similar emissions of N2O with the Congo tropical wetlands and lower emissions than the temperate and tropical anthropogenic wetlands of the Garonne (France), the Rhine (Europe) and south-eastern Asia rice paddies. In summary our paper shows that a data-model-based approach can be successfully applied to quantify N2O and CO(2)fluxes associated with denitrification over the Amazon basin. In the future, the use of higher-resolution remote sensing products from sensor fusion or new sensors like the Surface Water and Ocean Topography (SWOT) mission will permit the transposition of the approach to other large-scale watersheds in tropical environments.
Plan de classementSciences du milieu [021] ; Ecologie, systèmes aquatiques [036] ; Etudes, transformation, conservation du milieu naturel [082] ; Télédétection [126] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.BOLIVIE ; COLOMBIE ; EQUATEUR ; GUYANE FRANCAISE ; PEROU ; SURINAME ; GUYANA ; BRESIL ; AMAZONE BASSIN
LocalisationFonds IRD [F B010079690]
Identifiant IRDfdi:010079690
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010079690

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