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Taillardat P., Willemsen P., Marchand Cyril, Friess D. A., Widory D., Baudron P., Truong V. V., Nguyen T. N., Ziegler A. D. (2018). Assessing the contribution of porewater discharge in carbon export and CO2 evasion in a mangrove tidal creek (Can Gio, Vietnam). Journal of Hydrology, 563, 303-318. ISSN 0022-1694

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Lien direct chez l'éditeur doi:10.1016/j.jhydrol.2018.05.042

Titre
Assessing the contribution of porewater discharge in carbon export and CO2 evasion in a mangrove tidal creek (Can Gio, Vietnam)
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000441492700025
AuteursTaillardat P., Willemsen P., Marchand Cyril, Friess D. A., Widory D., Baudron P., Truong V. V., Nguyen T. N., Ziegler A. D.
SourceJournal of Hydrology, 2018, 563, p. 303-318. ISSN 0022-1694
RésuméAlthough mangrove forests are efficient natural carbon sinks, most of the atmospheric carbon dioxide (CO2) fixed by its vegetation is believed to be exported via tidal exchange, rather than stored in the vegetative biomass and sediment. However, the magnitude of tidal export is largely unknown because direct measurements are scarce. We deployed a novel experimental design that combined automated high-resolution measurements of hydrodynamic, hydrogeochemical and biogeochemical parameters during the dry season in a mangrove tidal creek in the Can Gio Mangrove Forest in Vietnam. The objective was to quantify the tide-controlled water, porewater, DIC and DOC exchange, and estimate the CO2 evasion throughout tidal cycles contrasted by amplitude. Data from three 25-h time series showed a dear peak of DIC, DOC, pCO(2), and Rn-222 at low tide, particularly during tidal cycles of large amplitude, which directly relate to porewater discharge. Our mass balance models revealed that the tidal creek was a net exporter of dissolved carbon to coastal waters, with an important contribution (38%) coming from DIC in porewater discharge. Porewater exchange varied from 3.1 +/- 1.6 to 7.1 +/- 2.4 cm day(-1). DIC exchange ranged from 352 +/- 34 to 678 +/- 79 mmoIC m(-2) day(-1); DOC exchange, 20.6 +/- 1.9 to 67.7 +/- 7.9 mmol C m(-2) day(-1); and CO2 evasion, 69.9 +/- 10.5 to 173.7 +/- 26.1 mmoIC m(-2) day(-1). These estimates were in the high range of previous carbon assessments and were explained by (i) the monitoring station being located at equal distance from the head and the mouth of the creek, which minimized carbon degradation and losses associated to transport in water; and (ii) the site being a highly productive mangrove within South East Asia.
Plan de classementHydrologie [062] ; Etudes, transformation, conservation du milieu naturel [082] ; Géologie et formations superficielles [064]
Descr. géo.VIET NAM ; CAN GIO
LocalisationFonds IRD [F B010073766]
Identifiant IRDfdi:010073766
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010073766

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