The ability of marshes and forested wetlands to provide environmental services (water retention in soil and carbon storage) was evaluated at three locations along the coast of Veracruz, Mexico. Hydro-periods were obtained for the different vegetation communities of marshes and forested wetlands. Total organic carbon contents were 26.2% in Pachira swamp, 23.1% in Ficus swamp and 11.2% in marsh soils. The largest values of hydraulically active pore space were observed for marshes (0.79 cm 3 cm -3 ), and the lowest in forested wetlands (0.57 cm 3 cm -3 ). Soil water holding capacity ranged from 556 to 834 L m -2 for swamp areas and from 687 to 880 L m -2 for marshes. The thickness of soil organic layers in the wetland studied had a major control on soil water storage. This suggests that a vast amount of rain water could be retained in the soil. The results indicate that both swamps and marshes play important roles in their capacities to retain water and sequester carbon, although there were no significant differences among them.Key words environmental services; freshwater wetlands; Ficus; hydro-periods; organic soils; Pachira aquatica; swamp; water storage capacity; Mexico
RĂ©tention de l'eau des sols et pools de carbone dans les rĂ©gions tropicales humides boisĂ©es et les marais du Golfe du MexiqueRĂ©sumĂ© La capacitĂ© des marais et zones humides boisĂ©es Ă fournir des services environnementaux (rĂ©tention d'eau dans le sol et stockage du carbone) a Ă©tĂ© Ă©valuĂ©e pour trois sites de la cĂŽte de Veracruz, au Mexique. Des hydro-pĂ©riodes ont Ă©tĂ© obtenues pour les diffĂ©rentes communautĂ©s vĂ©gĂ©tales des marais et des zones humides boisĂ©es. Les teneurs en carbone organique total ont Ă©tĂ© de 26,2% dans le marais Pachira and Ficus are swamps, thus forested wetlands. I believe they are in french "humid boisĂ©es" Pachira, 23, 1% dans les marais Ficus et 11.2% dans les sols de marais. Les plus grandes valeurs de l'espace poreux hydrauliquement actif ont Ă©tĂ© observĂ©es pour les marais (0.79 cm 3 cm -3 ), et les plus faibles dans les zones humides boisĂ©es (0.57 cm 3 cm -3 ). La capacitĂ© de rĂ©tention en eau du sol varie de 556 Ă 834 L m -2 pour les zones marĂ©cageuses et de 687 Ă 880 L m -2 pour les marais. L'Ă©paisseur des couches de sol organique dans les zones humides Ă©tudiĂ©es exerçe un contrĂŽle majeur sur le stockage en eau du sol. Ceci suggĂšre qu'une grande quantitĂ© d'eau de pluie pourrait ĂȘtre retenue dans le sol. Les rĂ©sultats indiquent que les marĂ©cages et les marais jouent un rĂŽle important dans leur capacitĂ© Ă retenir l'eau et Ă piĂ©ger le carbone, bien qu'il n'y ait aucune diffĂ©rence significative parmi eux.