Definition:
Ensemble des processus inhérents aux divers composants biologiques, chimiques et physiques d’une zone humide, tels que le cycle des éléments nutritifs, la productivité biologique et l’alimentation d’une nappe souterraine.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
Edward B. Barbier, Mike Acreman, and Duncan Knowler, 1997, Economic Valuation of Wetlands: a Guide for Policy Makers and Planners, Ramsar