Definition:
Appui et protection qu’apportent indirectement à une activité économique et à un bien les fonctions naturelles des zones humides tropicales, ou des services «environnementaux» réglementaires, comme la lutte contre les inondations.
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