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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Recovering wetland biogeomorphic feedbacks to restore the world’s biotic carbon hotspots (2022)
Auteurs :	Ralph J. M. Temmink, Auteur ; Leon P. M. Lamers, Auteur ; Christine Angelini, Auteur ; Tjeerd J. Bouma, Auteur ; Christian Fritz, Auteur ; Johan van de Koppel, Auteur ; Robin Lexmond, Auteur ; Max Rietkerk, Auteur ; Brian R. Silliman, Auteur ; Hans Joosten, Auteur ; Tjisse van der Heide, Auteur
Type de document :	Article
Dans :	Science (376(6593) May, 2022)
Article en page(s) :	9
Résumé :	A key advancement in understanding wetland functioning has been the recognition of the role of reciprocal organism-landform interactions, “biogeomorphic feedbacks.” Biogeomorphic feedbacks entail self-reinforcing interactions between biota and geomorphology, by which organisms—often vegetation—engineer landforms to their own benefit following a positive density-dependent relationship. Vegetation that dominates major carbon-storing wetlands generate self-facilitating feedbacks that shape the landscape and amplify carbon sequestration and storage. As a result, per unit area, wetland carbon stocks and sequestration rates greatly exceed those of terrestrial forests and oceans, ecosystems that worldwide harbor large stocks because of their large areal extent. Worldwide biogeomorphic wetlands experience human-induced average annual loss rates of around 1%. The authors estimate that associated carbon losses amount to 0.5 Pg C per year, levels that are equivalent to 5% of the estimated overall anthropogenic carbon emissions. Because carbon emissions from degraded wetlands are often sustained for centuries until all organic matter has been decomposed, conserving and restoring biogeomorphic wetlands must be part of global climate solutions. The authors highlights that biogeomorphic wetlands serve as the world’s biotic carbon hotspots, and that conservation and restoration of these hotspots offer an attractive contribution to mitigate global warming. Recent scientific findings show that restoration methods aimed at reestablishing biogeomorphic feedbacks can greatly increase establishment success and restoration yields, paving the way for large-scale restoration actions. Therefore, they argue that implementing such measures can facilitate humanity in its pursuit of targets set by the Paris Agreement and the United Nations Decade on Ecosystem Restoration.
En ligne :	https://www.science.org/doi/10.1126/science.abn1479

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