More than one quarter of Africa's tree cover is found outside areas previously classified as forest

Reiner Florian, Brandt Martin, Tong Xiaoye, Skole David, Kariryaa Ankit, Ciais Philippe, Davies Andrew, Hiernaux Pierre, Chave Jérôme, Mugabowindekwe Maurice, Igel Christian, Oehmcke Stefan, Gieseke Fabian, Li Sizhuo, Liu Siyu, Saatchi Sassan, Boucher Peter, Singh Jenia, Taugourdeau Simon, Dendoncker Morgane, Song Xiao-Peng, Mertz Ole, Tucker Compton J., Fensholt Rasmus. 2023. More than one quarter of Africa's tree cover is found outside areas previously classified as forest. Nature Communications, 14:2258, 10 p.

https://doi.org/10.1038/s41467-023-37880-4

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.7764460 / Url - jeu de données - Entrepôt autre : https://www.planet.com/nicfi / Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.5571936 / Url - jeu de données - Entrepôt autre : https://share.phys.ethz.ch/~pf/nlangdata/ETH_GlobalCanopyHeight_10m_2020_version1/ / Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.3978185

Résumé : The consistent monitoring of trees both inside and outside of forests is key to sustainable land management. Current monitoring systems either ignore trees outside forests or are too expensive to be applied consistently across countries on a repeated basis. Here we use the PlanetScope nanosatellite constellation, which delivers global very high-resolution daily imagery, to map both forest and non-forest tree cover for continental Africa using images from a single year. Our prototype map of 2019 (RMSE = 9.57%, bias = −6.9%). demonstrates that a precise assessment of all tree-based ecosystems is possible at continental scale, and reveals that 29% of tree cover is found outside areas previously classified as tree cover in state-of-the-art maps, such as in croplands and grassland. Such accurate mapping of tree cover down to the level of individual trees and consistent among countries has the potential to redefine land use impacts in non-forest landscapes, move beyond the need for forest definitions, and build the basis for natural climate solutions and tree-related studies.

Mots-clés Agrovoc : forêt tropicale, couverture végétale, agroforesterie, imagerie par satellite, couvert forestier, cartographie de l'occupation du sol, cartographie de l'utilisation des terres, couvert, aménagement forestier, télédétection, dégradation des forêts, déboisement

Mots-clés géographiques Agrovoc : Sénégal, Mozambique

Mots-clés libres : Tree cover, Africa

Classification Agris : P01 - Conservation de la nature et ressources foncières
U30 - Méthodes de recherche
K01 - Foresterie - Considérations générales

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Agences de financement européennes : European Research Council

Agences de financement hors UE : Agence Nationale de la Recherche, Villum Fonden

Programme de financement européen : H2020

Projets sur financement : (EU) Trees outside forests in global drylands, (FRA) CEnter of the study of Biodiversity in Amazonia, (FRA) Towards a Unified theory of biotic Interactions: the roLe of environmental

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