BRANDT, Martin; WIGNERON, Jean-Pierre; CHAVE, Jérôme; TAGESSON, Torbern; PEÑUELAS, Josep; CIAIS, Philippe; RASMUSSEN, Kjeld; TIAN, Feng; MBOW, Cheikh; AL-YAARI, Amen; RODRIGUEZ‐FERNANDEZ, Nemesio; SCHURGERS, Guy; ZHANG, Wenmin; CHANG, Jinfeng; KERR, Yann H.; VERGER, Aleixandre; TUCKER, Compton; MIALON, Arnaud; VANG RASMUSSEN, Laura; FAN, Lei; FENSHOLT, Rasmus

doi:10.1038/s41559-018-0530-6

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BRANDT, Martin
Department of Geosciences and Natural Resource Management [Copenhagen] [IGN]

WIGNERON, Jean-Pierre
Interactions Sol Plante Atmosphère [UMR ISPA]

CHAVE, Jérôme
Evolution et Diversité Biologique [EDB]

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Ce document a été publié dans

Nature Ecology & Evolution. 2018-05, vol. 2, n° 5, p. 827 - 835

Nature

Résumé en anglais

The African continent is facing one of the driest periods in the past three decades as well as continued deforestation. These disturbances threaten vegetation carbon (C) stocks and highlight the need for improved capabilities of monitoring large-scale aboveground carbon stock dynamics. Here we use a satellite dataset based on vegetation optical depth derived from low-frequency passive microwaves (L-VOD) to quantify annual aboveground biomass-carbon changes in sub-Saharan Africa between 2010 and 2016. L-VOD is shown not to saturate over densely vegetated areas. The overall net change in drylands (53% of the land area) was −0.05 petagrams of C per year (Pg C yr$^{−1}$) associated with drying trends, and a net change of −0.02 Pg C yr$^{−1}$ was observed in humid areas. These trends reflect a high inter-annual variability with a very dry year in 2015 (net change, −0.69 Pg C) with about half of the gross losses occurring in drylands. This study demonstrates, first, the applicability of L-VOD to monitor the dynamics of carbon loss and gain due to weather variations, and second, the importance of the highly dynamic and vulnerable carbon pool of dryland savannahs for the global carbon balance, despite the relatively low carbon stock per unit area.< Réduire

URI

https://oskar-bordeaux.fr/handle/20.500.12278/195182

DOI

http://dx.doi.org/10.1038/s41559-018-0530-6

Projet Européen

Effects of phosphorus limitations on Life, Earth system and Society

Project ANR

CEnter of the study of Biodiversity in Amazonia
Towards a Unified theory of biotic Interactions: the roLe of environmental

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Unités de recherche

Interactions Soil Plant Atmosphere (ISPA) - UMR 1391