P
Pierre Hiernaux
Researcher at Centre national de la recherche scientifique
Publications - 72
Citations - 5061
Pierre Hiernaux is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Vegetation & Environmental science. The author has an hindex of 29, co-authored 60 publications receiving 4313 citations. Previous affiliations of Pierre Hiernaux include University of Toulouse & Goddard Space Flight Center.
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Journal ArticleDOI
Determinants of woody cover in African savannas
Mahesh Sankaran,Niall P. Hanan,Robert J. Scholes,Jayashree Ratnam,David J. Augustine,Brian S. Cade,Jacques Gignoux,Steven I. Higgins,Xavier Le Roux,Fulco Ludwig,Jonas Ardö,Feetham Banyikwa,Andries Bronn,Gabriela Bucini,Kelly K. Caylor,Michael B. Coughenour,Alioune Diouf,Wellington N. Ekaya,Christie J. Feral,Edmund C. February,Peter G. H. Frost,Pierre Hiernaux,Halszka Hrabar,Kristine L. Metzger,Herbert H. T. Prins,Susan Ringrose,William B. Sea,Jörg Tews,Jeff Worden,Nick Zambatis +29 more
TL;DR: It is shown, using data from 854 sites across Africa, that maximum woody cover in savannas receiving a mean annual precipitation (MAP) of less than ∼650 mm is constrained by, and increases linearly with, MAP.
Journal ArticleDOI
Savanna Vegetation-Fire-Climate Relationships Differ Among Continents
Caroline E. R. Lehmann,Caroline E. R. Lehmann,T. Michael Anderson,Mahesh Sankaran,Mahesh Sankaran,Steven I. Higgins,Steven I. Higgins,Sally Archibald,Sally Archibald,William A. Hoffmann,Niall P. Hanan,Richard J. Williams,Roderick J. Fensham,Jeanine Maria Felfili,Lindsay B. Hutley,Jayashree Ratnam,José J. San José,R. Montes,Donald C. Franklin,Jeremy Russell-Smith,Casey M. Ryan,Giselda Durigan,Pierre Hiernaux,Ricardo Flores Haidar,David M. J. S. Bowman,William J. Bond +25 more
TL;DR: Using data from 2154 sites in savannas across Africa, Australia, and South America, it is found that increasing moisture availability drives increases in fire and tree basal area, whereas fire reduces tree basal Area.
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Re-Greening Sahel: 30 Years of Remote Sensing Data and Field Observations (Mali, Niger)
TL;DR: In this paper, a linear regression analysis performed between spatially averaged seasonal NDVI and a weighted average of field measurements explains 59% of the variability for the Gourma region over 1984-2011, and 38% for the Fakara region over 1994-2011.
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An unexpectedly large count of trees in the West African Sahara and Sahel
Martin Brandt,Compton J. Tucker,Ankit Kariryaa,Kjeld Rasmussen,Christin Abel,Jennifer Small,Jérôme Chave,Laura Vang Rasmussen,Pierre Hiernaux,Abdoul Aziz Diouf,Laurent Kergoat,Ole Mertz,Christian Igel,Fabian Gieseke,Johannes Schöning,Sizhuo Li,K. A. Melocik,Jesse Meyer,Scott Sinno,Eric Romero,Erin Glennie,Amandine Montagu,Morgane Dendoncker,Rasmus Fensholt +23 more
TL;DR: Deep learning was used to map the crown sizes of each tree in the West African Sahara, Sahel and sub-humid zone using submetre-resolution satellite imagery, revealing a relatively high density of trees in arid areas.
Journal ArticleDOI
The AMMA-CATCH Gourma observatory site in Mali: Relating climatic variations to changes in vegetation, surface hydrology, fluxes and natural resources
Eric Mougin,Pierre Hiernaux,Laurent Kergoat,Manuela Grippa,P. de Rosnay,F. Timouk,V. Le Dantec,Valérie Demarez,François Lavenu,Marc Arjounin,Thierry Lebel,Nogmana Soumaguel,Eric Ceschia,Bernard Mougenot,Frédéric Baup,Frédéric Frappart,Pierre-Louis Frison,Julie Gardelle,C. Gruhier,Lionel Jarlan,Sylvain Mangiarotti,B. Sanou,Y. Tracol,Françoise Guichard,V. Trichon,L. Diarra,A. Soumaré,M. Koite,Fadiala Dembélé,C. Lloyd,Niall P. Hanan,Claire Damesin,Claire Delon,Dominique Serça,Corinne Galy-Lacaux,Josiane Seghieri,Sylvia Becerra,H. Dia,Fabrice Gangneron,Pierre Mazzega +39 more
TL;DR: The Gourma site in Mali is one of the three instrumented meso-scale sites deployed in West-Africa as part of the African Monsoon Multi-disciplinary Analysis (AMMA) project as discussed by the authors.