Auteurs, date et publication :
Auteurs P. Choler
Publication : Biogeosciences
Date : 2015
Volume : 12
Issue : 12
Pages : 3885-3897
Catégorie(s)
#CNRS #Lautaret #UGAAuteurs, date et publication :
Auteurs Jérôme Chave , Stuart J Davies , Oliver L Phillips , Simon L Lewis , Plinio Sist , Dmitry Schepaschenko , John Armston , Tim R Baker , David Coomes , Mathias Disney
Publication : Surveys in Geophysics
Date : 2025
Volume : 40
Issue : 4
Pages : 863-880
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Plant phenology characterises the seasonal cyclicity of biological events such as budburst, flowering, fructification, leaf senescence and leaf fall. These biological events are genetically pre-determined but also strongly modulated by climatic conditions, particularly temperature, daylength and water availability. Therefore, the timing of these events is considered as a good indicator of climate change impacts and as a key parameter for understanding and modelling vegetation–climate interactions. In situ observations, empirical or bioclimatic models and remotely sensed time-series data constitute the three possible ways for monitoring the timing of plant phenological events. Remote sensing has the advantage of being the only way of surface sampling at high temporal frequency and, in the case of satellite-based remote sensing, over large regions. Nevertheless, exogenous factors, particularly atmospheric conditions, lead to some uncertainties on the seasonal course of surface reflectance and cause bias in the identification of vegetation phenological events. Since 2005, a network of forest and herbaceous sites has been equipped with laboratory made NDVI sensors to monitor the temporal dynamics of canopy structure and phenology at an intra-daily time step. In this study, we present recent results obtained in several contrasting biomes in France, French Guiana, Belgium and Congo. These sites represent a gradient of vegetation ecosystems: the main evergreen and deciduous forest ecosystems in temperate climate region, an evergreen tropical rain forest in French Guiana, an herbaceous savanna ecosystem in Congo, and a succession of three annual crops in Belgium. In this paper, (1) we provide an accurate description of the seasonal dynamics of vegetation cover in these different ecosystems (2) we identify the most relevant remotely sensed markers from NDVI time-series for determining the dates of the main phenological events that characterize these ecosystems and (3) we discuss the relationships between temporal canopy dynamics and climate factors. In addition to its importance for phenological studies, this ground-based Network of NDVI measurement provides data needed for the calibration and direct validation of satellite observations and products.
Auteurs, date et publication :
Auteurs K. Soudani , G. Hmimina , N. Delpierre , J.-Y. Pontailler , M. Aubinet , D. Bonal , B. Caquet , A. de Grandcourt , B. Burban , C. Flechard , D. Guyon , A. Granier , P. Gross , B. Heinesh , B. Longdoz , D. Loustau , C. Moureaux , J.-M. Ourcival , S. Rambal , L. Saint André
Publication : Remote Sensing of Environment
Date : 2012
Volume : 123
Pages : 234–245
Catégorie(s)
#CIRAD #CNRS #FORET Paracou #FORET PuechabonRésumé
Abstract. Plant transpiration links physiological responses of vegetation to water supply and demand with hydrological, energy, and carbon budgets at the land–atmosphere interface. However, despite being the main land evaporative flux at the global scale, transpiration and its response to environmental drivers are currently not well constrained by observations. Here we introduce the first global compilation of whole-plant transpiration data from sap flow measurements (SAPFLUXNET, https://sapfluxnet.creaf.cat/, last access: 8 June 2021). We harmonized and quality-controlled individual datasets supplied by contributors worldwide in a semi-automatic data workflow implemented in the R programming language. Datasets include sub-daily time series of sap flow and hydrometeorological drivers for one or more growing seasons, as well as metadata on the stand characteristics, plant attributes, and technical details of the measurements. SAPFLUXNET contains 202 globally distributed datasets with sap flow time series for 2714 plants, mostly trees, of 174 species. SAPFLUXNET has a broad bioclimatic coverage, with woodland/shrubland and temperate forest biomes especially well represented (80 % of the datasets). The measurements cover a wide variety of stand structural characteristics and plant sizes. The datasets encompass the period between 1995 and 2018, with 50 % of the datasets being at least 3 years long. Accompanying radiation and vapour pressure deficit data are available for most of the datasets, while on-site soil water content is available for 56 % of the datasets. Many datasets contain data for species that make up 90 % or more of the total stand basal area, allowing the estimation of stand transpiration in diverse ecological settings. SAPFLUXNET adds to existing plant trait datasets, ecosystem flux networks, and remote sensing products to help increase our understanding of plant water use, plant responses to drought, and ecohydrological processes. SAPFLUXNET version 0.1.5 is freely available from the Zenodo repository (https://doi.org/10.5281/zenodo.3971689; Poyatos et al., 2020a). The “sapfluxnetr” R package – designed to access, visualize, and process SAPFLUXNET data – is available from CRAN.
Auteurs, date et publication :
Auteurs Rafael Poyatos , Víctor Granda , Víctor Flo , Mark A. Adams , Balázs Adorján , David Aguadé , Marcos P. M. Aidar , Scott Allen , M. Susana Alvarado-Barrientos , Kristina J. Anderson-Teixeira , Luiza Maria Aparecido , M. Altaf Arain , Ismael Aranda , Heidi Asbjornsen , Robert Baxter , Eric Beamesderfer , Z. Carter Berry , Daniel Berveiller , Bethany Blakely , Johnny Boggs
Publication : Earth System Science Data
Date : 2021
Volume : 13
Issue : 6
Pages : 2607-2649
Catégorie(s)
#CNRS #FORET PuechabonAuteurs, date et publication :
Auteurs Jérôme Sueur , Amandine Gasc , Philippe Grandcolas , Sandrine Pavoine
Date : 2025
Pages : 99-117
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Benoît Sotton , Alain Paris , Séverine Le Manach , Alain Blond , Gérard Lacroix , Alexis Millot , Charlotte Duval , Qin Qiao , Arnaud Catherine , Benjamin Marie
Publication : Science of The Total Environment
Date : 2025
Volume : 590-591
Pages : 333-342
Catégorie(s)
#ANR-Citation #CNRS #ENS #PLANAQUAAuteurs, date et publication :
Auteurs Pierre-Henri Dalens , Frédéric Robin
Publication : Insecta Mundi
Date : 2025
Catégorie(s)
#⛔ No DOI found #CNRS #FORET NouraguesRésumé
Mediterranean shrublands are generally water-limited and fire-driven ecosystems. Seed-based post-fire regeneration may be affected by varying rainfall patterns, depending on species sensitivity to germinate under water stress. In our study, we considered the germination response to water stress in four species from several sites across the Mediterranean Basin. Seeds of species with a hard coat (Cistus monspeliensis, C. salviifolius, Cistaceae, Calicotome villosa, Fabaceae) or soft coat (Erica arborea, Ericaceae), which were exposed or not to a heat shock and smoke (fire cues), were made to germinate under water stress. Final germination percentage, germination speed and viability of seeds were recorded. Germination was modelled using hydrotime analysis and correlated to the water balance characteristics of seed provenance. Water stress was found to decrease final germination in the three hard-seeded species, as well as reduce germination speed. Moreover, an interaction between fire cues and water stress was found, whereby fire cues increased sensitivity to water stress. Seed viability after germination under water stress also declined in two hard-seeded species. Conversely, E. arborea showed little sensitivity to water stress, independent of fire cues. Germination responses varied among populations of all species, and hydrotime parameters were not correlated to site water balance, except in E. arborea when not exposed to fire cues. In conclusion, the species studied differed in germination sensitivity to water stress; furthermore, fire cues increased this sensitivity in the three hard-seeded species, but not in E. arborea. Moreover, populations within species consistently differed among themselves, but these differences could only be related to the provenance locality in E. arborea in seeds not exposed to fire cues.
Auteurs, date et publication :
Auteurs D. Chamorro , B. Luna , J.-M. Ourcival , A. Kavgacı , C. Sirca , F. Mouillot , M. Arianoutsou , J. M. Moreno , R. Bekker
Publication : Plant Biology
Date : 2025
Volume : 19
Issue : 1
Pages : 23-31
Catégorie(s)
#CNRS #FORET PuechabonAuteurs, date et publication :
Auteurs Hans J. De Boeck , Sara Vicca , Jacques Roy , Ivan Nijs , Alexandru Milcu , Juergen Kreyling , Anke Jentsch , Abad Chabbi , Matteo Campioli , Terry Callaghan , Carl Beierkuhnlein , Claus Beier
Publication : BioScience
Date : 2025
Volume : 65
Pages : 922–931
Catégorie(s)
#ACBB #ACBB Lusignan #CNRS #Ecotron de MontpellierRésumé
Abstract Plant populations can undergo very localized adaptation, allowing widely distributed populations to adapt to divergent habitats in spite of recurrent gene flow. Neotropical trees?whose large and undisturbed populations often span a variety of environmental conditions and local habitats?are particularly good models to study this process. Here, we explore patterns of adaptive divergence from large (i.e., regional) to small (i.e., microgeographic) spatial scales in the hyperdominant Amazonian tree Eperua falcata Aubl. (Fabaceae) under a replicated design involving two microhabitats (~300 m apart) in two study sites (~300 km apart). A three-year reciprocal transplant illustrates that, beyond strong maternal effects and phenotypic plasticity, genetically driven divergence in seedling growth and leaf traits was detected both between seedlings originating from different regions, and between seedlings from different microhabitats. In parallel, a complementary genome scan for selection was carried out through whole-genome sequencing of tree population pools. A set of 290 divergence outlier SNPs was detected at the regional scale (between study sites), while 185 SNPs located in the vicinity of 106 protein-coding genes were detected as replicated outliers between microhabitats within regions. Outlier-surrounding genomic regions are involved in a variety of physiological processes, including plant responses to stress (e.g., oxidative stress, hypoxia and metal toxicity) and biotic interactions. Together with evidence of microgeographic divergence in functional traits, the discovery of genomic candidates for microgeographic adaptive divergence represents a promising advance in our understanding of local adaptation, which probably operates across multiple spatial scales and underpins divergence and diversification in Neotropical trees.
Auteurs, date et publication :
Auteurs Louise Brousseau , Paul V. A. Fine , Erwin Dreyer , Giovanni G. Vendramin , Ivan Scotti
Publication : Molecular Ecology
Date : 2025
Volume : n/a
Issue : n/a