Résumé
Predicting regional and global carbon (C) and water dynamics on grasslands has become of major interest, as grasslands are one of the most widespread vegetation types worldwide, providing a number of ecosystem services (such as forage production and C storage). The present study is a contribution to a regional-scale analysis of the C and water cycles on managed grasslands. The mechanistic biogeochemical model PaSim (Pasture Simulation model) was evaluated at 12 grassland sites in Europe. A new parameterization was obtained on a common set of eco-physiological parameters, which represented an improvement of previous parameterization schemes (essentially obtained via calibration at specific sites). We found that C and water fluxes estimated with the parameter set are in good agreement with observations. The model with the new parameters estimated that European grassland are a sink of C with 213 g C m−2 yr−1, which is close to the observed net ecosystem exchange (NEE) flux of the studied sites (185 g C m−2 yr−1 on average). The estimated yearly average gross primary productivity (GPP) and ecosystem respiration (RECO) for all of the study sites are 1220 and 1006 g C m−2 yr−1, respectively, in agreement with observed average GPP (1230 g C m−2 yr−1) and RECO (1046 g C m−2 yr−1). For both variables aggregated on a weekly basis, the root mean square error (RMSE) was ∼5–16 g C week−1 across the study sites, while the goodness of fit (R2) was ∼0.4–0.9. For evapotranspiration (ET), the average value of simulated ET (415 mm yr−1) for all sites and years is close to the average value of the observed ET (451 mm yr−1) by flux towers (on a weekly basis, RMSE∼2–8 mm week−1; R2 = 0.3–0.9). However, further model development is needed to better represent soil water dynamics under dry conditions and soil temperature in winter. A quantification of the uncertainties introduced by spatially generalized parameter values in C and water exchange estimates is also necessary. In addition, some uncertainties in the input management data call for the need to improve the quality of the observational system.
Auteurs, date et publication :
Auteurs Shaoxiu Ma , Romain Lardy , Anne-Isabelle Graux , Haythem Ben Touhami , Katja Klumpp , Raphaël Martin , Gianni Bellocchi
Publication : Environmental Modelling & Software
Date : 2015
Volume : 72
Pages : 356-371
Catégorie(s)
#ACBB #ACBB Theix #INRAEAuteurs, date et publication :
Auteurs Lise Thouvenot , Jacques Haury , Gaétan Pottier , Gabrielle Thiébaut
Publication : Aquatic Botany
Date : 2017
Volume : 139
Pages : 1-7
Catégorie(s)
#INRAE #PEARLRésumé
Abstract Environmental microbial communities are now widely studied using metabarcoding approaches, thanks to the democratization of high-throughput DNA sequencing technologies. The massive number of reads produced with these technologies requires bioinformatic solutions to be treated. A key step in the analysis is to cluster reads into Operational Taxonomic Units (or OTUs) and thus reduce the amount of data for downstream analyses. Due to the important impact of the clustering method on the quantity and quality of OTUs, finding an equilibrium between the reliability and time-consuming nature of the chosen strategy is a real challenge. The present article proposes a new post-clustering tool called ReClustOR aimed at improving the stability and reliability of OTUs whatever the initial clustering method. We compared several clustering methods: a homemade de novo method, VSEARCH, Swarm and ReClustOR associated with these three clustering methods, and the ESV definition, using two datasets (a simulated one and an environmental one). All methods were analysed for their ability to efficiently describe microbial diversity in terms of alpha-diversity, beta-diversity and phylogeny. Dataset analysis showed that post-clustering with ReClustOR improved OTU detection not only in terms of diversity, but also in terms of reliability and stability as compared to the initial clustering methods. More precisely, the post-clustering step improved the congruence of the results (alpha-diversity, beta-diversity, composition) whatever the initial clustering method. Moreover, ReClustOR, by defining a database of centroids, precludes the need to re-cluster all the reads each time when new reads are generated. ReClustOR is a new post-clustering method that overcomes problems (OTU stability and reliability) associated with classical clustering methods and thereby increases the quality and the congruence of the reconstructed OTUs. Moreover, the OTU database defined with ReClustOR can be used as a reference gradually enriched by merging new studies and samples. In this way, huge datasets (e.g. the Earth Microbiome Project or the Tara Oceans project) can be used as references for other projects within their range of application, and increase the quality of comparisons among studies and datasets.
Auteurs, date et publication :
Auteurs Sébastien Terrat , Christophe Djemiel , Corentin Journay , Battle Karimi , Samuel Dequiedt , Walid Horrigue , Pierre-Alain Maron , Nicolas Chemidlin Prévost-Bouré , Lionel Ranjard
Publication : Methods in Ecology and Evolution
Date : 2020
Volume : 11
Issue : 1
Pages : 168-180
Catégorie(s)
#ANR-Citation #Genosol #INRAEAuteurs, date et publication :
Auteurs Stéphane Pesce , Benoit JD Ferrari , Chloé Bonnineau , Carmen Casado , Laure APOTHELOZ-PERRET-GENTIL , Agnès Bouchez , Nathalie Cheviron , Marina Coquery , Aymeric Dabrin , Silwan Daouk , Luiz Felippe de Alencastro , Davide Degli-Esposti , Nathalie Dubois , Émilie Egea , Élise Folly , Arnaud Foulquier , David Gateuille , Véronique Gouy , Michel Lafont , Mélanie Laluc
Publication : Sciences Eaux & Territoires
Date : 2025
Pages : 9
Catégorie(s)
#BiochemEnv #INRAEAuteurs, date et publication :
Auteurs Quentin Rougemont , Camille Roux , Samuel Neuenschwander , Jerome Goudet , Sophie Launey , Guillaume Evanno
Publication : PeerJ
Date : 2016
Volume : 4
Pages : e1910
Catégorie(s)
#INRAE #PEARLAuteurs, date et publication :
Auteurs Yves Thiry , Taku Tanaka , Maïté Bueno , Paulina Pisarek , Marine Roulier , Hervé Gallard , Arnaud Legout , Manuel Nicolas
Publication : Science of The Total Environment
Date : 2025
Volume : 831
Pages : 154901
Catégorie(s)
#FORET Breuil #INRAERésumé
1. According to the dynamic equilibrium hypothesis (DEH), plant species richness is locally controlled by productivity and disturbance. Given that regional conditions widely affect local environmental variables such as soil nutrient availability, the DEH predictions could be improved by considering how climate influences local controls of species richness. Further, a trait-based approach to community assembly has the potential to reveal a deeper, mechanistic understanding of species richness variation across environments. Here, we bring together DEH and trait-based community assembly expectations to examine whether and how local relationships between diversity, disturbance and productivity are affected by habitat filtering and regional climate.
Auteurs, date et publication :
Auteurs Jessy Loranger , Cyrille Violle , Bill Shipley , Sandra Lavorel , Anne Bonis , Pablo Cruz , Frédérique Louault , Grégory Loucougaray , François Mesléard , Nicole Yavercovski , Éric Garnier , Frida Piper
Publication : Journal of Ecology
Date : 2025
Volume : 104
Issue : 3
Pages : 781-791
Catégorie(s)
#ACBB #ACBB Theix #INRAEAuteurs, date et publication :
Auteurs Benjamin Pauget , Frédéric Gimbert , Michaël Coeurdassier , Nadia Crini , Guénola Pérès , Olivier Faure , Francis Douay , Adnane Hitmi , Thierry Beguiristain , Aude Alaphilippe , Murielle Guernion , Sabine Houot , Marc Legras , Jean-François Vian , Mickaël Hedde , Antonio Bispo , Cécile Grand , Annette de Vaufleury
Publication : Ecological Indicators
Date : 2025
Volume : 29
Pages : 445-454
Catégorie(s)
#INRAE #PRO #PRO Colmar #PRO QualiAgroRésumé
Comparing root functioning under contrasting rainfall regimes can help assessing the capacity of plant species to cope with more intense and frequent drought predicted under climate change context. While the awareness of the need to study the whole root system is growing, most of the studies of root functioning through rhizosphere analyses have been restricted to the topsoil. Our study aimed to assess whether the depth in the soil and the rainfall amount affect root functioning, and notably the fate of nutrients within the rhizosphere.
Auteurs, date et publication :
Auteurs Céline Pradier , Philippe Hinsinger , Jean-Paul Laclau , Jean-Pierre Bouillet , Irae Amaral Guerrini , José Leonardo Moraes Gonçalves , Verónica Asensio , Cassio H. Abreu-Junior , Christophe Jourdan
Publication : Plant and Soil
Date : 2025
Volume : 414
Issue : 1
Pages : 339-354
Catégorie(s)
#CIRAD #FORET Itatinga #INRAERésumé
Dans ce numéro, découvrez le dossier thématique "Ancienneté, maturité, naturalité : biodiversité des forêts" ainsi que des articles de recherche, développement et innovation, sur la gestion durable des forêts publiques par l'Office national des forêts (ONF) et ses partenaires.
Auteurs, date et publication :
Auteurs N. Korboulewsky , P. Balandier , Y. Dumas , M. Gosselin , A. Marell , T. Perot
Publication : Rendez-vous Techniques ONF
Date : 2021
Pages : 51-57