UMR Silva

UMR Silva

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L’UMR Silva rassemble des agents d’AgroParisTech, de l’INRAE, et de l’Université de Lorraine afin de mener des travaux de recherche pluridisciplinaires sur le bois, les arbres et les écosystèmes forestiers. Elle est issue de la fusion en janvier 2018 des Unités Mixtes de Recherche « Écologie et Écophysiologie Forestières » [EEF] et « Laboratoire d’Étude des Ressources Forêt Bois » [LERFoB]. Elle a pour objectifs de développer des travaux de recherche fondamentale et finalisée, afin de répondre aux interrogations de la société, et en particulier des gestionnaires forestiers, sur l’adaptation des écosystèmes forestiers aux changements globaux et sur les services que ceux-ci fournissent comme la production de bois ou leur contribution à l’atténuation du changement climatique.

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Liste des actualités

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image offre de thèse
article

07 avril 2026

Rédaction : Corinne Martin

Offre de thèse Vulnérabilité physiologique des espèces forestières

Vulnérabilité physiologique des espèces forestières feuillues face à des aléas combinés de sécheresse et d’insectes
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image offre de thèse
article

31 mars 2026

Rédaction : Corinne Martin

Offre de thèse en écologie forestière

Projet DIFOREST – Diversité fonctionnelle des peuplements forestiers et résistance face aux sécheresses. L’unité mixte de recherche UMR Silva propose une thèse de doctorat portant sur l’étude des mécanismes de résistance et de résilience des écosystèmes forestiers face aux sécheresses, dans un contexte de changement climatique.
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journées pédagogiques de la formation FIRS

Retour sur les journées pédagogiques FIRS à Nancy

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Les 16 et 17 mars 2026, le campus de AgroParisTech à Nancy a accueilli les journées pédagogiques de la formation « Forest Information and Resource Strategies » (FIRS).

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Technicien en expérimentation végétale

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Nous vous informons de l’ouverture des concours interne et externe pour le recrutement de techniciens de formation et de recherche (TFR) de classe normale, relevant du ministre chargé de l’agriculture, au titre de l’année 2026.

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Retour sur la Journée des doctorants / post-doctorants de l’UMR Silva

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Le 29 janvier 2026, la Faculté des Sciences et Technologies de Vandœuvre-lès-Nancy a accueilli la Journée des doctorants et post-doctorants de l’UMR Silva, un rendez-vous attendu qui met à l’honneur la richesse et la diversité des travaux de recherche menés au sein de l’unité.

 

HAL : Dernières publications

  • [hal-05578664] Lower prevalence of Lyme disease pathogens in mixed deciduous – coniferous forests

    A growing number of studies demonstrate the consequences of biodiversity loss on the increased prevalence of vector-borne diseases such as Lyme borreliosis. Given that vertebrate host species differ in their competence for pathogen transmission, it has been hypothesized that greater host diversity, which is more likely to occur in mixed forests, would reduce pathogen prevalence in ticks through a dilution effect. However, empirical evidence remains mixed, particularly in Europe, and recent studies suggest that habitat characteristics and vegetation structure may also play a key role in the risk of tick-borne disease. We sampled ticks along gradients of forest compositional diversity in a network of seven sites in Europe to assess the combined effect of tree and understorey plant diversity on ticks and associated pathogens. We found that several forest habitat characteristics were associated with variations in Ixodes ricinus densities and infection rates. The proportion of I. ricinus nymphs infected by Borrelia was lower in mixed than in pure forests. The prevalence of Borrelia and Rickettsia respectively increased and decreased with the richness of understorey plants. Ixodes ricinus larvae density increased with the proportion of plants palatable to roe deer (Capreolus capreolus). Our results suggest that forest diversity, at both tree and understorey levels, influences ticks and associated pathogens through several direct and potential indirect mechanisms such as effects on vertebrate hosts, particularly herbivores. Habitat and resource diversification of vertebrate hosts provides a useful theoretical framework to guide forest management toward reducing human health risks.

    ano.nymous@ccsd.cnrs.fr.invalid (Audrey Bourdin) 03 Apr 2026

    https://hal.inrae.fr/hal-05578664v1
  • [hal-05550584] Continental Contrasts in Climate Extremes That Control Tree Fecundity

    In 2023, more than half of olive harvests ( Olea europaea ) across Spain, Greece, and Türkiye were lost to drought. The same year late freeze destroyed 90% of the peach crop ( Prunus persica ) on the Georgia Piedmont and the apple crop ( Malus domestica ) in central New York, Vermont, and southern Quebec. Climate extremes now rank with the costliest threats to agriculture, but their role in forest recovery from diebacks that are happening globally is unknown for lack of tree fecundity estimates in forests. Tolerance of climate extremes could depend on past exposure but constrained by phylogenetic conservatism. We report a continental scale analysis of climate extremes and forest fecundity across North America and Europe showing that responses to late freeze and drought are happening now. Species differences are not explained by the traits typically included in ecological studies and they are weakly associated with phylogeny. Late freeze, that is, freezing temperatures that follow the onset of flower development in spring, is shown to be “normal” in North America, but not Europe, potentially explaining failed seed production due to delayed onset and the resultant shorter growing period by North American transplants dating back at least to the 18th century. Drought has thus far had the greatest impacts in dry forested regions, but here too, species differences are not explained by traditional trait values. If responses have been buffered from drought and late freeze by past exposure, acclimation and local adaptation prove inadequate as extremes intensify.

    ano.nymous@ccsd.cnrs.fr.invalid (James S Clark) 13 Mar 2026

    https://hal.science/hal-05550584v1
  • [hal-05574299] Amazon rainforests are rejuvenating their canopies by producing more photosynthetically efficient young leaves under climate change

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    ano.nymous@ccsd.cnrs.fr.invalid (Xueqin Yang) 31 Mar 2026

    https://hal.science/hal-05574299v1
  • [hal-05448009] Trait-dependent declines of threatened endemic trees following plant invasion on a tropical oceanic island

    Biological invasions are a leading cause of the ongoing biodiversity crisis, and particularly so on islands. However, the role of invasive alien plants (IAPs) as a driver of native plant declines and extinctions remains unclear. The inherently slow and gradual nature of plant extinctions, especially that of long-lived woody species, could be a reason. Here, we examined temporal trends in subpopulations of 28 threatened endemic tree (TET) taxa. We questioned the frequency with which they decline in association with IAPs on Reunion Island (South-West Indian Ocean), and asked whether the most susceptible TET taxa exhibit characteristics that could reveal the underlying ecological mechanisms. We resurveyed 182 historically described subpopulations and tested whether observed trends of juvenile and adult TETs correlate with the abundance in IAPs using path analyses, while distinguishing TET taxa with respect to their leaf–height–seed characteristics and extinction risk. The trend of adult TETs was not affected by IAPs but that of juvenile TETs was negatively correlated with the abundance of IAPs in the understory layer. This was particularly the case for TET taxa with conservative resource-use strategies (low specific leaf area or low maximum height), whose juveniles might be particularly susceptible to competition with IAPs, but not for TET taxa with large seeds, whose metabolic reserves make seedlings more likely to attain a critical size. These findings suggest that IAPs can significantly contribute to the extinction dynamics of trees, primarily by limiting regeneration through competitive exclusion, and that their impacts vary depending on the traits of the affected taxa.

    ano.nymous@ccsd.cnrs.fr.invalid (Robin Pouteau) 08 Jan 2026

    https://hal.science/hal-05448009v1
  • [hal-05508569] Decreasing frequency and extent of frost damage in European oaks over 1961-2021

    <div><p>Late spring frosts (LSF) have substantial ecological and economic impacts in the temperate and boreal zones. Yet, the effects of climate warming on the frequency (i.e., probability of LSF in a given year, in %) and extent (i.e., percentage of trees in a population damaged by a given LSF event) of LSF damage remain underexplored. Here, extending a budburst model that accounts for within-population variability, we developed and evaluated a new model of LSF damage occurrence and extent using 1,220 observations of LSF damage to newly emerged leaves from 304 oak populations in France (1997-2021). Our model simulations reveal that overall, French oak populations are, over time, less exposed to LSF amid ongoing climate change. We observed an overall decline in the frequency (-0.22 % per year) and extent (-0.34 % per year) of LSF damage in French oak populations over the past six decades (1961-2021). These trends are largely driven by the temporal advance of both the last spring frost day and budburst dates, with the last spring frost day advancing at a slightly faster rate (-0.28 days per year) than budburst (-0.21 days per year). This temporal mismatch explains why, contrary to the common assumption that earlier budburst increases frost risk, earlier budburst was in fact associated with a lower frequency of LSF damage. Nevertheless, considerable geographical variability emerged, with declines in damage frequency being more pronounced in continental regions, whereas declines in damage extent were more pronounced in coastal regions. Our findings underscore the importance of considering both LSF frequency and extent when assessing frost risks in a warming climate, offering a comprehensive framework for future ecological and economic evaluations of LSF impacts.</p></div>

    ano.nymous@ccsd.cnrs.fr.invalid (Jianhong Lin) 13 Feb 2026

    https://hal.inrae.fr/hal-05508569v1
  • [hal-05422406] Understory plant indicator values poorly perform at monitoring temporal changes in French forest soil chemical properties

    Understory plant communities are widely used to infer soil conditions through species indicator values (IVs), scores reflecting species’ ecological preferences for factors such as soil acidity, moisture, or nutrient levels. While their reliability to describe soil conditions along spatial gradients is well established, their ability to capture temporal changes in soil chemistry remains largely untested at both temporal and geographical scales. We combined 26 years of vegetation monitoring with two French national soil surveys (1993–1997; 2007–2012) across 102 permanent forest plots to assess the reliability of community soil indices (CSIs) as bioindicators of soil pH, carbon-to-nitrogen ratio (C/N), and extractable phosphorus. CSIs were computed by averaging species IVs for each plot and survey. Temporal dynamics of measured soil properties and CSIs were analyzed using mixed-effects models at the national scale, while local trends were estimated separately for each plot to directly compare measured and vegetation-inferred changes. CSIs showed strong spatial correlations with measured pH and C/N, but weaker relationships for phosphorus. In contrast, no significant coupling was found between temporal changes in CSIs and measured soil parameters, with frequent mismatches in both direction and magnitude at the plot level. Measured soil dynamics were mainly driven by initial edaphic conditions and stand age, whereas CSI dynamics responded primarily to canopy openness and anthropogenic disturbances such tree harvesting. These findings confirm the value of IVs for spatial bioindication but highlight their limited sensitivity for detecting long-term soil changes, especially where soil changes remain modest.

    ano.nymous@ccsd.cnrs.fr.invalid (Robinson Ribémont) 07 Jan 2026

    https://hal.science/hal-05422406v1
  • [hal-04723745] Tree ring detection for raw wood cross-section image analysis

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    ano.nymous@ccsd.cnrs.fr.invalid (Rémi Decelle) 07 Oct 2024

    https://hal.science/hal-04723745v1