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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article

04 février 2026

Rédaction : Corinne MARTIN

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

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.
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article

02 février 2026

Rédaction : Corinne Martin

CDD IE : Accompagnement méthodologique et mise en réseau des Living Labs forestiers du PEPR

Un des objectifs du PEPR FORESTT est d’accompagner le développement et la mise en réseau des Living Labs forestiers.
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Thèse (H/F) sur la modélisation de la biodiversité forestière

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Modélisation de la biodiversité forestière à large échelle dans un contexte de changement global

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Postes de MC à l'Université de Lorraine

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Deux postes de maître.sse de conférences vont être ouverts au concours au printemps 2026 dans l'UMR Silva

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ARBRES ET ARBUSTES DES FORÊTS TEMPÉRÉES - RECONNAISSANCE ET ÉCOLOGIE

 

HAL : Dernières publications

  • [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-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