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Santé des forêts et biodiversité

Abstract : Forest diebacks are likely to increase in response to climate change, with increased frequency and intensity of droughts in some parts of the world (including Europe) already visible in forests. The progressive deterioration of the state of health of a stand is accompanied by the appearance / increase of certain habitats / certain resources, potentially favorable to certain organisms (opportunities for (temporary) resurgence for taxa currently under threat) and unfavorable to other species (risks of loss of ecosystem services). The impact of forest dieback on biodiversity has been poorly studied, and we approach it here via two research projects: BUCHE and Climtree. The BUCHE project is a methodological project on diebacks and pests, with secondary results on forest biodiversity, led in the forest of Vierzon, an oakwood that has experienced repeated diebacks (1920, 1940, 1980, 2000 - 2004 ). Since 2016, we have conducted a sampling of certain groups of saproxylic insects in dendromicrohabitats modified by dieback (canopy & sap runs) for the study of links between dieback and biodiversity. Despite the fact that we used a limited design, we observed positive dieback effects on saproxylic taxa (dependent on deadwood), in quantitative & qualitative terms. This exploratory work remains to be extended on a larger scale (more plots and forests), and on more varied taxonomic / functional groups. The Climtree project focuses on the effects of silver fir dieback on the biodiversity in Pyrenean forests. The average defoliation index of fir trees, a species highly sensitive to water deficit, has increased in the southern limit of its range since 2000, especially in the Pyrenees. As part of our sociological study on the response of local forest stakeholders to the decline of the fir forests following climate change, a typology of landowners was constructed. On the other hand, our ecological study analyzes the response of biodiversity to dieback through a sampling design in 2 regions of the Pyrenees. According to the initial results, the structure of fir stands is affected by the level of decline, and to a lesser extent by salvage logging, but this does not significantly change the biodiversity. In conclusion, forest changes through dieback result in habitat and resource changes with potentially large impacts on a major reservoir of biodiversity. The direction and intensity of the changes are, however, still difficult to predict and vary according to the functional / taxonomic groups and the forest.
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Conference papers
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https://hal.inrae.fr/hal-02608148
Contributor : Migration Irstea Publications <>
Submitted on : Saturday, May 16, 2020 - 3:27:27 PM
Last modification on : Wednesday, February 17, 2021 - 3:32:26 AM

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  • HAL Id : hal-02608148, version 1
  • IRSTEA : PUB00059265

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Aurélien Sallé, Christophe Bouget. Santé des forêts et biodiversité. Colloque MIDI « Mutations forestières dans le cadre des changements globaux », Nov 2018, Blois, France. pp.29. ⟨hal-02608148⟩

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