Adapting forests to climate change

Partner RNP: Oise

INRAE departments and units: ECODIV – UR BEF, UMR IAM, UMR BIOGECO, UR EFNO, USC P2E, URZF

40% of Chantilly forest is affected by dieback, mainly as a result of climate change. Because of the highly draining sandy soil and the dry microclimate, this area is considered to be an avant-garde laboratory representative of the future impacts of climate change, which could affect many French forest areas. The rise in temperature is having a major impact on the pedunculate (or ‘English’) oak, the key species in this ecosystem, which is highly vulnerable and poorly adapted to dry climatic conditions.

An interdisciplinary research-action programme bringing together twelve laboratories and over forty researchers was set up in 2020. It is led by INRAE via the LabEx ARBRE. The project also involves 300 volunteers who are helping to map the 6,300 hectares of forest and take 13,000 soil samples from several hundred plots. These samples will be used to study the genetic make-up of the trees and identify those that are most resistant to these soils. In addition, certain tree species considered to be more resistant to water stress are being planted on an experimental basis to determine which will be best adapted to the climate of the future.

Owners, managers, elected representatives, scientists and associations have collectively drawn up an action plan and management scenarios based on projected changes in vegetation and climate. This innovative participatory approach has been put into practice in the field by testing new regeneration methods and laying the foundations for the assisted migration of European tree species. A long-term roadmap to monitor the forest’s evolution has also been drawn up.

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