As part of the LIFE FORECCAsT project, the Haut-Languedoc Regional Natural Park and the Regional Center for Forest Property (CRPF) Occitanie organized a symposium on climate risks and crisis management in the forest environment. This conference took place on the afternoon of Tuesday, March 27, 2018 at the Cinema Star in Saint-Pons de Thomières and gathered about fifty participants, gathered to attend the presentations of Xavier Gauquelin (Office National des Forêts - ONF), Raphaël Bec (CRPF Occitanie and Project Manager FORECCAsT), Jean-Baptiste Daubrée (Department of Forest Health of the Ministry of Agriculture and Food - DSF) and Michel Schneider (Météo France), then at a round table bringing together the previous speakers accompanied by Sylvain André (Forest Forests Alliance - AFB), Jean-Luc Arvieu (NFB) and Pascal Mathieu (CRPF Occitanie). Conference presentations are downloadable at the bottom of this article.
After a brief introduction by Juliane Casquet, coordinator of the FORECCAsT project at the Haut-Languedoc Regional Nature Park and host of the first part of the conference, Xavier Gauquelin opened the presentation with an intervention on the forest management guide in a health crisis. . After presenting the different phases of the health crises, the criteria of entry and exit crisis and the different types of health crises, he chained on the roles of the various actors involved in their management: owners, managers, correspondents-observers of the DSF, members of the DSF and forest research organizations. He also stressed the importance of forest health monitoring and how to monitor the observed phenomena.
Raphaël Bec then took the floor to narrow this issue on the particular context of the territory of Haut-Languedoc, a geographical area where three climates coexist and which is therefore particularly sensitive to severe climatic events. He also presented the guide "Managing the crises related to climate change in the Haut-Languedoc forest", for which he coordinated the writing, a specific variation of Xavier Gauquelin's work, which was distributed to all participants in the colloquium. . Then, he exposed the different local actors of climate crisis management and their respective roles. Finally, he described the system of participatory reporting of forest health problems, tested in 2017 on the territory of the Regional Natural Park of Haut-Languedoc in collaboration with the IGN, and emphasized the vital importance of strengthening surveillance systems. and vigilance in a climate context increasingly uncertain.
Third speaker of the first part of the conference, Jean-Baptiste Daubrée followed up with a presentation on the main risks and problems affecting the health of forests in the southern Massif Central in a context of climate change. After showing that diebacks appeared to be increasing in the southern part of Europe but not in the northern part, which he linked to the hypothesis that these diebacks were due to climate events like drought with a direct impact or indirectly on these phenomena, it has presented different types of risks for forests. Regarding abiotic risks, droughts, a risk directly related to climate change, are among the most important factors. Other abiotic factors, wind, winter frost and hail could also increase in frequency with climate changes. Regarding the biotic risks, some, such as the pathogen causing the red band disease or the spruce typograph, may be more prevalent with climate change while the progression of others such as chestnut cynips does not seem not be related to the climate. Conversely, ash chalarose progression may be limited, and its development is probably disadvantaged in hot conditions.
To conclude this series of interventions, Michel Schneider presented a series of tools and perspectives in terms of climate monitoring. Climate monitoring consists of characterizing periods or climatic hazards, qualifying them against a set of references, then formulating and disseminating information, all from data from a network of observations and mathematical models. This follow-up is available through a series of tools that the speaker then presented, such as Climascope, which allows periodic monitoring of seasonal rainfall and the obtaining of a regional monthly climate bulletin, as well as an event monitoring of the drought. shallow soils, heat waves, cold waves, strong winds and the danger of forest fires.
After a friendly coffee break around FORECCAsT's educational exhibition on forest and climate change, the second part of the symposium, led by Raphaël Bec, continued. It was devoted to a round table gathering the previous speakers accompanied by Sylvain André, Jean-Luc Arvieu and Pascal Mathieu. The exchanges between speakers and with the audience in a second time mainly concerned:
The round table was finally concluded jointly by Raphaël Bec and Juliane Casquet, stressing the importance of multidimensional forest management and the paramount importance of taking climate change into account in this management. A big thank you to the speakers and the participants, we hope that they will find the guide "Managing the crises related to climate change in the forest of Haut-Languedoc" useful and that they will have learned interesting things during the first conference of FORECCAsT !
- Talk by Xavier GAUQUELIN (ONF) :
Le guide de gestion des forêts en crise sanitaire
- Talk by Raphaël BEC (CRPF Occitanie) : Le plan d’action pour l’anticipation et la gestion des crises climatiques sur le Haut-Languedoc
- Talk by Jean-Baptiste DAUBREE (DSF) : Santé des forêts, principaux risques et problèmes dans le sud du Massif central
- Talk by Michel SCHNEIDER (Météo France) : Quelques outils et perspectives en matière de vigilance climatique
- Guide by Raphaël Bec (CRPF Occitanie) : Gérer les crises liées au changement climatique en forêt du Haut-Languedoc