{"id":46537,"date":"2026-06-10T15:47:26","date_gmt":"2026-06-10T13:47:26","guid":{"rendered":"https:\/\/foretnature.be\/?post_type=resume-foret-mail&p=46537"},"modified":"2026-06-11T11:31:26","modified_gmt":"2026-06-11T09:31:26","slug":"ne-jamais-oublier-de-manger","status":"publish","type":"resume-foret-mail","link":"https:\/\/foretnature.be\/en\/resume-foret-mail\/ne-jamais-oublier-de-manger\/","title":{"rendered":"Ne jamais oublier de manger !"},"content":{"rendered":"

Les changements climatiques, et en particulier l\u2019augmentation de la fr\u00e9quence des \u00e9v\u00e9nements extr\u00eames, impactent la productivit\u00e9 des for\u00eats et compromettent leur r\u00f4le crucial dans la r\u00e9gulation du cycle du carbone. Une \u00e9tude men\u00e9e sur les for\u00eats de la Communaut\u00e9 de Madrid (Espagne centrale) entre 1985 et 2018 analyse l’impact croissant des s\u00e9cheresses chaudes (\u00e9pisodes de d\u00e9ficit hydrique et de temp\u00e9ratures extr\u00eames) sur la productivit\u00e9 foresti\u00e8re. En combinant les donn\u00e9es des inventaires forestiers nationaux, relev\u00e9s LiDAR et images satellites Landsat pour 748 placettes permanentes, les chercheurs ont reconstitu\u00e9 des s\u00e9ries annuelles de biomasse et de productivit\u00e9.<\/p>\n

Les r\u00e9sultats confirment une intensification significative du d\u00e9ficit de pression de vapeur (VPD) et des s\u00e9cheresses en termes d’intensit\u00e9, de dur\u00e9e et de fr\u00e9quence. Si la biomasse totale a progress\u00e9 depuis les ann\u00e9es 1980, la productivit\u00e9 nette est rest\u00e9e stable, soumise \u00e0 une variabilit\u00e9 interannuelle croissante sous l’effet des al\u00e9as climatiques.<\/p>\n

Sous des conditions de s\u00e9cheresse extr\u00eames et r\u00e9currentes, les for\u00eats domin\u00e9es par des esp\u00e8ces hautement conservatrices (fermeture stomatique prolong\u00e9e en cas de stress pour \u00e9viter les ph\u00e9nom\u00e8nes de cavitation) ont montr\u00e9 des pertes de productivit\u00e9 de plus en plus marqu\u00e9es, li\u00e9es \u00e0 l’arr\u00eat de l\u2019alimentation en carbone. Les for\u00eats pr\u00e9sentant une diversit\u00e9 fonctionnelle \u00e9lev\u00e9e en traits hydrauliques ont par contre mieux maintenu leur productivit\u00e9. Les esp\u00e8ces tr\u00e8s r\u00e9sistantes \u00e0 la cavitation (ex. : Pinus sylvestris, Pinus pinaster<\/em>) ne sont donc pas n\u00e9cessairement les mieux arm\u00e9es sur le long terme face \u00e0 des s\u00e9cheresses de plus en plus fr\u00e9quentes.<\/p>\n

Ces r\u00e9sultats plaident pour une gestion sylvicole int\u00e9grant la diversification des strat\u00e9gies hydrauliques au sein des peuplements, notamment en contexte m\u00e9diterran\u00e9en. L’int\u00e9gration des traits fonctionnels dans les mod\u00e8les d’\u00e9valuation climatique et dans les plans de gestion foresti\u00e8re appara\u00eet d\u00e9sormais indispensable.<\/p>","protected":false},"excerpt":{"rendered":"

Les changements climatiques, et en particulier l\u2019augmentation de la fr\u00e9quence des \u00e9v\u00e9nements extr\u00eames, impactent la productivit\u00e9 des for\u00eats et compromettent leur r\u00f4le crucial dans la r\u00e9gulation du cycle du carbone. Une \u00e9tude men\u00e9e sur les for\u00eats de la Communaut\u00e9 de Madrid (Espagne centrale) entre 1985 et 2018 analyse l’impact croissant des s\u00e9cheresses chaudes (\u00e9pisodes de […]<\/p>","protected":false},"featured_media":46530,"template":"","categories":[50],"acf":[],"yoast_head":"\nNe jamais oublier de manger ! - For\u00eat.Nature<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/foretnature.be\/en\/resume-foret-mail\/ne-jamais-oublier-de-manger\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ne jamais oublier de manger ! - For\u00eat.Nature\" \/>\n<meta property=\"og:description\" content=\"Les changements climatiques, et en particulier l\u2019augmentation de la fr\u00e9quence des \u00e9v\u00e9nements extr\u00eames, impactent la productivit\u00e9 des for\u00eats et compromettent leur r\u00f4le crucial dans la r\u00e9gulation du cycle du carbone. 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