{"id":41021,"date":"2024-05-13T11:12:01","date_gmt":"2024-05-13T09:12:01","guid":{"rendered":"https:\/\/foretnature.be\/?post_type=resume-foret-mail&#038;p=41021"},"modified":"2024-05-13T11:16:14","modified_gmt":"2024-05-13T09:16:14","slug":"face-aux-perturbations-en-tous-genres-les-lents-et-lourds-ont-la-cote","status":"publish","type":"resume-foret-mail","link":"https:\/\/foretnature.be\/en\/resume-foret-mail\/face-aux-perturbations-en-tous-genres-les-lents-et-lourds-ont-la-cote\/","title":{"rendered":"Face aux perturbations en tous genres, les lents et lourds ont la cote !"},"content":{"rendered":"<p>Comprendre la sensibilit\u00e9 sp\u00e9cifique des essences foresti\u00e8res aux perturbations est essentiel pour pr\u00e9dire l\u2019\u00e9volution de nos \u00e9cosyst\u00e8mes forestiers dans le contexte des changements climatiques. \u00c0 partir de donn\u00e9es issues des inventaires nationaux fran\u00e7ais, espagnol et finlandais, des chercheurs ont mod\u00e9lis\u00e9 la probabilit\u00e9 de mortalit\u00e9 de 40 esp\u00e8ces d\u2019arbres europ\u00e9ennes sur base de diff\u00e9rents caract\u00e8res.<\/p>\n<p>L\u2019\u00e9tude montre que la sensibilit\u00e9 des esp\u00e8ces aux perturbations s\u2019explique assez bien par la combinaison de diff\u00e9rents caract\u00e8res. La r\u00e9sistance au feu, par exemple, est en lien avec la dimension de l\u2019arbre : les petits individus r\u00e9sistent moins au feu que les gros. Les esp\u00e8ces sensibles au feu ont aussi une \u00e9corce fine, sont peu tol\u00e9rantes \u00e0 l\u2019ombre et ont un rapport C\/N de leurs feuilles \u00e9lev\u00e9.<\/p>\n<p>Les esp\u00e8ces sensibles aux temp\u00eates ont un rapport hauteur sur diam\u00e8tre \u00e0 1,30 m (H\/d) \u00e9lev\u00e9, un bois de faible densit\u00e9 et une forte croissance en hauteur.<\/p>\n<p>Chez les r\u00e9sineux, la sensibilit\u00e9 aux temp\u00eates augmente avec la tol\u00e9rance \u00e0 l\u2019ombre, et la sensibilit\u00e9 au feu diminue avec la densit\u00e9 du bois.<\/p>\n<p>Quel que soit le type de perturbation, les r\u00e9sineux sont les plus sensibles et les feuillus, principalement du genre <em>Quercus<\/em>, les moins sensibles.<\/p>\n<p>L\u2019\u00e9tude a identifi\u00e9 des relations cl\u00e9s entre les traits fonctionnels des esp\u00e8ces et leur sensibilit\u00e9 aux perturbations, qui permettent des pr\u00e9dictions plus fiables sur l\u2019\u00e9volution de la structure et de la composition de la for\u00eat future \u00e0 une large \u00e9chelle spatiale. Elle trouve une synergie entre les strat\u00e9gies menant \u00e0 une haute r\u00e9sistance aux diff\u00e9rentes perturbations et diff\u00e9rents traits tels qu\u2019un bois de haute densit\u00e9 ou une croissance faible. Par exemple, une forte densit\u00e9 de bois va limiter la propagation de la pourriture dans les arbres bless\u00e9s suite \u00e0 une perturbation et augmenter la r\u00e9sistance \u00e0 la cavitation dans le xyl\u00e8me, donc la r\u00e9sistance \u00e0 la s\u00e9cheresse.<\/p>\n<p>Ils constatent que la plupart des traits associ\u00e9s \u00e0 une forte sensibilit\u00e9 aux perturbations caract\u00e9risent plut\u00f4t des esp\u00e8ces productives. Les forestiers peuvent donc s\u2019attendre \u00e0 ce que, \u00e0 l&rsquo;avenir, la s\u00e9lection porte sur des essences moins productives mais plus r\u00e9sistantes.<\/p>","protected":false},"excerpt":{"rendered":"<p>Comprendre la sensibilit\u00e9 sp\u00e9cifique des essences foresti\u00e8res aux perturbations est essentiel pour pr\u00e9dire l\u2019\u00e9volution de nos \u00e9cosyst\u00e8mes forestiers dans le contexte des changements climatiques. \u00c0 partir de donn\u00e9es issues des inventaires nationaux fran\u00e7ais, espagnol et finlandais, des chercheurs ont mod\u00e9lis\u00e9 la probabilit\u00e9 de mortalit\u00e9 de 40 esp\u00e8ces d\u2019arbres europ\u00e9ennes sur base de diff\u00e9rents caract\u00e8res. L\u2019\u00e9tude [&hellip;]<\/p>","protected":false},"featured_media":41022,"template":"","categories":[50],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Face aux perturbations en tous genres, les lents et lourds ont la cote ! - 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\/face-aux-perturbations-en-tous-genres-les-lents-et-lourds-ont-la-cote\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Face aux perturbations en tous genres, les lents et lourds ont la cote ! - For\u00eat.Nature\" \/>\n<meta property=\"og:description\" content=\"Comprendre la sensibilit\u00e9 sp\u00e9cifique des essences foresti\u00e8res aux perturbations est essentiel pour pr\u00e9dire l\u2019\u00e9volution de nos \u00e9cosyst\u00e8mes forestiers dans le contexte des changements climatiques. \u00c0 partir de donn\u00e9es issues des inventaires nationaux fran\u00e7ais, espagnol et finlandais, des chercheurs ont mod\u00e9lis\u00e9 la probabilit\u00e9 de mortalit\u00e9 de 40 esp\u00e8ces d\u2019arbres europ\u00e9ennes sur base de diff\u00e9rents caract\u00e8res. 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