{"id":37698,"date":"2022-11-15T15:56:00","date_gmt":"2022-11-15T14:56:00","guid":{"rendered":"https:\/\/foretnature.be\/?post_type=resume-foret-mail&#038;p=37698"},"modified":"2022-11-15T15:56:00","modified_gmt":"2022-11-15T14:56:00","slug":"long-terme-secheresse-hetre","status":"publish","type":"resume-foret-mail","link":"https:\/\/foretnature.be\/en\/resume-foret-mail\/long-terme-secheresse-hetre\/","title":{"rendered":"Quels effets \u00e0 long terme de la s\u00e9cheresse sur le h\u00eatre ?"},"content":{"rendered":"<p>Suite \u00e0 la s\u00e9cheresse estivale de 2018, une \u00e9tude suisse a pu \u00e9valuer l\u2019impact de celle-ci sur les arbres et leur sant\u00e9 sur le long terme. L\u2019ann\u00e9e de la s\u00e9cheresse, un changement de couleur pr\u00e9matur\u00e9 des feuilles peut s\u2019observer sur plusieurs essences telles que le h\u00eatre, le bouleau, le ch\u00eane et l\u2019\u00e9rable. Il est int\u00e9ressant de savoir si les arbres se prot\u00e8gent d\u2019une transpiration excessive ou si la perte de leurs feuilles est r\u00e9ellement une faiblesse suite \u00e0 l\u2019interruption de l\u2019apport en eau.<\/p>\n<p>Gr\u00e2ce \u00e0 un suivi pluriannuel d\u2019environ mille h\u00eatres, consid\u00e9r\u00e9s jusqu\u2019alors comme assez r\u00e9sistants au d\u00e9ficit hydrique, les diff\u00e9rents impacts de la s\u00e9cheresse ont \u00e9t\u00e9 relev\u00e9s. Des h\u00eatres t\u00e9moins ont \u00e9galement \u00e9t\u00e9 s\u00e9lectionn\u00e9s, plus au sud, l\u00e0 o\u00f9 les pr\u00e9cipitations ont \u00e9t\u00e9 plus importantes.<\/p>\n<p>Il en r\u00e9sulte que la s\u00e9cheresse a constitu\u00e9 un \u00e9v\u00e9nement exceptionnel pour les arbres : 10 % de ceux affect\u00e9s par la perte de feuillage sont tout simplement morts dans les 4 ans, contre 2 % pour le groupe t\u00e9moin. De plus, 21 % des h\u00eatres ont d\u00fb \u00eatre abattus pour des raisons de s\u00e9curit\u00e9. Ce sont les grands arbres qui ont \u00e9t\u00e9 davantage endommag\u00e9s. Des dommages secondaires comme des l\u00e9sions de l\u2019\u00e9corce ou des trous de scolytes ont \u00e9t\u00e9 relev\u00e9s sur environ 20 % des arbres, mais l\u2019\u00e9tude ne permet pas de d\u00e9terminer une corr\u00e9lation primaire entre ces dommages et la s\u00e9cheresse.<\/p>\n<p>La perte du feuillage est donc un signe d\u2019affaiblissement pour une majorit\u00e9 des h\u00eatres \u00e9tudi\u00e9s. Il reste \u00e0 d\u00e9terminer si les prochaines s\u00e9cheresses aggraveront leur \u00e9tat ou si l\u2019acclimatation au fil du temps se fera pour les arbres touch\u00e9s. De quoi nous \u00e9clairer sur les possibles retomb\u00e9es de la s\u00e9cheresse de cet \u00e9t\u00e9.<\/p>\n<p>\u00ad<\/p>","protected":false},"excerpt":{"rendered":"<p>Suite \u00e0 la s\u00e9cheresse estivale de 2018, une \u00e9tude suisse a pu \u00e9valuer l\u2019impact de celle-ci sur les arbres et leur sant\u00e9 sur le long terme. L\u2019ann\u00e9e de la s\u00e9cheresse, un changement de couleur pr\u00e9matur\u00e9 des feuilles peut s\u2019observer sur plusieurs essences telles que le h\u00eatre, le bouleau, le ch\u00eane et l\u2019\u00e9rable. Il est int\u00e9ressant [&hellip;]<\/p>","protected":false},"featured_media":37681,"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>Quels effets \u00e0 long terme de la s\u00e9cheresse sur le h\u00eatre ? - 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\/long-terme-secheresse-hetre\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quels effets \u00e0 long terme de la s\u00e9cheresse sur le h\u00eatre ? - For\u00eat.Nature\" \/>\n<meta property=\"og:description\" content=\"Suite \u00e0 la s\u00e9cheresse estivale de 2018, une \u00e9tude suisse a pu \u00e9valuer l\u2019impact de celle-ci sur les arbres et leur sant\u00e9 sur le long terme. 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