{"id":40986,"date":"2024-04-15T09:20:30","date_gmt":"2024-04-15T07:20:30","guid":{"rendered":"https:\/\/foretnature.be\/?post_type=resume-foret-mail&#038;p=40986"},"modified":"2024-04-15T09:20:30","modified_gmt":"2024-04-15T07:20:30","slug":"besoins-en-lumiere-et-taille-de-trouees-de-la-theorie-a-la-realite","status":"publish","type":"resume-foret-mail","link":"https:\/\/foretnature.be\/en\/resume-foret-mail\/besoins-en-lumiere-et-taille-de-trouees-de-la-theorie-a-la-realite\/","title":{"rendered":"Besoins en lumi\u00e8re et taille de trou\u00e9es, de la th\u00e9orie \u00e0 la r\u00e9alit\u00e9"},"content":{"rendered":"<p>Des forestiers suisses ont sch\u00e9matis\u00e9 les besoins en lumi\u00e8re des diff\u00e9rentes essences foresti\u00e8res et la disponibilit\u00e9 en lumi\u00e8re dans des trou\u00e9es. Sur base d\u2019un classement en 5 cat\u00e9gories allant de l\u2019essence d\u2019ombre \u00e0 l\u2019essence de pleine lumi\u00e8re et de la disponibilit\u00e9 en lumi\u00e8re en fonction de la taille et de la position \u00e0 l\u2019int\u00e9rieur de la trou\u00e9e, ils en d\u00e9duisent la taille optimale de trou\u00e9e \u00e0 envisager selon l\u2019essence souhait\u00e9e.<\/p>\n<p>Une essence n\u00e9cessitant une lumi\u00e8re \u00ab extr\u00eame \u00bb comme le bouleau, le m\u00e9l\u00e8ze, le saule ou le ch\u00eane rouge ne trouverait pas r\u00e9ponse \u00e0 ses besoins dans une trou\u00e9e de moins de 25 ares et une essence de lumi\u00e8re comme les pins, les ch\u00eanes sessile et p\u00e9doncul\u00e9, le sorbier ou encore le peuplier tremble demanderait une ouverture de minimum 16 ares. De leur c\u00f4t\u00e9, le charme et les \u00e9rables sycomore et plane se contenteraient de 4 ares. La lumi\u00e8re optimale se situe essentiellement dans la partie nord de la trou\u00e9e, et au centre de celle-ci pour les trou\u00e9es plus grandes.<\/p>\n<p>Cette th\u00e9orie est valable en conditions plates, entour\u00e9es de peuplements adultes ferm\u00e9s, situ\u00e9s sur bons sols avec des arbres de hauteur correspondante et typiques du plateau suisse, donc plut\u00f4t de type h\u00eatraie \u00e0 Luzule. Au fil du temps, les trou\u00e9es devront \u00eatre \u00e9largies pour maintenir des conditions optimales pour les essences de lumi\u00e8re et \u00e9viter que les essences d\u2019ombre ne prennent le dessus.<\/p>\n<p>Les auteurs de l\u2019article reconnaissent que leur th\u00e9orie se limite \u00e0 la disponibilit\u00e9 en lumi\u00e8re en tant que facteur central du rajeunissement et n\u00e9glige les effets \u00e9cologiques d\u00e9favorables et croissants avec la taille des trou\u00e9es : alt\u00e9ration du climat forestier, lessivage d\u2019\u00e9l\u00e9ments nutritifs, d\u00e9veloppement des adventices&#8230; L\u2019article traite \u00e9galement uniquement de l\u2019apport de lumi\u00e8re directe mais les auteurs pr\u00e9cisent que des peuplement \u00e9tag\u00e9s pas trop denses, laissant passer plus de lumi\u00e8re diffuse, pourraient pr\u00e9senter des zones \u00e9galement favorables \u00e0 la r\u00e9g\u00e9n\u00e9ration des essences exigeantes en lumi\u00e8re, pour autant qu\u2019un suivi soit assur\u00e9.<\/p>\n<p>Entre une application trop th\u00e9orique et sch\u00e9matique dans l\u2019ouverture de trou\u00e9es et un laisser-faire menant \u00e0 la perte des essences les plus exigeantes, le juste milieu est \u00e0 trouver, s\u2019appuyant sur une bonne connaissance des besoins en lumi\u00e8re de chaque essence et de la dynamique foresti\u00e8re.<\/p>","protected":false},"excerpt":{"rendered":"<p>Des forestiers suisses ont sch\u00e9matis\u00e9 les besoins en lumi\u00e8re des diff\u00e9rentes essences foresti\u00e8res et la disponibilit\u00e9 en lumi\u00e8re dans des trou\u00e9es. Sur base d\u2019un classement en 5 cat\u00e9gories allant de l\u2019essence d\u2019ombre \u00e0 l\u2019essence de pleine lumi\u00e8re et de la disponibilit\u00e9 en lumi\u00e8re en fonction de la taille et de la position \u00e0 l\u2019int\u00e9rieur de [&hellip;]<\/p>","protected":false},"featured_media":40987,"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>Besoins en lumi\u00e8re et taille de trou\u00e9es, de la th\u00e9orie \u00e0 la r\u00e9alit\u00e9 - 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\/besoins-en-lumiere-et-taille-de-trouees-de-la-theorie-a-la-realite\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Besoins en lumi\u00e8re et taille de trou\u00e9es, de la th\u00e9orie \u00e0 la r\u00e9alit\u00e9 - For\u00eat.Nature\" \/>\n<meta property=\"og:description\" content=\"Des forestiers suisses ont sch\u00e9matis\u00e9 les besoins en lumi\u00e8re des diff\u00e9rentes essences foresti\u00e8res et la disponibilit\u00e9 en lumi\u00e8re dans des trou\u00e9es. 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