{"id":44210,"date":"2024-10-23T16:41:17","date_gmt":"2024-10-23T14:41:17","guid":{"rendered":"https:\/\/foretnature.be\/?post_type=article-foret-nature&#038;p=44210"},"modified":"2024-10-23T16:41:17","modified_gmt":"2024-10-23T14:41:17","slug":"mecanismes-biologiques-de-tolerance-a-lombrage","status":"publish","type":"article-foret-nature","link":"https:\/\/foretnature.be\/en\/article-foret-nature\/mecanismes-biologiques-de-tolerance-a-lombrage\/","title":{"rendered":"M\u00e9canismes biologiques de tol\u00e9rance \u00e0 l\u2019ombrage"},"content":{"rendered":"<p>On sait que les exigences en lumi\u00e8re diff\u00e8rent sensiblement d\u2019une essence \u00e0 l\u2019autre. C\u2019est un crit\u00e8re essentiel pour l\u2019installation de la r\u00e9g\u00e9n\u00e9ration naturelle et la composition des futurs peuplements. Il est important de conna\u00eetre les m\u00e9canismes biologiques qui expliquent ces diff\u00e9rences de tol\u00e9rance entre esp\u00e8ces pour mieux cibler les interventions sylvicoles \u00e0 mettre en place. Des \u00e9tudes ont \u00e9t\u00e9 men\u00e9es afin de bien comprendre ce qui expliquait les diff\u00e9rences de tol\u00e9rance \u00e0 l\u2019ombrage entre essences. En for\u00eat, les conditions de croissance ne sont pas homog\u00e8nes. Entre une clairi\u00e8re et un couvert dense, les diff\u00e9rences sont nombreuses et ne sont pas uniquement li\u00e9es \u00e0 l\u2019apport de lumi\u00e8re. Les disponibilit\u00e9s en eau et en min\u00e9raux du sol y sont totalement diff\u00e9rentes, l\u2019id\u00e9al est donc de travailler avec des ombri\u00e8res artificielles et de cultiver des individus dans des substrats identiques avec des r\u00e9gimes d\u2019irrigation adapt\u00e9s. Gr\u00e2ce \u00e0 cette m\u00e9thode de travail, appliqu\u00e9e \u00e0 diff\u00e9rentes essences, les \u00e9tudes ont amen\u00e9 diff\u00e9rents r\u00e9sultats. Selon les auteurs, les principaux enseignements tir\u00e9s sont les suivants : la tol\u00e9rance \u00e0 l\u2019ombrage des jeunes arbres est li\u00e9e \u00e0 leur capacit\u00e9 de survie sous ombre et non \u00e0 leur capacit\u00e9 de croissance ; il existe une dimension maximale que les semis peuvent atteindre dans un environnement lumineux donn\u00e9. De cette fa\u00e7on ils \u00e9vitent d\u2019augmenter trop leurs d\u00e9penses en carbone ; la tol\u00e9rance \u00e0 l\u2019ombre est d\u00e9termin\u00e9e par la capacit\u00e9 \u00e0 maintenir un bilan carbone positif ; la strat\u00e9gie des essences tol\u00e9rantes leur assure une survie sous le couvert, mais elle n\u2019est efficace que si les individus sont capables de reprendre une croissance soutenue lorsqu\u2019ils sont remis \u00e0 la lumi\u00e8re.<\/p>","protected":false},"excerpt":{"rendered":"<p>On sait que les exigences en lumi\u00e8re diff\u00e8rent sensiblement d\u2019une essence \u00e0 l\u2019autre. C\u2019est un crit\u00e8re essentiel pour l\u2019installation de la r\u00e9g\u00e9n\u00e9ration naturelle et la composition des futurs peuplements. Il est important de conna\u00eetre les m\u00e9canismes biologiques qui expliquent ces diff\u00e9rences de tol\u00e9rance entre esp\u00e8ces pour mieux cibler les interventions sylvicoles \u00e0 mettre en place. [&hellip;]<\/p>","protected":false},"featured_media":0,"template":"","categories":[49],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>M\u00e9canismes biologiques de tol\u00e9rance \u00e0 l\u2019ombrage - 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\/article-foret-nature\/mecanismes-biologiques-de-tolerance-a-lombrage\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"M\u00e9canismes biologiques de tol\u00e9rance \u00e0 l\u2019ombrage - For\u00eat.Nature\" \/>\n<meta property=\"og:description\" content=\"On sait que les exigences en lumi\u00e8re diff\u00e8rent sensiblement d\u2019une essence \u00e0 l\u2019autre. 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