{"id":89885,"date":"2015-10-27T13:49:37","date_gmt":"2015-10-27T12:49:37","guid":{"rendered":"http:\/\/batijournal.com\/?p=89885"},"modified":"2019-07-15T12:23:46","modified_gmt":"2019-07-15T10:23:46","slug":"si-le-rechauffement-climatique-diminuait-la-sequestration-du-carbone-par-les-arbres","status":"publish","type":"post","link":"https:\/\/batijournal.com\/index.php\/si-le-rechauffement-climatique-diminuait-la-sequestration-du-carbone-par-les-arbres\/89885\/","title":{"rendered":"Si le r\u00e9chauffement climatique diminuait la s\u00e9questration du carbone par les arbres ?"},"content":{"rendered":"<p>Une grande partie du carbone n\u00e9cessaire \u00e0 la croissance des arbres provient du dioxyde de carbone pr\u00e9sent dans l\u2019atmosph\u00e8re. Les for\u00eats capturent environ 15% des \u00e9missions de CO2 issu des activit\u00e9s humaines par an ; elles constituent ainsi le premier r\u00e9servoir pour la s\u00e9questration du carbone \u00e0 long terme. L\u2019augmentation de la circonf\u00e9rence des troncs et la production de la biomasse ligneuse (bois) sont deux processus cl\u00e9s dans les \u00e9cosyst\u00e8mes forestiers, pilotant respectivement la croissance en volume des arbres et la s\u00e9questration du carbone dans le bois. Jusqu\u2019\u00e0 pr\u00e9sent ces deux processus \u00e9taient consid\u00e9r\u00e9s comme totalement synchrones. Des chercheurs de l\u2019Inra ont d\u00e9montr\u00e9 que, dans les for\u00eats de conif\u00e8res de l\u2019h\u00e9misph\u00e8re nord, la production de la biomasse ligneuse est retard\u00e9e d\u2019environ un mois par rapport \u00e0 l\u2019augmentation de la circonf\u00e9rence des troncs. L\u2019arbre grossit d\u2019abord, en raison de la production et de l\u2019\u00e9largissement des cellules du bois qui renforcent leurs parois dans un second temps, augmentant de fait la masse de l\u2019arbre. Ces deux processus biologiques pr\u00e9sentent des sensibilit\u00e9s diff\u00e9rentes aux conditions climatiques. \u00a0Les chercheurs sugg\u00e8rent que les changements climatiques \u00e0 venir pourraient modifier le d\u00e9calage entre l\u2019augmentation de la circonf\u00e9rence des arbres et la production de la biomasse ligneuse, et affecter ainsi dans le futur la s\u00e9questration du carbone dans les \u00e9cosyst\u00e8mes forestiers.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une grande partie du carbone n\u00e9cessaire \u00e0 la croissance des arbres provient du dioxyde de carbone pr\u00e9sent dans l\u2019atmosph\u00e8re. Les for\u00eats capturent environ 15% des \u00e9missions de CO2 issu des activit\u00e9s humaines par an ; elles constituent ainsi le premier r\u00e9servoir pour la s\u00e9questration du carbone \u00e0 long terme. L\u2019augmentation de la circonf\u00e9rence des troncs [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":89886,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[6351],"tags":[44,861,772],"class_list":["post-89885","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-energie-environnement","tag-bois","tag-carbone","tag-foret"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Si le r\u00e9chauffement climatique diminuait la s\u00e9questration du carbone par les arbres ?<\/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:\/\/batijournal.com\/index.php\/si-le-rechauffement-climatique-diminuait-la-sequestration-du-carbone-par-les-arbres\/89885\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Si le r\u00e9chauffement climatique diminuait la s\u00e9questration du carbone par les arbres ?\" \/>\n<meta property=\"og:description\" content=\"Une grande partie du carbone n\u00e9cessaire \u00e0 la croissance des arbres provient du dioxyde de carbone pr\u00e9sent dans l\u2019atmosph\u00e8re. Les for\u00eats capturent environ 15% des \u00e9missions de CO2 issu des activit\u00e9s humaines par an ; elles constituent ainsi le premier r\u00e9servoir pour la s\u00e9questration du carbone \u00e0 long terme. 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