{"id":403,"date":"2012-08-09T08:38:57","date_gmt":"2012-08-09T06:38:57","guid":{"rendered":"http:\/\/www.youlab.fr\/blog\/?p=403"},"modified":"2012-08-08T22:39:42","modified_gmt":"2012-08-08T20:39:42","slug":"vegetaux-emetteurs-de-methane","status":"publish","type":"post","link":"https:\/\/www.youlab.fr\/blog\/403-vegetaux-emetteurs-de-methane\/","title":{"rendered":"Vilains arbres pollueurs!"},"content":{"rendered":"<p style=\"text-align: justify;\"><a href=\"http:\/\/www.youlab.fr\/blog\/wp-content\/uploads\/2012\/08\/biologie-v\u00e9g\u00e9tale-arbre-infect\u00e9-par-champignon.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-407\" title=\"biologie v\u00e9g\u00e9tale arbre infect\u00e9 par champignon\" src=\"http:\/\/www.youlab.fr\/blog\/wp-content\/uploads\/2012\/08\/biologie-v\u00e9g\u00e9tale-arbre-infect\u00e9-par-champignon-225x300.jpg\" alt=\"\" width=\"225\" height=\"300\" srcset=\"https:\/\/www.youlab.fr\/blog\/wp-content\/uploads\/2012\/08\/biologie-v\u00e9g\u00e9tale-arbre-infect\u00e9-par-champignon-225x300.jpg 225w, https:\/\/www.youlab.fr\/blog\/wp-content\/uploads\/2012\/08\/biologie-v\u00e9g\u00e9tale-arbre-infect\u00e9-par-champignon.jpg 450w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/a>Apr\u00e8s les vaches et leurs pets \u00e0 effet de serre, une toute nouvelle \u00e9tude publi\u00e9e dans Geophysical Research Letters\u00a0r\u00e9v\u00e8le que les arbres pourraient aussi \u00eatre une source importante de\u00a0m\u00e9thane\u00a0qui\u00a0contribuerait\u00a0donc au r\u00e9chauffement climatique!<\/p>\n<p style=\"text-align: justify;\">Les auteurs ont eu l&rsquo;id\u00e9e de mesurer les \u00e9missions de\u00a0gaz \u00e0 effet de serre\u00a0sur des parcelles de la for\u00eat de Yale (USA). Au bout d&rsquo;un an 1 Km\u00b2 de f\u00f4ret avait\u00a0\u00e9mis\u00a0en m\u00e9thane l&rsquo;\u00e9quivalent de la consommation de 40L d&rsquo;essence par une automobile.<\/p>\n<h3 style=\"text-align: justify;\">V\u00e9g\u00e9taux et production de m\u00e9thane?<\/h3>\n<p style=\"text-align: justify;\">Les biologistes, <a href=\"http:\/\/www.youlab.fr\/20-materiel-de-geologie-geologue\">g\u00e9ologue<\/a>s, climatologues et leurs \u00e9tudiants ont cherch\u00e9 \u00e0 connaitre la cause de cette production de m\u00e9thane. Ils ont montr\u00e9 que ce sont les arbres\u00a0s\u00e9nescents\u00a0et morts qui d\u00e9gagent du m\u00e9thane, \u00e0 une concentration en gaz 80000 fois sup\u00e9rieure aux niveaux de l&rsquo;air ambiant.\u00a0Les arbres produisant le plus de m\u00e9thane seraient donc selon eux, ceux ag\u00e9s de plus de 80 ans et ceux en d\u00e9composition. Ce\u00a0ph\u00e9nom\u00e8ne\u00a0serait en fait d\u00fb \u00e0 des champignons parasites qui infecteraient alors les arbres. Ils favoriseraient le d\u00e9veloppement de bact\u00e9ries m\u00e9thanog\u00e8nes, qui elles, seraient responsables de la production du gaz en d\u00e9gradant la mati\u00e8re organique des arbres.<\/p>\n<p style=\"text-align: justify;\">L&rsquo;\u00e9tudiant en th\u00e8se qui a men\u00e9 cette \u00e9tude indique qu&rsquo;il pense que ce ph\u00e9nom\u00e8ne peut \u00eatre significatif au niveau mondial, car tous les arbres en d\u00e9compositions \u00e9mettent du m\u00e9thane quelque soit le type d&rsquo;environnement dans lequel ils se trouvent. Il pourrait donc s&rsquo;agir d&rsquo;un ph\u00e9nom\u00e8ne non n\u00e9gligeable sur le r\u00e9chauffement\u00a0climatique\u00a0au niveau mondial.\u00a0Un des\u00a0m\u00e9t\u00e9orologues\u00a0co-auteur de l&rsquo;\u00e9tude avance m\u00eame que si l&rsquo;on extrapole leurs r\u00e9sultats \u00e0 l&rsquo;\u00e9chelle mondiale,\u00a0l\u2019\u00e9mission\u00a0foresti\u00e8re pourrait repr\u00e9senter 10% des \u00e9missions totales de m\u00e9thane dans l&rsquo;atmosph\u00e8re!<\/p>\n<p style=\"text-align: justify;\">Cette d\u00e9couverte pourrait mener \u00e0 s&rsquo;int\u00e9resser de plus pr\u00eat aux niveaux de gaz \u00e0 effet de serre d\u00e9gag\u00e9s par les\u00a0for\u00eat\u00a0pour tenter de les juguler. Mais bien entendu des \u00e9tudes compl\u00e9mentaires seront\u00a0n\u00e9cessaires\u00a0en laboratoire.<\/p>\n<h3 style=\"text-align: justify;\">Et alors les biologistes?<\/h3>\n<p style=\"text-align: justify;\">En lisant cette \u00e9tude on pourrait se dire que le r\u00e9chauffement climatique actuel, si d\u00e9cri\u00e9 est la faute des vilains arbres, vilains champignons, et surtout super vilaines bact\u00e9ries!\u00a0Mais attention il ne faut pas oublier que le r\u00e9chauffement climatique est un ph\u00e9nom\u00e8ne\u00a0totalement\u00a0naturel, qui a toujours eu lieu au cours des \u00e8res g\u00e9ologiques, avec des alternances de p\u00e9riodes glaci\u00e8res et de r\u00e9chauffements. (Cf notre article sur <a href=\"http:\/\/www.youlab.fr\/blog\/geologie-palmiers-antarctique\">les palmiers en antarctique<\/a>). Le r\u00e9chauffement climatique que nous connaissons aujourd&rsquo;hui est diff\u00e9rent de ces succ\u00e9ssions de climats durant les \u00e8res g\u00e9ologiques, car il est excessivement rapide. Il serait lui d\u00fb aux activit\u00e9s anthropiques \u00e9m\u00e9trices de gaz \u00e0 effet de serre depuis la r\u00e9volution industrielle.<\/p>\n<p style=\"text-align: justify;\">Et pour terminer il ne faut pas oublier qu&rsquo;avant de relarguer du m\u00e9thane les arbres sont durant leur vie le \u00ab\u00a0poumon\u00a0\u00bb de la plan\u00e8te et recyclent \u00e0 eux seuls des tonnes de CO2 qui est \u00e9galement un gaz \u00e0 effet de serre&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Apr\u00e8s les vaches et leurs pets \u00e0 effet de serre, une toute nouvelle \u00e9tude publi\u00e9e dans Geophysical Research Letters\u00a0r\u00e9v\u00e8le que les arbres pourraient aussi \u00eatre une source importante de\u00a0m\u00e9thane\u00a0qui\u00a0contribuerait\u00a0donc au r\u00e9chauffement climatique! Les auteurs ont eu l&rsquo;id\u00e9e de mesurer les \u00e9missions de\u00a0gaz \u00e0 effet de serre\u00a0sur des parcelles de la &#8230;<\/p>\n","protected":false},"author":1,"featured_media":407,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,83],"tags":[21,92,90],"class_list":["post-403","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biologie","category-geologie","tag-biologie-2","tag-biologie-vegetale","tag-geologie-2","has-thumbnail"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>v\u00e9g\u00e9taux et effets de serre<\/title>\n<meta name=\"description\" content=\"Belle \u00e9tude de biologie v\u00e9g\u00e9tale sur l\u2019\u00e9mission de m\u00e9thane par les arbres en d\u00e9composition.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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