{"id":34350,"date":"2021-09-10T11:45:26","date_gmt":"2021-09-10T09:45:26","guid":{"rendered":"https:\/\/foretnature.be\/resume-foret-mail\/pollution-champignon-malnutrition\/"},"modified":"2021-09-10T11:45:26","modified_gmt":"2021-09-10T09:45:26","slug":"pollution-champignon-malnutrition","status":"publish","type":"resume-foret-mail","link":"https:\/\/foretnature.be\/en\/resume-foret-mail\/pollution-champignon-malnutrition\/","title":{"rendered":"Pollution + champignon = malnutrition"},"content":{"rendered":"<p>Les racines des arbres sont souvent prolong\u00e9es par de longs r\u00e9seaux de champignons appel\u00e9s mycorhizes avec lesquelles les arbres entretiennent une relation symbiotique, notamment en ce qui concerne la nutrition. Ces associations se basent sur l\u2019\u00e9change entre le carbone capt\u00e9 par les arbres, dans l\u2019atmosph\u00e8re, lors de la photosynth\u00e8se et l\u2019eau et les min\u00e9raux pr\u00e9lev\u00e9s par les champignons dans le sol.<br \/>\nAlors que la nutrition des arbres montre d\u2019importants signes de d\u00e9gradation, la diversit\u00e9 des mycorhizes reste m\u00e9connue et sa prise en compte dans la gestion foresti\u00e8re est d\u00e9licate. En effet, par l\u2019\u00e9tude de leurs parties \u00e9merg\u00e9es, appel\u00e9es carpophores, il a \u00e9t\u00e9 d\u00e9termin\u00e9 que la reproduction de certaines mycorhizes est sensible aux changements globaux mais leur croissance et leur association avec les racines restent floues.<br \/>\nDes chercheurs britanniques ont analys\u00e9 40 000 mycorhizes, \u00e0 partir de 13 000 \u00e9chantillons de sol collect\u00e9s sur 137 sites d&rsquo;observation r\u00e9partis dans 20 pays sous le couvert des essences les plus r\u00e9pandues en Europe. Les r\u00e9sultats montrent que la diversit\u00e9 des mycorhizes s\u2019explique principalement par l\u2019esp\u00e8ce h\u00f4te, son niveau de nutrition ainsi que par les conditions environnementales, telles que la pollution atmosph\u00e9rique et l\u2019acidit\u00e9 du sol.<br \/>\nIl a \u00e9t\u00e9 remarqu\u00e9 qu\u2019au-del\u00e0 d\u2019un certain seuil de pollution en azote, les communaut\u00e9s de mycorhizes changent. En effet, on y retrouve moins d\u2019esp\u00e8ces capables de mobiliser l\u2019azote dans les mati\u00e8res organiques du sol et davantage d\u2019esp\u00e8ces moins b\u00e9n\u00e9fiques pour l\u2019approvisionnement des arbres en nutriments. Ces \u00e9l\u00e9ments pourraient donc expliquer la tendance \u00e0 la d\u00e9gradation de la nutrition des arbres des for\u00eats europ\u00e9ennes.<br \/>\nOffice national des For\u00eats. La pollution affecte les champignons qui nourrissent les arbres en Europe. Communiqu\u00e9 de presse. 7\/06\/2018.<\/p>","protected":false},"excerpt":{"rendered":"<p>Les racines des arbres sont souvent prolong\u00e9es par de longs r\u00e9seaux de champignons appel\u00e9s mycorhizes avec lesquelles les arbres entretiennent une relation symbiotique, notamment en ce qui concerne la nutrition. Ces associations se basent sur l\u2019\u00e9change entre le carbone capt\u00e9 par les arbres, dans l\u2019atmosph\u00e8re, lors de la photosynth\u00e8se et l\u2019eau et les min\u00e9raux pr\u00e9lev\u00e9s [&hellip;]<\/p>","protected":false},"featured_media":0,"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>Pollution + champignon = malnutrition - 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\/pollution-champignon-malnutrition\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pollution + champignon = malnutrition - For\u00eat.Nature\" \/>\n<meta property=\"og:description\" content=\"Les racines des arbres sont souvent prolong\u00e9es par de longs r\u00e9seaux de champignons appel\u00e9s mycorhizes avec lesquelles les arbres entretiennent une relation symbiotique, notamment en ce qui concerne la nutrition. 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