{"id":13070,"date":"2017-05-17T13:37:16","date_gmt":"2017-05-17T11:37:16","guid":{"rendered":"https:\/\/edu.ge.ch\/site\/edd\/?p=13070"},"modified":"2018-07-11T18:50:03","modified_gmt":"2018-07-11T16:50:03","slug":"une-vegetation-en-evolution","status":"publish","type":"post","link":"https:\/\/edu.ge.ch\/site\/edd\/une-vegetation-en-evolution\/","title":{"rendered":"Une v\u00e9g\u00e9tation en \u00e9volution"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 hundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-overflow:visible;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-one-full fusion-column-first fusion-column-last\" style=\"--awb-bg-size:cover;\"><div class=\"fusion-column-wrapper fusion-flex-column-wrapper-legacy\"><div class=\"fusion-title title fusion-title-1 fusion-sep-none fusion-title-text fusion-title-size-one\" style=\"--awb-margin-top-small:10px;--awb-margin-right-small:0px;--awb-margin-bottom-small:10px;--awb-margin-left-small:0px;\"><h1 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;\">Des plantes discr\u00e8tes mais vari\u00e9es<\/h1><\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_1 1_1 fusion-one-full fusion-column-first fusion-column-last fusion-column-no-min-height\" style=\"--awb-bg-size:cover;--awb-margin-bottom:0px;\"><div class=\"fusion-column-wrapper fusion-flex-column-wrapper-legacy\"><div class=\"fusion-text fusion-text-1\"><p>Une toiture v\u00e9g\u00e9talis\u00e9e ne ressemble g\u00e9n\u00e9ralement pas \u00e0 un jardin suspendu d\u00e9bordant de plantes luxuriantes. Afin d\u2019\u00e9viter de surcharger la dalle du toit, on y d\u00e9pose seulement une dizaine de centim\u00e8tres d\u2019un sol tr\u00e8s min\u00e9ral et peu fertile, sur lequel pousse une flore discr\u00e8te adapt\u00e9e \u00e0 la s\u00e9cheresse. Cependant, en variant les mat\u00e9riaux du sol et les \u00e9paisseurs, et en y pla\u00e7ant des plantes sauvages natives de la r\u00e9gion, on peut obtenir une tr\u00e8s grande biodiversit\u00e9 \u2013 et pas seulement au niveau de la flore, mais aussi au niveau de la faune.<\/p>\n<p>Lorsqu\u2019on s\u00e8me des m\u00e9langes de graines pour recr\u00e9er des milieux naturels particuliers, il faut 3 ou 4 ans pour en observer le d\u00e9veloppement maximal. Et toutes les graines du m\u00e9lange ne vont pas germer et cro\u00eetre: seules celles qui sont adapt\u00e9es aux caract\u00e9ristiques du terrain et aux conditions m\u00e9t\u00e9orologiques de la toiture vont se d\u00e9velopper.<\/p>\n<\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_1_1 1_1 fusion-one-full fusion-column-first fusion-column-last\" style=\"--awb-bg-size:cover;\"><div class=\"fusion-column-wrapper fusion-flex-column-wrapper-legacy\"><div class=\"fusion-title title fusion-title-2 fusion-sep-none fusion-title-text fusion-title-size-one\" style=\"--awb-margin-top-small:10px;--awb-margin-right-small:0px;--awb-margin-bottom-small:10px;--awb-margin-left-small:0px;\"><h1 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;\">Les pionni\u00e8res ne durent qu\u2019un temps<\/h1><\/div><div class=\"fusion-text fusion-text-2\"><p>En g\u00e9n\u00e9ral, la v\u00e9g\u00e9tation prend quelques ann\u00e9es pour recouvrir l\u2019espace \u00e0 disposition, avant de se stabiliser progressivement. Au d\u00e9but, le sol est d\u2019abord colonis\u00e9 par des esp\u00e8ces annuelles pionni\u00e8res, bien adapt\u00e9es pour vivre dans un milieu vierge. Puis les pionni\u00e8res \u2013 qui ne supportent pas la comp\u00e9tition des autres plantes \u2013 sont remplac\u00e9es peu \u00e0 peu par des esp\u00e8ces p\u00e9rennes, capables de vivre plusieurs ann\u00e9es.<\/p>\n<p>Au fil du temps, la toiture re\u00e7oit aussi des graines amen\u00e9es notamment par le vent et les oiseaux. Certaines vont germer et enrichir la biodiversit\u00e9 du lieu, mais d\u2019autres peuvent menacer la biodiversit\u00e9 ou l\u2019int\u00e9grit\u00e9 du toit \u2013 et il faudra les arracher (voir le panneau Surveiller les intrus pour maintenir la biodiversit\u00e9).<\/p>\n<\/div><div class=\"fusion-clearfix\"><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":3795,"featured_media":13102,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[257,90],"tags":[102,326,302,303,221,307],"ecole-et-commune":[],"evenement":[],"class_list":["post-13070","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nature-echo-2017","category-zoom","tag-biodiversite","tag-flore","tag-nature-echo","tag-plantes","tag-toiture-vegetalisee","tag-vegetation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - 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