{"id":707,"date":"2022-01-26T09:48:58","date_gmt":"2022-01-26T09:48:58","guid":{"rendered":"https:\/\/www.epl-bazas.fr\/Botanique\/?p=707"},"modified":"2022-02-05T18:38:40","modified_gmt":"2022-02-05T18:38:40","slug":"il-fait-froid","status":"publish","type":"post","link":"https:\/\/www.epl-bazas.fr\/Botanique\/2022\/01\/26\/il-fait-froid\/","title":{"rendered":"Il fait froid ! Qu&rsquo;en est-il pour les arbres de notre r\u00e9gion ?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"707\" class=\"elementor elementor-707\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-95856b1 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"95856b1\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6404b66d\" data-id=\"6404b66d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-31d7d536 elementor-widget elementor-widget-text-editor\" data-id=\"31d7d536\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><\/p>\n<p class=\"wp-block-paragraph\">Dans notre r\u00e9gion temp\u00e9r\u00e9e, les essences autochtones et les provenances locales sont adapt\u00e9es et subissent peu de d\u00e9g\u00e2ts. Les m\u00e9canismes physiologiques comme la chute des feuilles chez les feuillus, la descente de s\u00e8ve et la vidange de l&rsquo;eau des cellules \u00e0 l&rsquo;automne, la transformation de certaines r\u00e9serves glucidiques en chaines courtes moins sensibles, les cuticules \u00e9paisses des aiguilles&#8230; sont autant de processus qui permettent aux arbres de bien r\u00e9sister aux baisses de temp\u00e9ratures en hiver. <br><\/p><p>Cependant, attention aux grands froids&nbsp;!<\/p>\n<p><\/p>\n<p><\/p>\n<p class=\"wp-block-paragraph\">On parle de grands froids lorsque la temp\u00e9rature descend au-dessous de -20\u00b0C de fa\u00e7on durable (une semaine et plus).<\/p>\n<p><\/p>\n<p><\/p>\n<p class=\"wp-block-paragraph\"><\/p>\n<p><\/p>\n<p class=\"wp-block-paragraph\">Ainsi certains grands froids ont provoqu\u00e9s des dommages qui sont rest\u00e9s dans la m\u00e9moire des forestiers locaux : \u00e9radications successives des Pins maritime (<em>Pinus pinaster<\/em>) de provenance portugaise en f\u00e9vrier 1956 puis en f\u00e9vrier 1985&nbsp;! Lors de ce dernier \u00e9pisode les Eucalyptus plant\u00e9s furent aussi totalement \u00e9limin\u00e9s.<\/p>\n<p><\/p>\n<p><\/p>\n<p class=\"wp-block-paragraph\"><\/p>\n<p><\/p>\n<p class=\"wp-block-paragraph\">En outre, les tensions m\u00e9caniques \u00e0 l&rsquo;int\u00e9rieur du tronc engendr\u00e9es lors de ces grands froids peuvent entrainer une fissuration radiale nomm\u00e9e g\u00e9livure. Ainsi certains ch\u00eanes, en particulier le Ch\u00eane sessile <em>(Quercus rubra),&nbsp; <\/em>y sont particuli\u00e8rement sensibles. Le tronc cicatrise avec la formation d&rsquo;un bourrelet cicatriciel qui cache tr\u00e8s souvent une alt\u00e9ration interne du bois.<\/p>\n<p><\/p>\n<p><\/p>\n<p class=\"wp-block-paragraph\"><\/p>\n<p><\/p>\n<p><\/p>\n<p class=\"wp-block-paragraph\"><\/p>\n<p><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d8d732a elementor-widget elementor-widget-image-gallery\" data-id=\"d8d732a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image-gallery.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-image-gallery\">\n\t\t\t<div id='gallery-1' class='gallery galleryid-707 gallery-columns-3 gallery-size-thumbnail'><figure class='gallery-item'>\r\n    \t\t<div class='gallery-icon portrait'>\r\n    \t\t\t<a href='https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/027.jpg' data-fancybox='group3' data-caption='G\u00e9livure sur Ch\u00eane'><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/027-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-948\" \/><\/a>\r\n    \t\t<\/div>\r\n    \t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-1-948'>\r\n    \t\t\tG\u00e9livure sur Ch\u00eane\r\n    \t\t\t<\/figcaption><\/figure><figure class='gallery-item'>\r\n    \t\t<div class='gallery-icon portrait'>\r\n    \t\t\t<a href='https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/057.jpg' data-fancybox='group3' data-caption='Bourrelet cicatriciel'><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/057-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-949\" \/><\/a>\r\n    \t\t<\/div>\r\n    \t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-1-949'>\r\n    \t\t\tBourrelet cicatriciel\r\n    \t\t\t<\/figcaption><\/figure><figure class='gallery-item'>\r\n    \t\t<div class='gallery-icon landscape'>\r\n    \t\t\t<a href='https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/058.jpg' data-fancybox='group3' data-caption='Alt\u00e9rations'><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/058-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-950\" \/><\/a>\r\n    \t\t<\/div>\r\n    \t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-1-950'>\r\n    \t\t\tAlt\u00e9rations\r\n    \t\t\t<\/figcaption><\/figure>\r\n    \t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1a75a68 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1a75a68\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-97f1f7c\" data-id=\"97f1f7c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1096bfa elementor-widget elementor-widget-text-editor\" data-id=\"1096bfa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Le H\u00eatre commun (Fagus sylvatica) essence du montagnard pyr\u00e9n\u00e9en atlantique est assez r\u00e9sistant en conditions de pluviom\u00e9trie et surtout de tr\u00e8s forte humidit\u00e9 atmosph\u00e9rique.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4922547 elementor-widget elementor-widget-text-editor\" data-id=\"4922547\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1149\" src=\"https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/carte-BTS_0001_NEW-250x300.jpg\" alt=\"\" width=\"250\" height=\"300\" srcset=\"https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/carte-BTS_0001_NEW-250x300.jpg 250w, https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/carte-BTS_0001_NEW-853x1024.jpg 853w, https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/carte-BTS_0001_NEW-768x922.jpg 768w, https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/carte-BTS_0001_NEW-420x502.jpg 420w, https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/carte-BTS_0001_NEW-573x685.jpg 573w, https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/carte-BTS_0001_NEW-50x60.jpg 50w, https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/carte-BTS_0001_NEW.jpg 856w\" sizes=\"(max-width: 250px) 100vw, 250px\" \/>Le Sapin pectin\u00e9 (<i>Abies alba<\/i>) en \u00e9tage montagnard pyr\u00e9n\u00e9en r\u00e9siste jusqu&rsquo;\u00e0 -30\u00b0C . <\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-82dc594 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"82dc594\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-bb0ce63\" data-id=\"bb0ce63\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0bca366 elementor-widget elementor-widget-text-editor\" data-id=\"0bca366\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><u><b>A savoir : <\/b><\/u>certaines essences r\u00e9sineuses du genre Epic\u00e9a (<i>Picea abies, P.obovata&#8230;<\/i>), M\u00e9l\u00e8ze ( <i>Larix decidua, L.Laricina&#8230;<\/i>) et Pin ( <i>Pinus <\/i>s<i>ylvestris, P.uncinata, &#8230;<\/i>) sont tr\u00e8s r\u00e9sistantes \u00e0 des temp\u00e9ratures jusqu&rsquo;\u00e0 -40\u00b0C\u00a0 leur permettant de coloniser les \u00e9tages subalpins de nos montagnes ainsi que la zone bor\u00e9ale!<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a315869 elementor-widget elementor-widget-image-gallery\" data-id=\"a315869\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image-gallery.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-image-gallery\">\n\t\t\t<div id='gallery-2' class='gallery galleryid-707 gallery-columns-2 gallery-size-thumbnail'><figure class='gallery-item'>\r\n    \t\t<div class='gallery-icon landscape'>\r\n    \t\t\t<a href='https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/20190711_122610-scaled.jpg' data-fancybox='group2' data-caption='Pinus uncinata en montagnard pyr\u00e9n\u00e9en'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/20190711_122610-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-2-1153\" \/><\/a>\r\n    \t\t<\/div>\r\n    \t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-2-1153'>\r\n    \t\t\tPinus uncinata en montagnard pyr\u00e9n\u00e9en\r\n    \t\t\t<\/figcaption><\/figure><figure class='gallery-item'>\r\n    \t\t<div class='gallery-icon landscape'>\r\n    \t\t\t<a href='https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/Image21.jpg' data-fancybox='group2' data-caption='Larix laricina et Picea pungens dans la ta\u00efga canadienne'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.epl-bazas.fr\/Botanique\/wp-content\/uploads\/2022\/01\/Image21-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-2-929\" \/><\/a>\r\n    \t\t<\/div>\r\n    \t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-2-929'>\r\n    \t\t\tLarix laricina et Picea pungens dans la ta\u00efga canadienne\r\n    \t\t\t<\/figcaption><\/figure>\r\n    \t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Dans notre r\u00e9gion temp\u00e9r\u00e9e, les essences autochtones et les provenances locales sont adapt\u00e9es et subissent peu de d\u00e9g\u00e2ts. Les m\u00e9canismes physiologiques comme la chute des &hellip; <\/p>\n","protected":false},"author":3,"featured_media":709,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[],"class_list":["post-707","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualite"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Il fait froid ! Qu&#039;en est-il pour les arbres de notre r\u00e9gion ? - Des clics botaniques<\/title>\n<meta name=\"description\" content=\"Actualit\u00e9 - Le froid et la for\u00eat dans les Landes de Gascogne\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.epl-bazas.fr\/Botanique\/2022\/01\/26\/il-fait-froid\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Il fait froid ! 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