{"id":65216,"date":"2025-01-29T20:46:59","date_gmt":"2025-01-29T20:46:59","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/la-meteo-extreme-du-desert-americain-menace-les-cactus"},"modified":"2025-05-05T18:17:57","modified_gmt":"2025-05-05T18:17:57","slug":"la-meteo-extreme-du-desert-americain-menace-les-cactus","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/la-meteo-extreme-du-desert-americain-menace-les-cactus","title":{"rendered":"La M\u00e9t\u00e9o Extr\u00eame du D\u00e9sert Am\u00e9ricain Menace les Cactus"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Les cactus ge\u0301ants sont l\u2019emble\u0300me du de\u0301sert ame\u0301ricain. En Arizona, les saguaros, ces colosses verts he\u0301risse\u0301s d\u2019e\u0301pines peuvent atteindre 13 me\u0300tres de hauteur et vivre des centaines d\u2019anne\u0301es. Mais en se promenant dans ce de\u0301sert riche de ve\u0301ge\u0301taux en tous genres, un constat s\u2019impose: il est quasiment impossible de trouver de jeunes pousses de cactus.<\/p>\n<p>Les scientifiques s&rsquo;inquie\u0300tent pour l&rsquo;avenir des immenses saguaros dans le de\u0301sert de Sonora. Le phe\u0301nome\u0300ne n&rsquo;est pas nouveau: le manque de renouvellement de cactus a e\u0301te\u0301 constate\u0301 depuis le de\u0301but des anne\u0301es 1990. Depuis, le changement climatique, la multiplication des se\u0301cheresses et les incendies n&rsquo;ont eu de cesse d&rsquo;ane\u0301antir les chances de survie des jeunes cactus. Mais un parame\u0300tre a eu plus d&rsquo;effet que les autres: le taux d&rsquo;humidite\u0301 dans l&rsquo;air. Pourtant, les saguaros sont arme\u0301s pour re\u0301sister aux tempe\u0301ratures les plus extre\u0302mes.<\/p>\n<p><b>Un air de plus en plus sec dans le de\u0301sert<\/b><\/p>\n<p>Dans le sud de l&rsquo;Arizona, la tempe\u0301rature de\u0301passe re\u0301gulie\u0300rement les 40 \u00b0C et la pluie peut e\u0302tre absente pendante six a\u0300 huit mois. Mais la se\u0301cheresse de longue dure\u0301e qui affecte cette zone depuis 1994, avec des pics parfois extre\u0302mes, empe\u0302che les jeunes plantes de se de\u0301velopper. Les jeunes cactus n&rsquo;ont pas la possibilite\u0301 d&rsquo;absorber beaucoup d&rsquo;eau avec leurs racines, c&rsquo;est donc avec leur peau qu&rsquo;ils l&rsquo;absorbent: le taux d&rsquo;humidite\u0301 dans l&rsquo;air est donc tre\u0300s important. Or, l&rsquo;air du de\u0301sert ame\u0301ricain est de plus en plus sec, tre\u0300s souvent en dessous de 10 %.<\/p>\n<p>Il y a quelques anne\u0301es, une e\u0301tude avait permis de trouver seulement 70 saguaros de moins de 15 ans sur 10 000 comptabilise\u0301s.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Les cactus ge\u0301ants sont l\u2019emble\u0300me du de\u0301sert ame\u0301ricain. En Arizona, les saguaros, ces colosses verts he\u0301risse\u0301s d\u2019e\u0301pines peuvent atteindre 13 me\u0300tres de hauteur et vivre des centaines d\u2019anne\u0301es. Mais en se promenant dans ce de\u0301sert riche de ve\u0301ge\u0301taux en tous genres, un constat s\u2019impose: il est quasiment impossible de trouver de jeunes [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":65215,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-65216","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>La M\u00e9t\u00e9o Extr\u00eame du D\u00e9sert Am\u00e9ricain Menace les Cactus - Senegal<\/title>\n<meta name=\"description\" content=\"Les cactus ge\u0301ants sont l\u2019emble\u0300me du de\u0301sert ame\u0301ricain. 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