{"id":514,"date":"2011-09-06T23:00:00","date_gmt":"2011-09-06T22:00:00","guid":{"rendered":"http:\/\/www.laterredufutur.com\/wordpress\/?p=514"},"modified":"2015-04-22T21:13:40","modified_gmt":"2015-04-22T19:13:40","slug":"le-sahara-reverdit-iii","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/le-sahara-reverdit-iii\/","title":{"rendered":"Le Sahara reverdit III"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>Depuis 2004, nous constations un reverdissement du sahel \u00e0 contrario de tous les dires m\u00e9diatiques. Ainsi certains scientifiques nous apportaient \u00e0 l&rsquo;\u00e9poque cette recherche : \u00ab\u00a0Le Sahel reverdit ! Ce n&rsquo;est pas une incantation, mais une tendance bel et bien observ\u00e9e par des chercheurs qui ont d\u00e9pouill\u00e9 quinze ans de photographies satellites de la r\u00e9gion. Ces g\u00e9ographes europ\u00e9ens affirment que les terres cultivables commencent \u00e0 reprendre progressivement du terrain. Une bonne nouvelle ! D\u00e9cid\u00e9ment le changement climatique ne ressemble \u00e0 aucun sc\u00e9nario pr\u00e9vu&#8230;\u00a0\u00bb. En 2010, la situation se confirme. Aujourd&rsquo;hui, en voici les explications&#8230;<\/p>\n<h4 style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\"><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"512\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/au-maroc-le-desert-reverdit-peu-a-peu\/sahel-reverdissement\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement.jpg?fit=370%2C284&amp;ssl=1\" data-orig-size=\"370,284\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"sahel-reverdissement\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement.jpg?fit=300%2C230&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement.jpg?fit=370%2C284&amp;ssl=1\" class=\" alignleft size-full wp-image-512\" style=\"float: left;\" title=\"sahel reverdissement\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/wordpress\/wp-content\/uploads\/2011\/09\/sahel-reverdissement.jpg?w=120\" alt=\"sahel reverdissement\"  border=\"0\" \/><\/span><\/span><\/h4>\n<p>Dans le bassin-versant du Bani, au Mali, on observe par t\u00e9l\u00e9d\u00e9tection une tendance \u00e0 l\u2019augmentation de l\u2019indice de v\u00e9g\u00e9tation sur les vingt-cinq derni\u00e8res ann\u00e9es. Ce verdissement, constat\u00e9 dans la plupart des \u00e9tudes men\u00e9es en Afrique de l\u2019Ouest, ne s\u2019accompagne pas d\u2019une augmentation significative de la pluviom\u00e9trie. Comment expliquer cette tendance ? Selon une \u00e9quipe du Cirad, elle pourrait r\u00e9sulter de la dynamique de la v\u00e9g\u00e9tation naturelle et non d\u2019un changement dans l\u2019utilisation des sols comme cela est souvent mis en avant.<\/p>\n<p>Dans le bassin-versant du Bani, qui s\u2019\u00e9tend sur 130 000 kilom\u00e8tres carr\u00e9s au Mali, une \u00e9quipe du Cirad et ses partenaires ont suivi la dynamique de la v\u00e9g\u00e9tation de 1982 \u00e0 2006 afin de comprendre les causes du verdissement du Sahel. Ce suivi a \u00e9t\u00e9 r\u00e9alis\u00e9 en examinant des s\u00e9ries d\u2019images d\u2019indice de v\u00e9g\u00e9tation satellitaire (NDVI, normalized difference vegetation index), un bon indicateur de l\u2019activit\u00e9 photosynth\u00e9tique des surfaces. L\u2019\u00e9volution de cet indice est analys\u00e9e en fonction de la pluviom\u00e9trie et des changements d\u2019occupation du sol, les deux principaux d\u00e9terminants de la dynamique de la v\u00e9g\u00e9tation dans la r\u00e9gion soudano-sah\u00e9lienne.<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p>Sur la p\u00e9riode 1982-2006, aucune \u00e9volution de la pluviom\u00e9trie annuelle n\u2019a \u00e9t\u00e9 mise en \u00e9vidence \u00e0 l\u2019\u00e9chelle du bassin-versant. En revanche, on observe une augmentation des surfaces cultiv\u00e9es, qui passent de 13 % \u00e0 23 % entre 1985 et 2000. L\u2019analyse de ces r\u00e9sultats n\u2019a cependant pas permis de trouver un lien univoque entre le verdissement du bassin et les changements d\u2019occupation du sol.<br \/>\n<script src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\" async=\"\"><\/script><!-- TDF2 --> <ins class=\"adsbygoogle\" style=\"display: inline-block; width: 336px; height: 280px;\" data-ad-client=\"ca-pub-2860849627502538\" data-ad-slot=\"1340140919\"><\/ins><script>\/\/ < ![CDATA[\n(adsbygoogle = window.adsbygoogle || []).push({});\n\/\/ ]]><\/script><\/p>\n<p style=\"text-align: justify;\"><img data-recalc-dims=\"1\" decoding=\"async\" data-attachment-id=\"513\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/le-sahara-reverdit-iii\/sahel-reverdissement-1\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement-1.jpg?fit=498%2C171&amp;ssl=1\" data-orig-size=\"498,171\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"sahel-reverdissement-1\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement-1.jpg?fit=300%2C103&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement-1.jpg?fit=498%2C171&amp;ssl=1\" class=\" size-full wp-image-513\" title=\"sahel reverdissement\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/wordpress\/wp-content\/uploads\/2011\/09\/sahel-reverdissement-1.jpg?w=450\" alt=\"sahel reverdissement\"  border=\"0\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">Le d\u00e9veloppement des cultures n\u2019expliquerait le verdissement que dans le nord du Bani, en zone sah\u00e9lienne, o\u00f9 les cultures pr\u00e9sentent un indice de v\u00e9g\u00e9tation sup\u00e9rieur \u00e0 celui de la v\u00e9g\u00e9tation naturelle. Le verdissement dans le bassin-versant serait donc essentiellement li\u00e9 \u00e0 la dynamique de la v\u00e9g\u00e9tation naturelle.<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">Cette dynamique d\u00e9pendrait, en fait, de la distribution des pluies au cours des vingt-cinq derni\u00e8res ann\u00e9es et non de leurs tendances. En effet, si les pluies sont devenues d\u00e9ficitaires de 2000 \u00e0 2006, elles avaient augment\u00e9 de 1982 \u00e0 1999. Les plantes p\u00e9rennes ont pu profiter de cette augmentation et rester vivaces pendant la p\u00e9riode s\u00e8che qui a suivi.<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">Cette \u00e9tude d\u00e9montre les limites des analyses de tendance en t\u00e9l\u00e9d\u00e9tection et climatologie fond\u00e9es sur des relations lin\u00e9aires, qui sont des mod\u00e8les trop simplistes pour reproduire correctement les ph\u00e9nom\u00e8nes \u00e9cologiques et g\u00e9ographiques en jeu.<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\">source : <a href=\"http:\/\/www.cirad.fr\/\">http:\/\/www.cirad.fr\/<\/a><\/span><\/span><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"514\">(766)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\"><img decoding=\"async\" class=\" alignleft size-full wp-image-512\" src=\"http:\/\/www.laterredufutur.com\/wordpress\/wp-content\/uploads\/2011\/09\/sahel-reverdissement.jpg\" border=\"0\" alt=\"sahel reverdissement\" title=\"sahel reverdissement\" width=\"120\" style=\"float: left;\" \/>Depuis 2004, nous constations un reverdissement du sahel \u00e0 contrario de tous les dires m\u00e9diatiques. Ainsi certains scientifiques nous apportaient \u00e0 l&rsquo;\u00e9poque cette recherche : \u00ab\u00a0<span style=\"font-size: x-small;\">Le Sahel reverdit\u00a0! Ce n&rsquo;est pas une incantation, mais une tendance bel et bien observ\u00e9e par des chercheurs qui ont d\u00e9pouill\u00e9 quinze ans de photographies satellites de la r\u00e9gion. Ces g\u00e9ographes europ\u00e9ens affirment que les terres cultivables commencent \u00e0 reprendre progressivement du terrain. Une bonne nouvelle\u00a0!<\/span> D\u00e9cid\u00e9ment le changement climatique ne ressemble \u00e0 aucun sc\u00e9nario pr\u00e9vu&#8230;\u00a0\u00bb, <a href=\"..\/html\/modules.php?name=News&amp;file=article&amp;sid=22\">\u00e0 voir ICI<\/a>.\u00a0En 2010, la situation se confirme \u00e0 relire <a href=\"..\/html\/modules.php?name=News&amp;file=article&amp;sid=1076\">ICI<\/a>. Aujourd&rsquo;hui, en voici les explications&#8230;<\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\"> <\/span><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-size: small;\"> <\/span><\/span><\/p>\n","protected":false},"author":1,"featured_media":512,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[27],"tags":[640,639,641,62,192,638,636,637,642],"class_list":["post-514","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ecologie","tag-bani","tag-culture","tag-mali","tag-pluie","tag-pluviometrie","tag-reverdit","tag-sahara","tag-sahel","tag-verdissement","wpcat-27-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2011\/09\/sahel-reverdissement.jpg?fit=370%2C284&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-8i","jetpack-related-posts":[{"id":12201,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-deserts-africains-reverdissent\/","url_meta":{"origin":514,"position":0},"title":"Les d\u00e9serts africains reverdissent","author":"Admin","date":"12 mai 2016","format":false,"excerpt":"Une nouvelle \u00e9tude de l'Arizona State University a confirm\u00e9 que les d\u00e9serts Africains reverdissaient. Comme cela a \u00e9t\u00e9\u00a0rapport\u00e9 en septembre 2015 par\u00a0Breitbart, contrairement \u00e0 tout ce que les alarmistes nous ont dit, les d\u00e9serts de l' Afrique connaissent un\u00a0\u00abreverdissement\u00bb de fa\u00e7on constante depuis les s\u00e9cheresses des ann\u00e9es 1970 et 1980\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/elephant-verdure.jpg?fit=640%2C427&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/elephant-verdure.jpg?fit=640%2C427&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/elephant-verdure.jpg?fit=640%2C427&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":16170,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-sahel-reverdit\/","url_meta":{"origin":514,"position":1},"title":"Le Sahel reverdit","author":"Admin","date":"10 janvier 2018","format":false,"excerpt":"Selon une \u00e9tude publi\u00e9e en juin 2015 dans la revue Nature Climate Change [1] le Sahel reverdit gr\u00e2ce \u00e0 une pluviosit\u00e9 en augmentation depuis les ann\u00e9es 80. La pluviom\u00e9trie \u00e0 l\u2019origine de ce verdissement Il y a un consensus sur le fait que le Sahel gagne en couverture v\u00e9g\u00e9tale par\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/Sahel_forest_near_Kayes_Mali.jpg?fit=1200%2C900&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/Sahel_forest_near_Kayes_Mali.jpg?fit=1200%2C900&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/Sahel_forest_near_Kayes_Mali.jpg?fit=1200%2C900&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/Sahel_forest_near_Kayes_Mali.jpg?fit=1200%2C900&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/Sahel_forest_near_Kayes_Mali.jpg?fit=1200%2C900&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":908,"url":"https:\/\/www.laterredufutur.com\/accueil\/lafrique-reverdit-iv\/","url_meta":{"origin":514,"position":2},"title":"L&rsquo;Afrique reverdit IV","author":"Admin","date":"27 mai 2012","format":false,"excerpt":"Depuis 2004, o\u00f9 nous avions vu que sur la Terre du Futur, des indices nous d\u00e9montraient un reverdissement de l'Afrique, voici qu'au-del\u00e0 des catastrophes naturelles attribu\u00e9es au r\u00e9chauffement climatique se profile une inexorable fatalit\u00e9 faite de d\u00e9sertification, de s\u00e9cheresse, de pauvret\u00e9 et de mort. Mais il se pourrait que ce\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"pluie afrique","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2012\/05\/pluie-afrique.jpg?fit=940%2C705&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":2628,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-sahara-reverdit\/","url_meta":{"origin":514,"position":3},"title":"Le Sahara reverdit","author":"Admin","date":"27 d\u00e9cembre 2004","format":false,"excerpt":"Le Sahel reverdit\u00a0! Ce n'est pas une incantation, mais une tendance bel et bien observ\u00e9e par des chercheurs qui ont d\u00e9pouill\u00e9 quinze ans de photographies satellites de la r\u00e9gion. Ces g\u00e9ographes europ\u00e9ens affirment que les terres cultivables commencent \u00e0 reprendre progressivement du terrain. Une bonne nouvelle\u00a0! D\u00e9cid\u00e9ment le changement climatique\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/maro0588.jpeg?fit=512%2C341&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":7742,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-grande-muraille-verte-du-sahara-pour-reverdir-le-sahara\/","url_meta":{"origin":514,"position":4},"title":"La Grande muraille verte du Sahara pour reverdir le Sahara","author":"Admin","date":"6 ao\u00fbt 2015","format":false,"excerpt":"A l'heure o\u00f9 l'on parle de la plan\u00e8te Mars, voire de la terraformer, il serait bon de se poser les vraies questions pour notre propre plan\u00e8te. 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