{"id":39136,"date":"2023-04-17T17:23:57","date_gmt":"2023-04-17T15:23:57","guid":{"rendered":"https:\/\/www.naturalscience.org\/?p=39136"},"modified":"2023-05-01T16:42:37","modified_gmt":"2023-05-01T14:42:37","slug":"le-secret-des-rivieres-volantes","status":"publish","type":"post","link":"https:\/\/www.naturalscience.org\/fr\/news\/2023\/04\/le-secret-des-rivieres-volantes\/","title":{"rendered":"Le secret des rivi\u00e8res volantes"},"content":{"rendered":"<p>Au milieu du 19\u00e8me si\u00e8cle, de nombreux paysans dans les \u00c9tats du centre des \u00c9tats-Unis ont d\u00fb faire face \u00e0 l\u2019\u00e9rosion. Pour contrer la perte de sol fertile due aux temp\u00eates, au vent et \u00e0 l\u2019eau, ils ont plant\u00e9 des arbres. Le politicien et fermier Julius Sterling Morton a \u00e9t\u00e9 l\u2019un des premiers \u00e0 reboiser syst\u00e9matiquement sa propri\u00e9t\u00e9. En tr\u00e8s peu de temps, l\u2019\u00e9rosion des sols a diminu\u00e9 et la biodiversit\u00e9 a augment\u00e9. Morton a alors demand\u00e9 l\u2019introduction d\u2019une&nbsp;\u00ab&nbsp;Journ\u00e9e de l\u2019Arbre&nbsp;\u00bb afin que tout le monde se souvienne toujours de ces performances consid\u00e9rables des arbres. En&nbsp;1872, la&nbsp;\u00ab&nbsp;Journ\u00e9e de l\u2019Arbre&nbsp;\u00bb a \u00e9t\u00e9 c\u00e9l\u00e9br\u00e9e pour la premi\u00e8re fois au Nebraska, puis 20&nbsp;ans plus tard dans toute l\u2019Am\u00e9rique. D\u00e9sormais, ce jour-l\u00e0, les arbres du monde entier sont honor\u00e9s et on plante des arbres.<\/p>\n<p>De nos jours, nous sommes conscients que les arbres font bien plus que simplement prot\u00e9ger contre l\u2019\u00e9rosion. Les arbres non seulement retiennent la terre avec leurs racines et sont reli\u00e9s entre eux par le r\u00e9seau racinaire, mais ils relient \u00e9galement chaque partie de la plan\u00e8te Terre. En fin de compte, leur vie est indissociablement li\u00e9e avec toute vie et donc aussi avec les \u00eatres humains. Car les arbres produisent de l\u2019oxyg\u00e8ne (gr\u00e2ce auquel chaque arbre maintient deux personnes en vie). Ils nous donnent du bois et des fruits, nous fournissent de l\u2019ombre par temps chaud, forment des habitats pour d\u2019innombrables animaux et plantes et ils r\u00e9gulent le climat ainsi que le cycle de l\u2019eau.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-39108 alignright\" src=\"https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_575016172small.-300x199.jpeg\" alt=\"\" width=\"300\" height=\"199\" srcset=\"https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_575016172small.-300x199.jpeg 300w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_575016172small.-1024x678.jpeg 1024w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_575016172small.-768x509.jpeg 768w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_575016172small.-1536x1017.jpeg 1536w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_575016172small.-2048x1357.jpeg 2048w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_575016172small.-164x109.jpeg 164w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_575016172small.-400x265.jpeg 400w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_575016172small.-500x331.jpeg 500w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>Quand on parle du cycle de l\u2019eau, on pense g\u00e9n\u00e9ralement au&nbsp;\u00ab&nbsp;grand cycle de l\u2019eau&nbsp;\u00bb&nbsp;: l\u2019eau s\u2019\u00e9vapore au-dessus des mers, s\u2019\u00e9l\u00e8ve, se condense en nuages, est transport\u00e9e par les vents au-dessus du continent, y tombe et retourne finalement dans la mer par les rivi\u00e8res. Ce cycle fonctionnerait th\u00e9oriquement sans arbres. Mais il y a aussi le&nbsp;\u00ab&nbsp;petit cycle de l\u2019eau&nbsp;\u00bb qui, malgr\u00e9 son nom, transporte des masses d\u2019eau gigantesques sur des dizaines de milliers de kilom\u00e8tres au-dessus des terres. Ce cycle de l\u2019eau d\u00e9pend enti\u00e8rement des arbres et des for\u00eats.<\/p>\n<p>Tout commence avec un seul arbre qui \u00e9vapore en moyenne 400 litres d\u2019eau par jour.<span class=\"footnote_referrer\"><a role=\"button\" tabindex=\"0\" onclick=\"footnote_moveToReference_39136_1('footnote_plugin_reference_39136_1_1');\" onkeypress=\"footnote_moveToReference_39136_1('footnote_plugin_reference_39136_1_1');\" ><sup id=\"footnote_plugin_tooltip_39136_1_1\" class=\"footnote_plugin_tooltip_text\">1)<\/sup><\/a><span id=\"footnote_plugin_tooltip_text_39136_1_1\" class=\"footnote_tooltip\">Pokorny (2019): Evapotranspiration. In: Encyclopedia of Ecology, Elsevier pp. 292-303<\/span><\/span><script type=\"text\/javascript\"> jQuery('#footnote_plugin_tooltip_39136_1_1').tooltip({ tip: '#footnote_plugin_tooltip_text_39136_1_1', tipClass: 'footnote_tooltip', effect: 'fade', predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: 'top right', relative: true, offset: [10, 10], });<\/script> Il le fait surtout gr\u00e2ce \u00e0 ses nombreuses feuilles qui forment ensemble d\u2019immenses surfaces \u00e0 travers lesquelles et sur lesquelles l\u2019eau s\u2019\u00e9vapore constamment. Il ne s\u2019agit pas seulement de l\u2019eau que l\u2019arbre puise en m\u00eame temps que les nutriments dans les eaux souterraines avec ses racines, mais aussi de l\u2019eau de pluie, rest\u00e9e sur ses feuilles, qui s\u2019en \u00e9vapore. L\u2019eau monte et se condense en formant des nuages&nbsp;; elle est ensuite transport\u00e9e par les vents jusqu\u2019\u00e0 ce qu\u2019elle retombe en pluie, la plupart \u00e9tant r\u00e9cup\u00e9r\u00e9e par les arbres avant de s\u2019\u00e9vaporer \u00e0 nouveau. La majeure partie de la pluie est rendue sans cesse au petit cycle de l\u2019eau. En moyenne, l\u2019eau est transport\u00e9e dans les nuages sur environ 2&nbsp;000&nbsp;kilom\u00e8tres jusqu\u2019\u00e0 ce qu\u2019il pleuve et que le cycle recommence, transportant l\u2019eau \u00e0 travers les continents, comme une&nbsp;\u00ab&nbsp;rivi\u00e8re volante&nbsp;\u00bb. Ce sont donc les for\u00eats, et donc chaque arbre, qui cr\u00e9ent le petit cycle de l\u2019eau et assurent une r\u00e9partition \u00e9gale de l\u2019eau sur la plan\u00e8te. Les arbres aident la plan\u00e8te \u00e0 rester en \u00e9quilibre et fournissent des conditions similaires \u00e0 tout \u00eatre vivant, au moins en ce qui concerne l\u2019eau.<\/p>\n<p>Il y a toujours la m\u00eame quantit\u00e9 d\u2019eau sur Terre. L\u2019aridit\u00e9 et les s\u00e9cheresses ne se produisent que lorsque les rivi\u00e8res volantes cessent de couler et que l\u2019eau n\u2019est plus r\u00e9partie uniform\u00e9ment. Au cours des derni\u00e8res ann\u00e9es, la conversion des for\u00eats en terres agricoles ou en habitations ainsi qu\u2019une d\u00e9forestation croissante \u00e0 des fins lucratives, ont entra\u00een\u00e9, sur l\u2019ensemble de la plan\u00e8te, une diminution annuelle d\u2019environ 5&nbsp;% de l\u2019\u00e9vaporation d\u2019eau de la surface terrestre, ce qui a r\u00e9duit \u00e9galement le transport de l\u2019eau par les rivi\u00e8res volantes.<\/p>\n<p>Les fleuves volants ne sont qu\u2019un exemple parmi d\u2019autres dans la nature, montrant comment toute vie est li\u00e9e. Les pluies en Chine proviennent \u00e0 80&nbsp;% des for\u00eats europ\u00e9ennes et l\u2019eau est transport\u00e9e jusqu\u2019en Chine via les for\u00eats russes. De m\u00eame, 70&nbsp;% des pr\u00e9cipitations dans les r\u00e9gions m\u00e9ridionales de l\u2019Am\u00e9rique du Sud proviennent de l\u2019Amazonie, et l\u2019Am\u00e9rique du Nord d\u00e9pend \u00e9galement de la for\u00eat tropicale d\u2019Am\u00e9rique du Sud.<span class=\"footnote_referrer\"><a role=\"button\" tabindex=\"0\" onclick=\"footnote_moveToReference_39136_1('footnote_plugin_reference_39136_1_2');\" onkeypress=\"footnote_moveToReference_39136_1('footnote_plugin_reference_39136_1_2');\" ><sup id=\"footnote_plugin_tooltip_39136_1_2\" class=\"footnote_plugin_tooltip_text\">2)<\/sup><\/a><span id=\"footnote_plugin_tooltip_text_39136_1_2\" class=\"footnote_tooltip\">Makarieva &amp; Gorshkov (2020): A controversial Russian theory claims forests don&rsquo;t just make rain-they make wind. The Biotic Pump Greening Group<\/span><\/span><script type=\"text\/javascript\"> jQuery('#footnote_plugin_tooltip_39136_1_2').tooltip({ tip: '#footnote_plugin_tooltip_text_39136_1_2', tipClass: 'footnote_tooltip', effect: 'fade', predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: 'top right', relative: true, offset: [10, 10], });<\/script> Dans le nord-ouest des \u00c9tats-Unis, il est prouv\u00e9 qu\u2019il y a d\u00e9j\u00e0 jusqu\u2019\u00e0 20&nbsp;% de pr\u00e9cipitations en moins en \u00e9t\u00e9 et seulement la moiti\u00e9 de la neige en hiver en raison de la d\u00e9forestation de la for\u00eat tropicale amazonienne.<span class=\"footnote_referrer\"><a role=\"button\" tabindex=\"0\" onclick=\"footnote_moveToReference_39136_1('footnote_plugin_reference_39136_1_3');\" onkeypress=\"footnote_moveToReference_39136_1('footnote_plugin_reference_39136_1_3');\" ><sup id=\"footnote_plugin_tooltip_39136_1_3\" class=\"footnote_plugin_tooltip_text\">3)<\/sup><\/a><span id=\"footnote_plugin_tooltip_text_39136_1_3\" class=\"footnote_tooltip\">Medvigy, Walko, Otte &amp; Avissar (2013). Simulated Changes in Northwest U.S. Climate in Response to Amazon Deforestation, Journal of Climate, 26(22), 9115-9136.<\/span><\/span><script type=\"text\/javascript\"> jQuery('#footnote_plugin_tooltip_39136_1_3').tooltip({ tip: '#footnote_plugin_tooltip_text_39136_1_3', tipClass: 'footnote_tooltip', effect: 'fade', predelay: 0, fadeInSpeed: 200, delay: 400, fadeOutSpeed: 200, position: 'top right', relative: true, offset: [10, 10], });<\/script><\/p>\n<div id=\"attachment_39112\" style=\"width: 400px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-39112\" class=\"wp-image-39112 size-size-400\" src=\"https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_420333662_small-400x267.jpeg\" alt=\"\" width=\"400\" height=\"267\" srcset=\"https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_420333662_small-400x267.jpeg 400w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_420333662_small-300x200.jpeg 300w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_420333662_small-1024x683.jpeg 1024w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_420333662_small-768x512.jpeg 768w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_420333662_small-1536x1024.jpeg 1536w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_420333662_small-2048x1365.jpeg 2048w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_420333662_small-164x109.jpeg 164w, https:\/\/www.naturalscience.org\/wp-content\/uploads\/2023\/03\/AdobeStock_420333662_small-500x333.jpeg 500w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><p id=\"caption-attachment-39112\" class=\"wp-caption-text\">&nbsp;<\/p><\/div>\n<p>Chaque goutte d\u2019eau nous revient par les cycles de l\u2019eau. Les nations de cette Terre sont reli\u00e9es entre elles par les fleuves volants, car la nature ne conna\u00eet pas de fronti\u00e8res. Nous aussi, les \u00eatres humains, devons \u0153uvrer ensemble et reconna\u00eetre que, d\u2019une mani\u00e8re ou d\u2019une autre, nous sommes tous li\u00e9s et interd\u00e9pendants. En plantant un arbre en Europe, nous aidons d\u2019abord nos concitoyens chinois \u00e0 obtenir de l\u2019eau potable fra\u00eeche. Mais le cycle continue et l\u2019eau en Chine, \u00e0 l\u2019origine europ\u00e9enne, sera t\u00f4t ou tard de nouveau n\u00e9cessaire en Europe et, apr\u00e8s un long voyage, elle y retombera sous forme de pluie. Si nous voulons que tous les peuples de cette plan\u00e8te et nous-m\u00eames ayons suffisamment d\u2019eau douce, nous devons pr\u00e9server les for\u00eats de cette Terre et reboiser les anciennes for\u00eats. Puisque nous avons r\u00e9ussi \u00e0 entraver les cycles naturels comme les rivi\u00e8res volantes, nous avons \u00e9galement la force et la capacit\u00e9 de restaurer ces cycles en replantant plus d\u2019arbres.<\/p>\n<p>Prenons conscience de notre responsabilit\u00e9 envers la plan\u00e8te et reconnaissons que chaque arbre compte et apporte une contribution importante \u00e0 toute la plan\u00e8te. Faites quelque chose de bien, non seulement pour la nature et le climat, mais aussi pour votre prochain et pour vous-m\u00eame, et plantez un arbre le Jour de l\u2019Arbre, vendredi&nbsp;28&nbsp;avril&nbsp;2023&#8230; ou m\u00eame deux ou trois!<\/p>\n<p>&nbsp;<\/p>\n<div class=\"speaker-mute footnotes_reference_container\"> <div class=\"footnote_container_prepare\"><p><span role=\"button\" tabindex=\"0\" class=\"footnote_reference_container_label pointer\" onclick=\"footnote_expand_collapse_reference_container_39136_1();\">References<\/span><span role=\"button\" tabindex=\"0\" class=\"footnote_reference_container_collapse_button\" style=\"display: none;\" onclick=\"footnote_expand_collapse_reference_container_39136_1();\">[<a id=\"footnote_reference_container_collapse_button_39136_1\">+<\/a>]<\/span><\/p><\/div> <div id=\"footnote_references_container_39136_1\" style=\"\"><table class=\"footnotes_table footnote-reference-container\"><caption class=\"accessibility\">References<\/caption> <tbody> \r\n\r\n<tr class=\"footnotes_plugin_reference_row\"> <th scope=\"row\" class=\"footnote_plugin_index_combi pointer\"  onclick=\"footnote_moveToAnchor_39136_1('footnote_plugin_tooltip_39136_1_1');\"><a id=\"footnote_plugin_reference_39136_1_1\" class=\"footnote_backlink\"><span class=\"footnote_index_arrow\">&#8593;<\/span>1<\/a><\/th> <td class=\"footnote_plugin_text\">Pokorny (2019): Evapotranspiration. In: Encyclopedia of Ecology, Elsevier pp. 292-303<\/td><\/tr>\r\n\r\n<tr class=\"footnotes_plugin_reference_row\"> <th scope=\"row\" class=\"footnote_plugin_index_combi pointer\"  onclick=\"footnote_moveToAnchor_39136_1('footnote_plugin_tooltip_39136_1_2');\"><a id=\"footnote_plugin_reference_39136_1_2\" class=\"footnote_backlink\"><span class=\"footnote_index_arrow\">&#8593;<\/span>2<\/a><\/th> <td class=\"footnote_plugin_text\">Makarieva &amp; Gorshkov (2020): A controversial Russian theory claims forests don&rsquo;t just make rain-they make wind. The Biotic Pump Greening Group<\/td><\/tr>\r\n\r\n<tr class=\"footnotes_plugin_reference_row\"> <th scope=\"row\" class=\"footnote_plugin_index_combi pointer\"  onclick=\"footnote_moveToAnchor_39136_1('footnote_plugin_tooltip_39136_1_3');\"><a id=\"footnote_plugin_reference_39136_1_3\" class=\"footnote_backlink\"><span class=\"footnote_index_arrow\">&#8593;<\/span>3<\/a><\/th> <td class=\"footnote_plugin_text\">Medvigy, Walko, Otte &amp; Avissar (2013). Simulated Changes in Northwest U.S. Climate in Response to Amazon Deforestation, Journal of Climate, 26(22), 9115-9136.<\/td><\/tr>\r\n\r\n <\/tbody> <\/table> <\/div><\/div><script type=\"text\/javascript\"> function footnote_expand_reference_container_39136_1() { jQuery('#footnote_references_container_39136_1').show(); jQuery('#footnote_reference_container_collapse_button_39136_1').text('\u2212'); } function footnote_collapse_reference_container_39136_1() { jQuery('#footnote_references_container_39136_1').hide(); jQuery('#footnote_reference_container_collapse_button_39136_1').text('+'); } function footnote_expand_collapse_reference_container_39136_1() { if (jQuery('#footnote_references_container_39136_1').is(':hidden')) { footnote_expand_reference_container_39136_1(); } else { footnote_collapse_reference_container_39136_1(); } } function footnote_moveToReference_39136_1(p_str_TargetID) { footnote_expand_reference_container_39136_1(); var l_obj_Target = jQuery('#' + p_str_TargetID); if (l_obj_Target.length) { jQuery( 'html, body' ).delay( 0 ); jQuery('html, body').animate({ scrollTop: l_obj_Target.offset().top - window.innerHeight * 0.2 }, 380); } } function footnote_moveToAnchor_39136_1(p_str_TargetID) { footnote_expand_reference_container_39136_1(); var l_obj_Target = jQuery('#' + p_str_TargetID); if (l_obj_Target.length) { jQuery( 'html, body' ).delay( 0 ); jQuery('html, body').animate({ scrollTop: l_obj_Target.offset().top - window.innerHeight * 0.2 }, 380); } }<\/script>","protected":false},"excerpt":{"rendered":"Au milieu du 19\u00e8me si\u00e8cle, de nombreux paysans dans les \u00c9tats du centre des \u00c9tats-Unis ont d\u00fb faire face \u00e0 l\u2019\u00e9rosion. Pour contrer la perte de sol fertile due aux temp\u00eates, au vent et \u00e0 l\u2019eau, ils ont plant\u00e9 des arbres. Le politicien et fermier Julius Sterling Morton a \u00e9t\u00e9 l\u2019un des premiers \u00e0 reboiser [&hellip;]","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[214,212],"tags":[],"class_list":["post-39136","post","type-post","status-publish","format-standard","hentry","category-forets","category-agriculture-naturelle","wpautop"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le secret des rivi\u00e8res volantes - The World Foundation for Natural Science<\/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:\/\/www.naturalscience.org\/fr\/news\/2023\/04\/le-secret-des-rivieres-volantes\/\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Monika Waldmann\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.naturalscience.org\\\/fr\\\/news\\\/2023\\\/04\\\/le-secret-des-rivieres-volantes\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.naturalscience.org\\\/fr\\\/news\\\/2023\\\/04\\\/le-secret-des-rivieres-volantes\\\/\"},\"author\":{\"name\":\"Monika Waldmann\",\"@id\":\"https:\\\/\\\/www.naturalscience.org\\\/#\\\/schema\\\/person\\\/f3e16bb7057b29f8593016bf70a42022\"},\"headline\":\"Le secret des rivi\u00e8res volantes\",\"datePublished\":\"2023-04-17T15:23:57+00:00\",\"dateModified\":\"2023-05-01T14:42:37+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.naturalscience.org\\\/fr\\\/news\\\/2023\\\/04\\\/le-secret-des-rivieres-volantes\\\/\"},\"wordCount\":1192,\"image\":{\"@id\":\"https:\\\/\\\/www.naturalscience.org\\\/fr\\\/news\\\/2023\\\/04\\\/le-secret-des-rivieres-volantes\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.naturalscience.org\\\/wp-content\\\/uploads\\\/2023\\\/03\\\/AdobeStock_575016172small.-300x199.jpeg\",\"articleSection\":[\"For\u00eats\",\"Agriculture naturelle\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.naturalscience.org\\\/fr\\\/news\\\/2023\\\/04\\\/le-secret-des-rivieres-volantes\\\/\",\"url\":\"https:\\\/\\\/www.naturalscience.org\\\/fr\\\/news\\\/2023\\\/04\\\/le-secret-des-rivieres-volantes\\\/\",\"name\":\"Le secret des rivi\u00e8res volantes - 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