{"id":3679,"date":"2024-06-19T12:22:54","date_gmt":"2024-06-19T10:22:54","guid":{"rendered":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/?p=3679"},"modified":"2024-09-18T10:42:25","modified_gmt":"2024-09-18T08:42:25","slug":"plantes-sol-eau-et-climat","status":"publish","type":"post","link":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/plantes-sol-eau-et-climat\/","title":{"rendered":"Plantes, sol, eau et climat"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Travailler avec les plantes, le sol et l&rsquo;eau pour refroidir le climat<\/h1>\n\n\n\n<p class=\"has-medium-font-size\">D\u00e9couvrez l&rsquo;importance des plantes et du sol dans le cycle de l&rsquo;eau et la r\u00e9gulation du climat. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">La destruction continue des for\u00eats, la d\u00e9t\u00e9rioration des sols, la perte subs\u00e9quente du stockage de l\u2018eau dans les sols et la r\u00e9duction de la r\u00e9tention d\u2018eau dans les espaces naturels perturbent la circulation de l\u2018eau dans et \u00e0 travers l\u2018atmosph\u00e8re. <strong>Cette perturbation provoque des changements majeurs dans les pr\u00e9cipitations et une aggravation du changement climatique.<\/strong> Ces changements affectent le climat \u00e0 l\u2018\u00e9chelle d\u2018une r\u00e9gion, mais peuvent \u00e9galement avoir un impact sur des r\u00e9gions tr\u00e8s \u00e9loign\u00e9es.\u00a0<\/p>\n\n\n\n<p class=\"has-text-align-justify\">La v\u00e9g\u00e9tation joue un r\u00f4le important &#8211; et souvent n\u00e9glig\u00e9 &#8211; dans la r\u00e9gulation du climat. En effet, dans les sols, les cycles du carbone, de l\u2018eau et de l\u2018\u00e9nergie sont intimement li\u00e9s. Ainsi, <strong>le r\u00e9tablissement des cycles d\u2018humidit\u00e9 atmosph\u00e9rique et terrestre sur la v\u00e9g\u00e9tation, dans les sols et dans l\u2018atmosph\u00e8re est de la plus haute importance pour refroidir la plan\u00e8te et s\u00e9curiser les r\u00e9gimes de pr\u00e9cipitation dans le monde.\u00a0<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">L\u2019arr\u00eat de la d\u00e9forestation et l\u2018augmentation de la reforestation sont obligatoires. La mise en \u0153uvre de l\u2018agroforesterie repr\u00e9sente une autre approche importante pour alimenter les cycles de l\u2018eau et de l\u2018\u00e9nergie. Toutefois, il est indispensable en parall\u00e8le d\u2019augmenter la fertilit\u00e9 des sols, la r\u00e9tention d\u2018eau et la protection des sols par les pratiques de l\u2018agriculture r\u00e9g\u00e9n\u00e9rative ou de conservation. Ainsi, trouver des moyens de renforcer la mati\u00e8re organique du sol est l\u2018une des cl\u00e9s du succ\u00e8s pour les grandes r\u00e9gions du monde actuellement cultiv\u00e9es. <strong>Il faut \u00e9galement changer de paradigme, en valorisant les effets hydrologiques et de refroidissement du climat par la v\u00e9g\u00e9tation, parall\u00e8lement \u00e0 leur potentiel de pi\u00e9geage du carbone.\u00a0<\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Des relations primordiales entre les plantes, les sols, l\u2019eau pour la r\u00e9gulation du climat<\/strong><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Plus de 70% du rayonnement utilis\u00e9 pour la transpiration des plantes<\/strong><\/h3>\n\n\n\n<p class=\"has-text-align-justify\">Le rayonnement solaire qui atteint la surface d\u2018un champ \u00e0 v\u00e9g\u00e9tation dense n\u2019est utilis\u00e9 qu\u2019\u00e0 raison de 1 % pour la photosynth\u00e8se. Et de 5 \u00e0 10 % pour chauffer l\u2019air (\u00ab chaleur sensible \u00bb ). Ainsi, en comptant les surfaces non v\u00e9g\u00e9talis\u00e9es et les surfaces aquatiques, <strong>environ 50 % de l\u2019\u00e9nergie solaire qui atteint le sol est utilis\u00e9e pour l\u2018\u00e9vaporation et la transpiration de l\u2019eau (\u00ab \u00e9vapotranspiration \u00bb)<\/strong>. Toutes ces masses d\u2019air s\u2019\u00e9l\u00e8vent dans l\u2019atmosph\u00e8re. La vapeur d\u2019eau va finalement se condenser. Et restituer la m\u00eame quantit\u00e9 d\u2019\u00e9nergie que celle qui a \u00e9t\u00e9 consomm\u00e9e au niveau du sol. Et une partie en sera dissip\u00e9e dans l\u2019espace. Les nuages nouvellement cr\u00e9\u00e9s vont alors r\u00e9fl\u00e9chir le rayonnement solaire incident et seront la source de nouvelles pr\u00e9cipitations.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>L\u2018\u00e9vapotranspiration des plantes, source de pr\u00e9cipitations<\/strong><\/h3>\n\n\n\n<p class=\"has-text-align-justify\"><\/p>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img data-recalc-dims=\"1\" fetchpriority=\"high\" decoding=\"async\" width=\"758\" height=\"308\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/Taux-de-recyclage-des-precipitations.png?resize=758%2C308&#038;ssl=1\" alt=\"\" class=\"wp-image-3681 size-full\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/Taux-de-recyclage-des-precipitations.png?w=758&amp;ssl=1 758w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/Taux-de-recyclage-des-precipitations.png?resize=300%2C122&amp;ssl=1 300w\" sizes=\"(max-width: 758px) 100vw, 758px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p>\u00c0 l\u2018\u00e9chelle mondiale,<strong> 40 \u00e0 60 % de la pluie tombant sur terre provient de l\u2018humidit\u00e9 g\u00e9n\u00e9r\u00e9e par l\u2018\u00e9vapotranspiration terrestre<\/strong>. C&rsquo;est principalement par la transpiration des arbres, et transport\u00e9e par les vents. Dans certaines r\u00e9gions du monde, cette part s\u2018\u00e9l\u00e8ve \u00e0 70 % des pr\u00e9cipitations. Ce recyclage devient plus dominant \u00e0 l\u2018int\u00e9rieur des terres.\u00a0<\/p>\n<\/div><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Un impact fort de l\u2019activit\u00e9 humaine sur les relations plantes, sols, eau et climat<\/strong><\/h3>\n\n\n\n<p class=\"has-text-align-justify\">Jusqu\u2018\u00e0 r\u00e9cemment, l\u2018impact de l\u2019homme sur la vapeur d\u2019eau dans l\u2018atmosph\u00e8re \u00e9tait consid\u00e9r\u00e9 comme n\u00e9gligeable par rapport \u00e0 l\u2018\u00e9vaporation des oc\u00e9ans. Toutefois, cet impact est d\u00fb \u00e0 d\u2018importants changements de la couverture des sols d\u2019origine anthropique, et pas seulement aux \u00e9missions industrielles.<\/p>\n\n\n\n<div class=\"wp-block-media-text has-media-on-the-right is-stacked-on-mobile\" style=\"grid-template-columns:auto 36%\"><div class=\"wp-block-media-text__content\">\n<p><strong>L\u2019utilisation accrue des terres par l\u2018homme a entra\u00een\u00e9 une r\u00e9duction de la couverture v\u00e9g\u00e9tale, une d\u00e9gradation des sols et une diminution de la r\u00e9tention d\u2018eau.<\/strong> Cela r\u00e9duit directement l\u2018\u00e9vapotranspiration, augmentant les temp\u00e9ratures au sol, ce qui a un impact sur l\u2018augmentation de la temp\u00e9rature mondiale.\u00a0<\/p>\n\n\n\n<p><strong>L\u2019augmentation de la v\u00e9g\u00e9tation<\/strong> sur les terres accro\u00eet la fertilit\u00e9 des sols et la recharge des nappes phr\u00e9atiques, augmentant ainsi l\u2018\u00e9vapotranspiration. Cela entra\u00eene une augmentation de la couverture nuageuse et des pr\u00e9cipitations.\u00a0<\/p>\n\n\n\n<p><strong>L\u2019augmentation de la couverture nuageuse<\/strong> entra\u00eene une augmentation du refroidissement de l\u2018atmosph\u00e8re par une r\u00e9flexion accrue du rayonnement solaire incident. Mais aussi une augmentation du transfert d\u2018\u00e9nergie vers l\u2018espace qui, combin\u00e9es, ont des effets r\u00e9gulateurs sur le r\u00e9chauffement de la Terre.\u00a0<strong>Lorsque cette r\u00e9troaction \u00e9quilibrante est affaiblie, une terre plus chaude entra\u00eene davantage de s\u00e9cheresses, aggrav\u00e9es par la r\u00e9duction des pr\u00e9cipitations, et davantage d\u2018incendies de v\u00e9g\u00e9tation. Cela r\u00e9chauffe encore plus la terre.\u00a0<\/strong><\/p>\n<\/div><figure class=\"wp-block-media-text__media\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"646\" height=\"639\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/relation-eau-plantes-sols.png?resize=646%2C639&#038;ssl=1\" alt=\"\" class=\"wp-image-3682 size-full\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/relation-eau-plantes-sols.png?w=646&amp;ssl=1 646w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/relation-eau-plantes-sols.png?resize=300%2C297&amp;ssl=1 300w\" sizes=\"(max-width: 646px) 100vw, 646px\" \/><\/figure><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Des solutions n\u00e9cessitant de travailler avec les plantes, le sol et l\u2019eau \u00e0 grande \u00e9chelle pour r\u00e9guler le climat<\/strong><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Prot\u00e9ger et planter les arbres g\u00e9n\u00e9rateurs de rivi\u00e8res d\u2018eau<\/strong>\u00a0dans l&rsquo;air<\/h3>\n\n\n\n<p class=\"has-text-align-justify\"><strong>Chaque arbre de la for\u00eat est une fontaine d\u2018eau.<\/strong> En effet, il aspire l\u2018eau du sol par ses racines, la pompe \u00e0 travers le tronc, les branches et les feuilles. Puis la lib\u00e8re sous forme de vapeur d\u2018eau dans l\u2019atmosph\u00e8re \u00e0 travers les pores de son feuillage. Par une journ\u00e9e ensoleill\u00e9e normale, un seul arbre peut transpirer plusieurs centaines de litres d\u2018eau. Cela permet de rafra\u00eechir son environnement avec une puissance de 70 kWh par 100 litres. Cela repr\u00e9sente un effet de refroidissement \u00e9quivalent \u00e0 celui de deux climatiseurs domestiques fonctionnant pendant 24 heures. Par milliards, les arbres cr\u00e9ent des rivi\u00e8res d\u2018eau g\u00e9antes dans l\u2018air (\u00ab rivi\u00e8res volantes \u00bb).<strong> Ces rivi\u00e8res forment des nuages et cr\u00e9ent des pr\u00e9cipitations \u00e0 des centaines, voire des milliers de kilom\u00e8tres de distance.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"850\" height=\"385\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/rivieres-volantes.png?resize=850%2C385&#038;ssl=1\" alt=\"\" class=\"wp-image-3684\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/rivieres-volantes.png?w=850&amp;ssl=1 850w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/rivieres-volantes.png?resize=300%2C136&amp;ssl=1 300w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/rivieres-volantes.png?resize=768%2C348&amp;ssl=1 768w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Couvrir le sol de plantes pour limiter la temp\u00e9rature et les pertes d\u2019eau<\/strong><\/h3>\n\n\n\n<p class=\"has-text-align-justify\"><strong>Entre 1950 et 2000, la temp\u00e9rature de surface a augment\u00e9 de 0,3\u00b0C \u00e0 l\u2018\u00e9chelle mondiale en raison des changements de la couverture des sols.<\/strong> Les perturbations du bilan \u00e9nerg\u00e9tique \u00e0 la surface g\u00e9n\u00e9r\u00e9es par les changements de v\u00e9g\u00e9tation entre 2000 et 2015 ont entra\u00een\u00e9 une augmentation moyenne de 0,23\u00b0C de la temp\u00e9rature de surface locale o\u00f9 ces changements de v\u00e9g\u00e9tation ont eu lieu. <strong>Le r\u00e9chauffement moyen d\u00fb aux changements de la couverture des sols peut ainsi expliquer 18 \u00e0 40 % des tendances actuelles du r\u00e9chauffement climatique.<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">Sur les surfaces nues, par exemple les champs en jach\u00e8re, les prairies s\u00e8ches (en \u00e9t\u00e9 et apr\u00e8s la r\u00e9colte du foin), et sur les surfaces en b\u00e9ton ou en asphalte, le sol absorbe davantage de rayonnement solaire incident. <strong>Il s\u2018\u00e9chauffe, cr\u00e9e de la chaleur sensible. <\/strong>Et \u00e9mettra ainsi, proportionnellement \u00e0 la puissance quatre de sa temp\u00e9rature absolue (loi de Stefan-Boltzman), une puissance thermique dans l\u2018atmosph\u00e8re.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"777\" height=\"510\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/Difference-sol-nu-et-vegetation.png?resize=777%2C510&#038;ssl=1\" alt=\"\" class=\"wp-image-3685\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/Difference-sol-nu-et-vegetation.png?w=777&amp;ssl=1 777w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/Difference-sol-nu-et-vegetation.png?resize=300%2C197&amp;ssl=1 300w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2024\/06\/Difference-sol-nu-et-vegetation.png?resize=768%2C504&amp;ssl=1 768w\" sizes=\"(max-width: 777px) 100vw, 777px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\"><strong>Les diff\u00e9rences de temp\u00e9rature de surface entre ces surfaces nues et les zones bois\u00e9es peuvent, d\u2018apr\u00e8s un exemple en Europe centrale, atteindre 20\u00b0C les apr\u00e8s-midi d\u2018\u00e9t\u00e9.\u00a0<\/strong> Cela s\u2019explique, l\u00e0 encore, par un effet de refroidissement par \u00e9vaporation des for\u00eats. Ce qui l\u2018emporte sur l\u2018effet de r\u00e9chauffement par alb\u00e9do g\u00e9n\u00e9r\u00e9 par les surfaces bois\u00e9es plus sombres.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Favoriser gr\u00e2ce aux plantes la production d\u2019a\u00e9rosols biog\u00e8nes pour la formation des nuages de pluie et le cycle de l\u2019eau<\/strong><\/h3>\n\n\n\n<p class=\"has-text-align-justify\">La v\u00e9g\u00e9tation semble \u00e9galement \u00eatre un r\u00e9acteur biog\u00e9ochimique dans lesquels la biosph\u00e8re et la photochimie atmosph\u00e9rique produisent des noyaux pour la formation de nuages et de pr\u00e9cipitations, entretenant ainsi le cycle hydrologique. <strong>Les plantes produisent des compos\u00e9s organiques volatils et \u00ablib\u00e8rent\u00bb des microorganismes &#8211; bact\u00e9ries et spores fongiques, pollen et autres d\u00e9bris biologiques. <\/strong>Ces derniers vivent sur les feuilles et se retrouvent en suspension dans l\u2018air pendant et apr\u00e8s la pluie dans les \u00e9cosyst\u00e8mes. Dans l\u2018atmosph\u00e8re, ils g\u00e9n\u00e8rent une partie importante de la condensation des nuages et des noyaux de glace. Ce qui a un impact sur la formation des nuages et des pr\u00e9cipitations.\u00a0<\/p>\n\n\n\n<p class=\"has-text-align-justify\">Les a\u00e9rosols biog\u00e8nes peuvent \u00e9galement contribuer \u00e0 \u00e9lever la temp\u00e9rature de cong\u00e9lation en cr\u00e9ant des noyaux de glace.<strong> Sans ce ph\u00e9nom\u00e8ne, la cong\u00e9lation ne se produirait pas avant que les nuages n\u2018atteignent -15\u00b0C ou moins.<\/strong> Avec l\u2018aide de ces noyaux de glace, le processus peut \u00eatre r\u00e9alis\u00e9 \u00e0 des temp\u00e9ratures proches de 0\u00b0C. Cela permet une formation efficace des nuages et g\u00e9n\u00e8re de la pluie plus facilement et localement.\u00a0<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Si vous souhaitez en savoir plus sur la formation des nuages, consultez notre derni\u00e8re <a href=\"https:\/\/normandiemaine.cerfrance.fr\/arad2\/microorganismes-plantes-et-pluie\/\">publication<\/a> sur le sujet. <\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-small-font-size\">Source : <\/h2>\n\n\n\n<p class=\"has-small-font-size\"><em>Schwarzer S., 2021. <a href=\"https:\/\/wedocs.unep.org\/bitstream\/handle\/20.500.11822\/36619\/FB025_FR.pdf\">Travailler avec les plantes, les sols et l\u2018eau pour refroidir le climat et r\u00e9hydrater les paysages de la Terre<\/a>. Prospective ONU <\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Travailler avec les plantes, le sol et l&rsquo;eau pour refroidir le climat D\u00e9couvrez l&rsquo;importance des plantes et du sol dans le cycle de l&rsquo;eau et la r\u00e9gulation du climat. La [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":3688,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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