{"id":933,"date":"2020-09-29T06:34:48","date_gmt":"2020-09-29T06:34:48","guid":{"rendered":"https:\/\/jazairhope.org\/?p=933"},"modified":"2020-10-15T23:51:33","modified_gmt":"2020-10-15T23:51:33","slug":"elle-est-un-plaisir-intelligent","status":"publish","type":"post","link":"https:\/\/jazairhope.org\/fr\/elle-est-un-plaisir-intelligent\/","title":{"rendered":"Les oasis sahariennes, rempart menac\u00e9 contre la d\u00e9sertification"},"content":{"rendered":"<p>September 29, 2020 5.07pm EDT<\/p>\n<p>Consid\u00e9r\u00e9es autrefois comme limite de l\u2019\u0153koum\u00e8ne (civilisation), les oasis sahariennes existaient d\u00e9j\u00e0 au 4<sup>e<\/sup>\u00a0si\u00e8cle apr. J.-C. Elles ont \u00e9t\u00e9 cr\u00e9\u00e9es par les humains gr\u00e2ce \u00e0 un savoir-faire g\u00e9n\u00e9rationnel h\u00e9rit\u00e9, qui a su s\u2019adapter aux contraintes du milieu aride du Sahara. Ces espaces se caract\u00e9risent par leurs palmeraies, o\u00f9 le palmier dattier offre une ambiance climatique favorable au bien-\u00eatre humain. Dans le Sahara alg\u00e9rien, il existe 9\u00a0r\u00e9gions oasiennes c\u00e9l\u00e8bres, parmi lesquelles on retrouve les oasis de vall\u00e9es, Oued Righ \u00e0 Touggourt et Oued M\u2019ya \u00e0 Ouargla.<\/p>\n<p>Toutefois, les pratiques anthropiques conditionnent l\u2019optimalit\u00e9 des palmiers dattiers comme source nourrici\u00e8re pour les populations sahariennes \u00e0 l\u2019\u00e9chelle locale, selon qu\u2019elles respectent ou non le respect du savoir-faire local. Les palmiers jouent aussi un r\u00f4le \u00e0 l\u2019\u00e9chelle plan\u00e9taire, en contribuant \u00e0 lutter contre le r\u00e9chauffement climatique et la d\u00e9sertification.<\/p>\n<p>Se nouent ainsi entre les populations et leurs oasis des interd\u00e9pendances dont l\u2019\u00e9quilibre fragile est \u00e0 pr\u00e9server.<\/p>\n<figure class=\"align-center \"><img decoding=\"async\" src=\"https:\/\/images.theconversation.com\/files\/357859\/original\/file-20200914-14-th5a50.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" sizes=\"(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px\" srcset=\"https:\/\/images.theconversation.com\/files\/357859\/original\/file-20200914-14-th5a50.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=388&amp;fit=crop&amp;dpr=1 600w, https:\/\/images.theconversation.com\/files\/357859\/original\/file-20200914-14-th5a50.png?ixlib=rb-1.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=388&amp;fit=crop&amp;dpr=2 1200w, https:\/\/images.theconversation.com\/files\/357859\/original\/file-20200914-14-th5a50.png?ixlib=rb-1.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=388&amp;fit=crop&amp;dpr=3 1800w, https:\/\/images.theconversation.com\/files\/357859\/original\/file-20200914-14-th5a50.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=487&amp;fit=crop&amp;dpr=1 754w, https:\/\/images.theconversation.com\/files\/357859\/original\/file-20200914-14-th5a50.png?ixlib=rb-1.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=487&amp;fit=crop&amp;dpr=2 1508w, https:\/\/images.theconversation.com\/files\/357859\/original\/file-20200914-14-th5a50.png?ixlib=rb-1.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=487&amp;fit=crop&amp;dpr=3 2262w\" alt=\"\" \/><figcaption><span class=\"caption\">Jardin oasien biodiversifi\u00e9 sur 2\u00a0\u00e9tages dans la palmeraie du Ksar de Ouargla en Alg\u00e9rie. En avant-plan, il s\u2019agit de choux fourragers avec deux vari\u00e9t\u00e9s, \u00e0 fleurs jaunes et blanches. L\u2019agriculteur produit sa propre semence. Juste derri\u00e8re, il s\u2019agit de luzerne dont la vari\u00e9t\u00e9 permet 10\u00a0coupes par an.<\/span>\u00a0<span class=\"attribution\"><span class=\"source\">Khaled Amrani<\/span>,\u00a0<span class=\"license\">Author provided<\/span><\/span><\/figcaption><\/figure>\n<h2>Les dattes des caravaniers \u00e0 l\u2019origine des oasis<\/h2>\n<p>Le commerce caravanier serait \u00e0 l\u2019origine de l\u2019expansion des palmiers dattiers, entre l\u2019an 600 et la fin de l\u2019an 1600 \u00e0 travers le Sahara. Cette hypoth\u00e8se est la plus forte lorsque l\u2019on tente d\u2019expliquer le d\u00e9veloppement de la culture de dattiers en Afrique du Nord\u00a0: elle s\u2019appuie sur la th\u00e8se diffusionniste, courant de pens\u00e9e en socioanthropologie qui permet d\u2019expliquer les flux migratoires selon les contacts interculturels. Cette p\u00e9riode correspond en effet au d\u00e9veloppement de grandes routes commerciales gr\u00e2ce \u00e0 l\u2019introduction du dromadaire. Le transfert de \u00ab\u00a0technologie ancestrale\u00a0\u00bb s\u2019amorce et se diffuse, donnant naissance\u00a0<a href=\"http:\/\/sciencepress.mnhn.fr\/fr\/periodiques\/anthropozoologica\/39\/1\/odeur-sui-generis-le-subterfuge-dans-la-domestication-du-palmier-dattier-tassili-n-ajjer-algerie\">aux premi\u00e8res oasis \u00e0 palmiers dattiers<\/a>.<\/p>\n<p>Bien que l\u2019histoire des oasis du Maghreb rec\u00e8le encore de nombreux secrets, par manque de fouilles arch\u00e9ologiques, le raisonnement logique permet une reconstitution des sc\u00e9narios probables.<\/p>\n<p>Aussi simple que cela puisse para\u00eetre, ce sont les noyaux de dattes crach\u00e9s \u00e0 proximit\u00e9 des points d\u2019eau qui ont donn\u00e9 naissance aux premiers palmiers puis aux oasis \u2013 leurs fruits et le lait de chamelle constituaient la ration principale des caravaniers qui utilisaient les points d\u2019eau comme aire de repos lors de la travers\u00e9e. Au fil des ann\u00e9es, ces palmiers ont pouss\u00e9 et donn\u00e9 leurs premiers fruits. Les caravanes pouvaient enfin s\u2019affranchir d\u2019une partie des denr\u00e9es alimentaires au profit de produits \u00e0 vendre \u2013 ou plut\u00f4t \u00e0 troquer \u2013 car elles savaient qu\u2019elles trouveraient de quoi se restaurer une fois sur place.<\/p>\n<p>La s\u00e9dentarisation d\u2019anciens nomades a ensuite probablement particip\u00e9 au d\u00e9veloppement de ces lieux au 13<sup>e<\/sup>\u00a0si\u00e8cle (1200\u20131300), p\u00e9riode qui correspond \u00e0 l\u2019apog\u00e9e du commerce caravanier o\u00f9 les aires de repos (les oasis) sont devenues des points strat\u00e9giques. D\u00e9sormais, la palmeraie a des habitants pour s\u2019occuper d\u2019elle et peut ainsi s\u2019\u00e9panouir. Ces points \u00ab\u00a0n\u00e9vralgiques\u00a0\u00bb sont devenus, par la suite, des villes-carrefours incontournables.<\/p>\n<h2>Un \u00e9cosyst\u00e8me soign\u00e9 par l\u2019humain<\/h2>\n<p>Transmis de g\u00e9n\u00e9ration en g\u00e9n\u00e9ration, un savoir-faire se met en place. Les palmeraies sont cultiv\u00e9es sur deux ou trois \u00e9tages o\u00f9 cohabitent diff\u00e9rentes vari\u00e9t\u00e9s pr\u00e9coces, tardives, rustiques et adapt\u00e9es. Un \u00e9levage y est associ\u00e9, assurant la nourriture en prot\u00e9ines et une fertilit\u00e9 reproductible des sols gr\u00e2ce au fumier fourni.<\/p>\n<p>L\u2019\u00e9tage sup\u00e9rieur compos\u00e9 de palmiers dattiers conditionne l\u2019installation d\u2019une ambiance climatique favorable \u00e0 l\u2019\u00e9panouissement des cultures intercalaires. La surface th\u00e9orique est de fait multipli\u00e9e par 1,75. Cela permet\u00a0<a href=\"https:\/\/www.persee.fr\/doc\/remmm_0035-1474_1980_num_30_1_1898\">d\u2019optimiser les rendements<\/a>\u00a0en qualit\u00e9 (diversit\u00e9 des cultures) et en quantit\u00e9 (tonnage \u00e0 l\u2019hectare).<\/p>\n<p>C\u2019est gr\u00e2ce aux humains que la palmeraie s\u2019est \u00e9panouie mais c\u2019est aussi \u00e0 cause d\u2019eux qu\u2019elle se d\u00e9grade selon les choix op\u00e9r\u00e9s. Ces derniers sont orient\u00e9s par les mesures d\u2019aides \u00e9tatiques, souvent ax\u00e9es sur la productivit\u00e9 qui \u00e0 son tour est tributaire d\u2019intrants d\u2019origine chimique. Il en r\u00e9sulte des risques imminents sur la d\u00e9gradation de la fertilit\u00e9 des sols et une pollution environnementale susceptible de provoquer un d\u00e9s\u00e9quilibre \u00e9cologique.<\/p>\n<figure class=\"align-center zoomable\"><a href=\"https:\/\/images.theconversation.com\/files\/357142\/original\/file-20200909-22-1mane5l.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip\"><img decoding=\"async\" src=\"https:\/\/images.theconversation.com\/files\/357142\/original\/file-20200909-22-1mane5l.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" sizes=\"(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px\" srcset=\"https:\/\/images.theconversation.com\/files\/357142\/original\/file-20200909-22-1mane5l.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=583&amp;fit=crop&amp;dpr=1 600w, https:\/\/images.theconversation.com\/files\/357142\/original\/file-20200909-22-1mane5l.png?ixlib=rb-1.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=583&amp;fit=crop&amp;dpr=2 1200w, https:\/\/images.theconversation.com\/files\/357142\/original\/file-20200909-22-1mane5l.png?ixlib=rb-1.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=583&amp;fit=crop&amp;dpr=3 1800w, https:\/\/images.theconversation.com\/files\/357142\/original\/file-20200909-22-1mane5l.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=733&amp;fit=crop&amp;dpr=1 754w, https:\/\/images.theconversation.com\/files\/357142\/original\/file-20200909-22-1mane5l.png?ixlib=rb-1.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=733&amp;fit=crop&amp;dpr=2 1508w, https:\/\/images.theconversation.com\/files\/357142\/original\/file-20200909-22-1mane5l.png?ixlib=rb-1.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=733&amp;fit=crop&amp;dpr=3 2262w\" alt=\"\" \/><\/a><\/p>\n<div class=\"enlarge_hint\"><\/div><figcaption><span class=\"caption\">Les villes-carrefours transsahariennes.<\/span>\u00a0<span class=\"attribution\"><span class=\"source\">Pliez O., _Vieux r\u00e9seaux et nouvelles circulations entre les deux rives du Sahara_ (2002), carte modifi\u00e9e par l\u2019auteur<\/span><\/span><\/figcaption><\/figure>\n<h2>Oasis et services \u00e9cosyst\u00e9miques<\/h2>\n<p>L\u2019oasis rev\u00eat aujourd\u2019hui des fonctions vari\u00e9es. C\u2019est un espace de production, de vill\u00e9giature mais aussi un lieu qui contribue \u00e0 l\u2019\u00e9quilibre \u00e9cologique. Alors que le palmier fournit des dattes \u00e0 haute valeur marchande, premi\u00e8re source d\u2019attraction pour les acteurs \u00e9conomiques, son ombre permet en parall\u00e8le \u00e0 d\u2019autres cultures de pousser. Il procure \u00e9galement une fra\u00eecheur bienvenue face aux temp\u00e9ratures extr\u00eames du Sahara.<\/p>\n<p>Le meilleur exemple est l\u2019effet m\u00e9so climatique (climat qui r\u00e8gne \u00e0 l\u2019int\u00e9rieur d\u2019une oasis) et la capacit\u00e9 d\u2019une palmeraie a att\u00e9nu\u00e9 la rudesse du climat environnant. La carte ci-dessous concerne l\u2019ancienne palmeraie du Ksar de Ouargla. Elle est caract\u00e9ris\u00e9e par une relative biodiversit\u00e9, probablement menac\u00e9e, mais qui exerce encore, \u00e0 certains endroits, un effet tampon.<\/p>\n<figure class=\"align-center zoomable\"><a href=\"https:\/\/images.theconversation.com\/files\/357861\/original\/file-20200914-20-1l130q3.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip\"><img decoding=\"async\" src=\"https:\/\/images.theconversation.com\/files\/357861\/original\/file-20200914-20-1l130q3.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" sizes=\"(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px\" srcset=\"https:\/\/images.theconversation.com\/files\/357861\/original\/file-20200914-20-1l130q3.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=781&amp;fit=crop&amp;dpr=1 600w, https:\/\/images.theconversation.com\/files\/357861\/original\/file-20200914-20-1l130q3.png?ixlib=rb-1.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=781&amp;fit=crop&amp;dpr=2 1200w, https:\/\/images.theconversation.com\/files\/357861\/original\/file-20200914-20-1l130q3.png?ixlib=rb-1.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=781&amp;fit=crop&amp;dpr=3 1800w, https:\/\/images.theconversation.com\/files\/357861\/original\/file-20200914-20-1l130q3.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=981&amp;fit=crop&amp;dpr=1 754w, https:\/\/images.theconversation.com\/files\/357861\/original\/file-20200914-20-1l130q3.png?ixlib=rb-1.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=981&amp;fit=crop&amp;dpr=2 1508w, https:\/\/images.theconversation.com\/files\/357861\/original\/file-20200914-20-1l130q3.png?ixlib=rb-1.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=981&amp;fit=crop&amp;dpr=3 2262w\" alt=\"\" \/><\/a><\/p>\n<div class=\"enlarge_hint\"><\/div><figcaption><span class=\"caption\">Simulation de l\u2019effet m\u00e9so climatique dans la palmeraie de la cuvette de Ouargla. L\u2019effet m\u00e9so climatique est tr\u00e8s peu document\u00e9 et fait l\u2019objet de nombreuses critiques. Certains auteurs le classe comme \u00e9tant un microclimat. Or, les \u00e9cologues dont l\u2019ornithologue Jacques Blondel pr\u00e9cise que ce dernier r\u00e8gne dans un vieux tronc d\u2019arbre, par exemple, qui abrite une entomofaune xylophage (qui mange le bois) diversifi\u00e9e et qui contribue \u00e0 l\u2019\u00e9quilibre \u00e9cologique de la for\u00eat.<\/span>\u00a0<span class=\"attribution\"><span class=\"source\">Blondel J, _Biodiversit\u00e9 et naturalit\u00e9\u00a0: histoire et \u00e9volution des concepts_ (2012)<\/span>,\u00a0<a class=\"license\" href=\"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/\">CC BY-NC-ND<\/a><\/span><\/figcaption><\/figure>\n<p>La succession d\u2019oasis forme aussi un corridor qui facilite le d\u00e9placement de la faune migratrice, notamment les oiseaux europ\u00e9ens qui traversent le Sahara dans les deux sens\u00a0<a href=\"https:\/\/www.actahort.org\/books\/994\/994_5.htm\">au printemps et \u00e0 l\u2019automne<\/a><\/p>\n<p>L\u2019ensemble de ces services dits \u00ab\u00a0\u00e9cosyst\u00e9miques\u00a0\u00bb agissent de fa\u00e7on simultan\u00e9e, \u00e0 condition bien s\u00fbr que l\u2019humain ne s\u2019y oppose pas.<\/p>\n<h2>La progression d\u2019une agriculture productiviste<\/h2>\n<p>Depuis l\u2019\u00e9poque paysanne, les mentalit\u00e9s ont progressivement fait \u00e9voluer au sein des oasis l\u2019agriculture d\u2019autosubsistance vers une agriculture productiviste commerciale.<\/p>\n<p>Les deux mod\u00e8les ont leurs arguments. Le commercial pr\u00e9tend moderniser l\u2019activit\u00e9 et augmenter les rendements pour satisfaire les besoins croissants des populations. L\u2019agriculture paysanne de son c\u00f4t\u00e9 d\u00e9fend l\u2019authenticit\u00e9 des produits de terroir, gage d\u2019une nourriture de qualit\u00e9. Dans ce contexte, le choix semble impossible\u00a0: la quantit\u00e9 comme la qualit\u00e9 apparaissent indispensables.<\/p>\n<p>Sur le terrain, la r\u00e9alit\u00e9 a impos\u00e9 le mod\u00e8le quantitatif \u00e0 cause des exigences de l\u2019\u00e9conomie de march\u00e9. Les producteurs sont souvent des investisseurs qui d\u00e9veloppent des projets \u00ab\u00a0d\u2019agro-business\u00a0\u00bb avec des moyens de production tr\u00e8s modernes, non sans cons\u00e9quences sur l\u2019environnement naturel (d\u00e9gradation des ressources) et social (marginalisation de l\u2019agriculture paysanne).<\/p>\n<p>Les politiques agricoles incitatives qui octroient \u00e0 ces mod\u00e8les de g\u00e9n\u00e9reuses subventions ont largement contribu\u00e9 \u00e0 leur d\u00e9veloppement, lequel attire des op\u00e9rateurs \u00e9conomiques souvent \u00e9trangers \u00e0 la profession et \u00e0 la r\u00e9gion. Les projets se sont donc d\u00e9velopp\u00e9s dans la m\u00e9connaissance des impacts locaux.<\/p>\n<p>Les oasis, autrefois forts de la diversit\u00e9 de leur culture et de leurs fonctions, se sont transform\u00e9es en espaces monoculturaux. \u00c0 titre d\u2019exemple, la phoeniciculture (culture du palmier dattier), la vari\u00e9t\u00e9 d\u00e9glet nour est pr\u00e9dominante puisqu\u2019elle constitue 70\u00a0% de l\u2019ensemble des oasis alg\u00e9riennes. C\u2019est une vari\u00e9t\u00e9 exigeante, tr\u00e8s gourmande en eau et d\u00e9pendantes de fertilisants et de pesticides, surtout lorsque les superficies d\u00e9passent les 50\u00a0hectares. De plus, ces palmeraies de cr\u00e9ation moderne sont install\u00e9es dans des p\u00e9rim\u00e8tres dits de mise en valeur en dehors des anciennes palmeraies et de leur effet m\u00e9so climatique. Ces intrants sont appliqu\u00e9s, pour rappel, sur des sols filtrants qui risquent de contaminer l\u2019unique ressource hydrique fossile du Sahara pour les hommes, les cultures et les animaux.<\/p>\n<p>Si les fonctions agroenvironnementales des palmeraies sont ind\u00e9niables, les oasis sont d\u00e9sormais tributaires des mod\u00e8les agricoles d\u00e9velopp\u00e9s par l\u2019activit\u00e9 humaine. La progression du mod\u00e8le productiviste menace aussi bien l\u2019environnement que le bien-\u00eatre \u00e0 terme des populations. L\u2019oasis constitue pourtant un instrument efficace de lutte contre le r\u00e9chauffement climatique et la d\u00e9sertification.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>September 29, 2020 5.07pm EDT Consid\u00e9r\u00e9es autrefois comme limite de l\u2019\u0153koum\u00e8ne (civilisation), les oasis sahariennes existaient d\u00e9j\u00e0 au 4e\u00a0si\u00e8cle apr. J.-C. Elles&hellip;<\/p>\n","protected":false},"author":1,"featured_media":716,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[53],"tags":[],"class_list":["post-933","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-le-sahara-algerien"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Les oasis sahariennes, rempart menac\u00e9 contre la d\u00e9sertification - AAH.JZR<\/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:\/\/jazairhope.org\/fr\/elle-est-un-plaisir-intelligent\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les oasis sahariennes, rempart menac\u00e9 contre la d\u00e9sertification - AAH.JZR\" \/>\n<meta property=\"og:description\" content=\"September 29, 2020 5.07pm EDT Consid\u00e9r\u00e9es autrefois comme limite de l\u2019\u0153koum\u00e8ne (civilisation), les oasis sahariennes existaient d\u00e9j\u00e0 au 4e\u00a0si\u00e8cle apr. 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