{"id":5724,"date":"2015-05-06T14:52:40","date_gmt":"2015-05-06T14:52:40","guid":{"rendered":"https:\/\/www.bioecoactual.com\/2015\/05\/06\/l-agricultura-ecologica-converteix-els-cultius-en-autentics-embornals-de-co2\/"},"modified":"2025-10-05T12:58:56","modified_gmt":"2025-10-05T10:58:56","slug":"l-agricultura-ecologica-converteix-els-cultius-en-autentics-embornals-de-co2","status":"publish","type":"post","link":"https:\/\/www.bioecoactual.com\/ca\/2015\/05\/06\/l-agricultura-ecologica-converteix-els-cultius-en-autentics-embornals-de-co2\/","title":{"rendered":"L’agricultura ecol\u00f2gica converteix els cultius en aut\u00e8ntics embornals de CO2"},"content":{"rendered":"

Aproximadament el 35% dels gasos d’efecte hivernacle (GEI) a nivell mundial provenen de l’agricultura. Tanmateix, aquestes emissions es podrien reduir i fins i tot invertir, per convertir els cultius en aut\u00e8ntics embornals de CO2, un dels gasos causants de l’escalfament global. Aix\u00ed ho demostra un estudi realitzat en una eco-granja de la Xina.<\/p>\n

<\/p>\n

Aproximadament el 35% dels gasos d’efecte hivernacle (GEI) a nivell mundial provenen de l’agricultura (la resta, principalment, de l’\u00fas intensiu de combustibles f\u00f2ssils en las activitats industrials i el transport).<\/p>\n

Alguns experts assenyalen que els \u00e9ssers humans podrien revertir la tend\u00e8ncia global d’emissions contaminants de CO2 (un dels principals gasos responsables de l’escalfament global) a trav\u00e9s d’un canvi en l’agricultura cap als cultius ecol\u00f2gics.<\/p>\n

Aquest tipus de cultiu implicaria un augment del contingut de mat\u00e8ria org\u00e0nica en el s\u00f2l, el que ajudaria no nom\u00e9s en fixar carboni i en reduir las emissions, sin\u00f3 tamb\u00e9 en millorar la capacitat del s\u00f2l de retenir aigua i nutrients i de resistir plagues i sequeres. A m\u00e9s, l’agricultura ecol\u00f2gica podria ser una bona opci\u00f3 per disminuir l’\u00fas intensiu de fertilitzants sint\u00e8tics, amb la conseq\u00fcent protecci\u00f3 del medi ambient i un increment del rendiment agr\u00edcola.<\/p>\n

Pot resultar clau per contrarestar l’emissi\u00f3 de gasos d’efecte hivernacle<\/p><\/blockquote>\n

Caracter\u00edstiques de l’estudi<\/strong><\/p>\n

Pel que fa a l’emissi\u00f3 de gasos d’efecte hivernacle, un estudi recent, realitzat per cient\u00edfics de l’Institut de Bot\u00e0nica de l’Acad\u00e8mia Xina de Ci\u00e8ncies, ha revelat que la substituci\u00f3 de fertilitzants qu\u00edmics por adobs org\u00e0nics disminuiria significativament les esmentades emissions.<\/p>\n

D’aquesta manera, l’agricultura ecol\u00f2gica podria convertir l’ecosistema agr\u00edcola, actual font de carboni contaminant, en un aut\u00e8ntic embornal de carboni.<\/p>\n

Per a explorar el potencial de las terres agr\u00edcoles com a embornals de carboni -sense p\u00e8rdues de rendiment- l’investigador de l’esmentat centre Jiang Gaoming, ha realitzat un experiment en una eco-granja de l’est de la Xina rural, informa Science China Press a trav\u00e9s d’Eurekalert!.<\/p>\n

En aquesta, els residus dels cultius son utilitzats per a l’alimentaci\u00f3 del bestiar; i els fems d’aquest (convertit en compost) \u00e9s tornat a las terres de cultiu amb blat fariner (Triticum aestivum o vulgare, <\/em>esp\u00e8cie de blat m\u00e9s extensament conreada al m\u00f3n) i blat de moro.<\/p>\n

El rendiment d’aquests cultius i les seves emissions de gas d’efecte hivernacle (GEI) van ser calculats acuradament seguint las directrius marcades pel Panel Intergovernamental sobre el Canvi Clim\u00e0tic (IPCC) per a inventaris de gasos d’efecte hivernacle (2006).<\/p>\n

Resultats obtinguts<\/strong><\/p>\n

L’estudi va demostrar que la substituci\u00f3 de fertilitzants qu\u00edmics per adob org\u00e0nic va disminuir significativament l’emissi\u00f3 de gasos d’efecte hivernacle.<\/p>\n

La substituci\u00f3 total, en concret, va disminuir las emissions de gasos d’efecte hivernacle, fins i tot al punt que aquest ecosistema agr\u00edcola va passar de ser una font de carboni (amb una emissi\u00f3 de +2,7 tones m\u00e8triques d’equivalent de CO2 anuals cada dos hect\u00f2metres) a ser un embornal de carboni (-8,8 tones m\u00e8triques d’equivalent de CO2 anuals cada dos hect\u00f2metres).<\/p>\n

Els rendiments del blat i del blat de moro, per la seva part, tamb\u00e9 van augmentar amb la fertilitzaci\u00f3 del s\u00f2l amb els fems de bestiar millorat.<\/p>\n

La millor soluci\u00f3 <\/strong><\/p>\n

Per\u00f2 en tots els efectes que millor va funcionar va ser una combinaci\u00f3 d’adobs org\u00e0nics i fertilitzants qu\u00edmics. Aquesta va demostrar un resultat superior tant en la millora de la qualitat del s\u00f2l i del rendiment dels cultius, com en la disminuci\u00f3 de las emissions de GEI.<\/p>\n

Pel contrari, la utilitzaci\u00f3 exclusiva de fertilitzants qu\u00edmics en las terres de cultiu no solament va conduir a un augment de les emissions de gasos d’efecte hivernacle, sin\u00f3 que tamb\u00e9 va deteriorar la qualitat del s\u00f2l.<\/p>\n

Aix\u00ed que ha quedat constatat que el ple \u00fas de residus de cultius com a farratge per al bestiar, la recol\u00b7lecci\u00f3 i el compostatge dels fems de bestiar; i la substituci\u00f3 de part dels fertilitzants qu\u00edmics por adobs org\u00e0nics s\u00f3n les opcions ideals per reduir el desaprofitament d’energia i les emissions de gasos d’efecte hivernacle, sense que hi hagi p\u00e8rdues en el rendiment pels cultius.<\/p>\n

Refer\u00e8ncia bibliogr\u00e0fica:<\/strong><\/p>\n

Haitao Liu, J.L., Xiao Li, Yanhai Zheng, Sufei Feng, Gaoming Jiang. 2015. Mitigating greenhouse gas emissions through replacement of chemical fertilizer with organic manure in en temperate farmland<\/a>. Science Bulletin<\/em> (2015). DOI: 10.1007\/s11434-014-0679-6.<\/p>\n

Font: <\/strong>Generalitat de Catalunya – Producci\u00f3 Agroaliment\u00e0ria Ecol\u00f2gica www.pae.gencat.cat<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Aproximadament el 35% dels gasos d’efecte hivernacle (GEI) a nivell mundial provenen de l’agricultura. Tanmateix, aquestes emissions es podrien reduir i fins i tot invertir, per convertir els cultius en autèntics embornals de CO2, un dels gasos causants de l’escalfament global. Així ho demostra un estudi realitzat en una eco-granja de la Xina.<\/p>\n","protected":false},"author":419,"featured_media":5722,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7164],"tags":[3613,68,174,88,3615,5318],"class_list":["post-5724","post","type-post","status-publish","format-standard","has-post-thumbnail","category-actualitat","tag-agricultura-ecologica","tag-bio","tag-co2","tag-eco","tag-medi-ambient","tag-redueix-ca-2"],"yoast_head":"\nL'agricultura ecol\u00f2gica converteix els cultius en aut\u00e8ntics embornals de CO2 - Bio Eco Actual<\/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.bioecoactual.com\/ca\/2015\/05\/06\/l-agricultura-ecologica-converteix-els-cultius-en-autentics-embornals-de-co2\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L'agricultura ecol\u00f2gica converteix els cultius en aut\u00e8ntics embornals de CO2\" \/>\n<meta property=\"og:description\" content=\"Aproximadament el 35% dels gasos d’efecte hivernacle (GEI) a nivell mundial provenen de l’agricultura. 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