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dc.contributor.authorSouza, Wesley dos Santos-
dc.date.accessioned2024-12-05T12:52:22Z-
dc.date.available2024-12-05T12:52:22Z-
dc.date.issued2023-05-26-
dc.identifier.citationSOUZA, Wesley dos Santos. Dinâmica de carbono e nitrogênio em solo sob cultivo de capim Marandu (Urochloa Brizantha cv. Marandu) em monocultura e consorciado com leguminosa forrageira. 2023. 74 f. Tese (Doutorado em Agronomia, Ciência do Solo). Instituto de Agronomia, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2023.pt_BR
dc.identifier.urihttps://rima.ufrrj.br/jspui/handle/20.500.14407/19324-
dc.description.abstractDevido ao atual cenário do aquecimento global que vem provocando as mudanças climáticas, tem-se a necessidade de adoção de estratégias para mitigação das emissões dos gases causadores do efeito estufa (GEEs). Entre, as diversas áreas de ação para mitigação da emissão desses gases, está a agropecuária, responsável por boa parte das emissões de GEEs do Brasil, sendo necessária a implantação de sistemas com potencial de sequestro de carbono via solo, conforme recomenda o Plano de Agricultura de Baixo Carbono. Diante desse cenário este estudo teve como objetivos: 1- Avaliar se o uso de um sistema com pastagem consorciada com leguminosa forrageira é tão eficiente no acúmulo de carbono no solo quanto um sistema em monocultura adubado com fertilizante nitrogenado. 2- Estudar o impacto no acúmulo do carbono e nitrogênio no solo pela implantação, no mesmo ano, de sistemas com pastagens com e sem adubação com fertilizante nitrogenado ou consorciadas com leguminosa forrageira em duas regiões sob condições edafoclimáticas diferentes. Para atingir tais objetivos foram conduzidos três experimentos, a saber: 1- sistemas com pastagem produtiva de Urochloa brizantha cv. Marandu com pastagem consorciada de amendoim forrageiro (Arachis pintoi)- capim Marandu introduzida 8 anos após pastagem de capim-elefante (Pennisetum purpureum) fertilizada com N; 2- estudo instalado em duas áreas experimentais com diferentes condições edafoclimáticas, sendo implantados sistemas com pasto de capim Marandu com e sem fertilização nitrogenada e consorciado com leguminosa forrageira (Arachis pintoi e Desmodium ovalifolium), além de avaliar também sistemas consorciados e em monocultura mais antigos já implantados e tendo como referência a área de vegetação nativa do entorno. Em todos os sistemas foram coletadas amostras de terra para análise da densidade do solo, teores de carbono e nitrogênio total e abundância isotópica de 13C. Como resultados observados, os sistemas com pastagens consorciada com leguminosa forrageira (Arachis pintoi e Desmodium ovalifolium) são recomendados, por acumular carbono no solo em taxas similares ou até maiores que os sistemas de pastagens em monocultura fertilizados com nitrogênio sintético. Os sistemas com pastagens bem manejadas, em monocultura ou consociadas, apresentam maiores quantidades de sequestros de carbono nos anos iniciais após a implantação e reduzem com o avançar dos anos até atingir um equilíbrio. O que interfere no uso do valor de sequestro de curto prazo para projetar o potencial de mitigação de GEE dos sistemas de longo prazo. O sistema implantado para fins de crédito de carbono e projetos de mitigação de GEE, visando o armazenamento e sequestro de carbono no solo, respondem de forma diferenciada quando implantados em regiões com condições edafoclimáticas e/ou históricos de manejos anteriores a implantação diferentes.pt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESpt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal Rural do Rio de Janeiropt_BR
dc.subjectArachis pintoipt_BR
dc.subjectDesmodium ovalifoliumpt_BR
dc.subjectEstoque de carbonopt_BR
dc.subjectMOSpt_BR
dc.subjectCarbon sequestrationpt_BR
dc.subjectSOMpt_BR
dc.titleDinâmica de carbono e nitrogênio em solo sob cultivo de capim marandu (Urochloa brizantha cv. Marandu) em monocultura e consorciado com leguminosa forrageirapt_BR
dc.title.alternativeCarbon and nitrogen dynamics in soil under Marandu grass pasture (Urochloa brizantha cv. Marandu) in monoculture and mixed with forage legumeen
dc.typeTesept_BR
dc.description.abstractOtherDue to the current scenario of climate change that has been causing global warming, there is a need to adopt strategies to mitigate greenhouse gas (GHG) emissions. Among the various areas of action to mitigate greenhouse gases emissions, the agriculture is responsible for a large part of emissions in Brazil. There is a need to implement systems with potential for soil carbon sequestration. Therefore, this study aimed to: 1- Assess whether the use of a system with pasture mixed with forage legumes will be efficient in the carbon sequestration as a monoculture system fertilized with nitrogen. 2- To study the impact on the carbon and nitrogen accumulation in the soil after the system implantation in the same year, evaluating pastures with and without fertilized with nitrogen or mixed with forage legumes in two regions under different edaphoclimatic conditions. To achieve these objectives, three experiments were performed, where 1- systems with productive pasture of Urochloa brizantha cv. Marandu with mixed pasture of forage peanut (Arachis pintoi)-Marandu grass 8 after pasture of elephant grass (Pennisetum purpureum) fertilized with N, 2- study installed in two areas located in regions with different edaphoclimatic experimental conditions, where they were solved systems with Marandu grass pasture with and without nitrogen fertilization and intercropped with forage leguminous, in addition to also evaluating older existing systems and the area of native vegetation in the surroundings. In all systems, soil samples were collected for analysis of soil density, carbon, and nitrogen concentration and 13C isotopic abundance. As results found with these studies, for the implementation of systems that favor carbon sequestration in the soil, systems with pastures intercropped with forage legumes (Arachis pintoi and Desmodium ovalifolium) are recommended, as they accumulate carbon at similar or even higher rates than yeast-fertilized monoculture pasture systems. Systems with well-managed pastures, in monoculture or intercropping, had high rates of carbon sequestration in the initial years after implementation and reduce with advancing years of improvement until reaching a balance. This interferes with the use of the short-term sequestration rate to project the GHG mitigation potential of long-term systems. The improved system for carbon credit purposes and GHG mitigation projects, aimed at storing and sequestering carbon in the soil, respond differently when updated in rules with edaphoclimatic conditions and/or history of management prior to different implementation.en
dc.contributor.advisor1Urquiaga Caballero, Segundo Sacramento-
dc.contributor.advisor1IDhttps://orcid.org/0000-0002-3601-1233pt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/0525790556695433pt_BR
dc.contributor.advisor-co1Boddey, Robert Michael-
dc.contributor.advisor-co1IDhttps://orcid.org/0000-0003-3648-9859pt_BR
dc.contributor.advisor-co1Latteshttp://lattes.cnpq.br/0277415539607307pt_BR
dc.contributor.referee1Urquiaga Caballero, Segundo Sacramento-
dc.contributor.referee1IDhttps://orcid.org/0000-0002-3601-1233pt_BR
dc.contributor.referee1Latteshttp://lattes.cnpq.br/0525790556695433pt_BR
dc.contributor.referee2Pereira, Marcos Gervasio-
dc.contributor.referee2IDhttps://orcid.org/0000-0002-1402-3612pt_BR
dc.contributor.referee2Latteshttp://lattes.cnpq.br/3657759682534978pt_BR
dc.contributor.referee3Pinheiro, Érika Flávia Machado-
dc.contributor.referee3IDhttps://orcid.org/0000-0001-9039-4127pt_BR
dc.contributor.referee3Latteshttp://lattes.cnpq.br/8101589624388403pt_BR
dc.contributor.referee4Jantalia, Cláudia Pozzi-
dc.contributor.referee4IDhttps://orcid.org/0000-0002-6178-6145pt_BR
dc.contributor.referee4Latteshttp://lattes.cnpq.br/3465919209024196pt_BR
dc.contributor.referee5Inácio, Caio de Teves-
dc.contributor.referee5IDhttps://orcid.org/0000-0002-5376-0420pt_BR
dc.contributor.referee5Latteshttp://lattes.cnpq.br/7920142064540802pt_BR
dc.creator.IDhttps://orcid.org/0000-0002-5186-6627pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/4286185972062563pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentInstituto de Agronomiapt_BR
dc.publisher.initialsUFRRJpt_BR
dc.publisher.programPrograma de Pós-Graduação em Agronomia - Ciência do Solopt_BR
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