Use este identificador para citar ou linkar para este item: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572290
Título: Emissões de NO, N2O e CO2 em agroecossistemas do Cerrado.
Autoria: CARVALHO, A. M. de
BUSTAMANTE, M. M. da C.
Afiliação: Arminda Moreira de Carvalho, CPAC; Mercedes Maria da Cunha Bustamante, UnB.
Ano de publicação: 2007
Referência: Planaltina, DF: Embrapa Cerrados, 2007.
Páginas: 26 p.
Conteúdo: ABSTRACT: In the last 30 years, the Cerrado Biome has suffered very intense conversion of its native vegetation into croplands (Brazilian Savanna). This habitat modification has contributed with 25% and 90% of the total CO2 and N2O anthropogenic emission respectively. Soil preparation (tillage and no-tillage), deposition of crop residues, cultivation of N-fixing species and nitrogen fertilization are management practices that influence trace gas fluxes from soil to atmosphere. Nevertheless, the interaction between such practices and NO, N2O and CO2 fluxes in the Cerrado region is still unclear. Raining events after the dry season results in NO and CO2 pulses. The interaction between nitrogen application-during rain events affects NO and CO2 emissions. The soil in the no-tillage system when under leguminosae shows higher annual emissions of CO2. In the seasonal dry, most of the N2O fluxes values are below the detection limit. Higher NO fluxes are found immediately (5.4 ng NO-N cm-2 h-1) and 3 days (4,8 ng NO-N cm-2 h-1) after N fertilization and irrigation. After the first pulses of NO (5,4 ng NO-N cm-2 H-1 and 4,8 ng NO-N cm-2 h-1), the emission decreases significantly (1.9 ng NO-N cm-2 h-1). Residues of cover plants and nitrogen fertilization associated to raining events affects trace gas fluxes.
Thesagro: Carbono
Conservação do Solo
Efeito Estufa
Gás
Matéria Orgânica
Manejo do Solo
NAL Thesaurus: greenhouse effect
gases
carbon
organic matter
soil management
soil conservation
Série: (Embrapa Cerrados. Documentos, 188).
Tipo do Material: Folhetos
Acesso: openAccess
Aparece nas coleções:Série Documentos (CPAC)

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