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dc.contributor.authorCARVALHO, A. M. dept_BR
dc.contributor.authorBUSTAMANTE, M. M. da C.pt_BR
dc.date.accessioned2011-07-08T11:54:51Z-
dc.date.available2011-07-08T11:54:51Z-
dc.date.created2008-04-24pt_BR
dc.date.issued2007pt_BR
dc.identifier.citationPlanaltina, DF: Embrapa Cerrados, 2007.pt_BR
dc.identifier.urihttp://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572290pt_BR
dc.descriptionABSTRACT: 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.pt_BR
dc.language.isoporpt_BR
dc.relation.ispartofseries(Embrapa Cerrados. Documentos, 188).pt_BR
dc.rightsopenAccesspt_BR
dc.titleEmissões de NO, N2O e CO2 em agroecossistemas do Cerrado.pt_BR
dc.typeFolhetospt_BR
dc.date.updated2011-07-08T11:54:51Zpt_BR
dc.subject.thesagroCarbonopt_BR
dc.subject.thesagroConservação do Solopt_BR
dc.subject.thesagroEfeito Estufapt_BR
dc.subject.thesagroGáspt_BR
dc.subject.thesagroMatéria Orgânicapt_BR
dc.subject.thesagroManejo do Solopt_BR
dc.subject.nalthesauruscarbonpt_BR
dc.subject.nalthesaurusgasespt_BR
dc.subject.nalthesaurusgreenhouse effectpt_BR
dc.subject.nalthesaurusorganic matterpt_BR
dc.subject.nalthesaurussoil managementpt_BR
dc.subject.nalthesaurussoil conservationpt_BR
dc.format.extent226 p.pt_BR
riaa.ainfo.id572290pt_BR
riaa.ainfo.lastupdate2009-10-20pt_BR
dc.contributor.institutionArminda Moreira de Carvalho, CPAC; Mercedes Maria da Cunha Bustamante, UnB.pt_BR
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