Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/931501
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dc.contributor.authorBAYER, C.pt_BR
dc.contributor.authorGOMES, J.pt_BR
dc.contributor.authorVIEIRA, F. C. Bpt_BR
dc.contributor.authorZANATTA, J. A.pt_BR
dc.contributor.authorPICCOLO, M. de C.pt_BR
dc.contributor.authorDIECKOW, J.pt_BR
dc.date.accessioned2012-08-17T11:11:11Zpt_BR
dc.date.available2012-08-17T11:11:11Zpt_BR
dc.date.created2012-08-17pt_BR
dc.date.issued2012pt_BR
dc.identifier.citationSoil & Tillage Research, v. 124, p. 1-7, 2012.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/931501pt_BR
dc.descriptionMethane (CH4) emission from agricultural soils increases dramatically as a result of deleterious effect of soil disturbance and nitrogen fertilization on methanotrophic organisms; however, few studies have attempted to evaluate the potential of long-term conservation management systems to mitigate CH4 emissions in tropical and subtropical soils. This study aimed to evaluate the long-term effect (>19 years) of no-till grass- and legume-based cropping systems on annual soil CH4 fluxes in a formerly degraded Acrisol in Southern Brazil. Air sampling was carried out using static chambers and CH4 analysis by gas chromatography. Analysis of historical data set of the experiment evidenced a remarkable effect of high C- and N-input cropping systems on the improvement of biological, chemical, and physical characteristics of this no-tilled soil. Soil CH4 fluxes, which represent a net balance between consumption () and production (+) of CH4 in soil, varied from 40 2 to +62 78 mg C m2 h1. Mean weighted contents of ammonium (NH4+–N) and dissolved organic carbon (DOC) in soil had a positive relationship with accumulated soil CH4 fluxes in the post-management period (r2 = 0.95, p = 0.05), suggesting an additive effect of these nutrients in suppressing CH4 oxidation and stimulating methanogenesis, respectively, in legumebased cropping systems with high biomass input. Annual CH4 fluxes ranged from 50 610 to +994 105 g C ha1, which were inversely related to annual biomass-C input (r2 = 0.99, p = 0.003), with the exception of the cropping system containing pigeon pea, a summer legume that had the highest biologically fixed N input (>300 kg ha1 yr1). Our results evidenced a small effect of conservation management systems on decreasing CH4 emissions from soil, despite their significant effect restoring soil quality. We hypothesized that soil CH4 uptake strength has been off-set by an injurious effect of biologically fixed N in legume-based cropping systems on soil methanotrophic microbiota, and by the methanogenesis increase as a result of the O2 depletion in niches of high biological activity in the surface layer of the no-tillage soil.pt_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectEmissão de gáspt_BR
dc.titleMethane emission from soil under long-term no-till cropping systems.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2015-02-20T11:11:11Zpt_BR
dc.subject.thesagroAgriculturapt_BR
dc.subject.thesagroMetanopt_BR
riaa.ainfo.id931501pt_BR
riaa.ainfo.lastupdate2015-02-20pt_BR
dc.contributor.institutionCIMÉLIO BAYER, UFRGS; JULIANA GOMES, UFRGS; FREDERICO COSTA BEBER VIEIRA, UNIVERSIDADE FEDERAL DO PAMPA; JOSILEIA ACORDI ZANATTA, CNPF; MARISA DE CÁSSIA PICOLLO, CENTRO DE ENERGIA NUCLEAR DA AGRICULTURA; JEFERSON DIECKOW, UFPR.pt_BR
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