Functional N-cycle genes in soil and N2O emissions in tropical grass-maize intercropping systems

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dc.contributor.authorGrassmann, Camila S. [UNESP]
dc.contributor.authorMariano, Eduardo [UNESP]
dc.contributor.authorDiniz, Priscila P.
dc.contributor.authorBorges, Beatriz M.F.
dc.contributor.authorBorges, Clovis D.
dc.contributor.authorTsai, Siu M.
dc.contributor.authorRosolem, Ciro A. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionFederal University of Lavras
dc.date.accessioned2022-04-28T19:53:00Z
dc.date.available2022-04-28T19:53:00Z
dc.date.issued2022-06-01
dc.description.abstractThere is evidence that forage grasses such as Megathyrsus and Urochloa can suppress nitrification, with direct or indirect consequences on soil inorganic N dynamics and nitrous oxide (N2O) emissions. However, the influence of soil chemical properties on the dynamics of functional N-genes and losses of N in maize (Zea mays L.) intercropped with forage grasses under N fertilization is poorly understood. In this study, soil samples and N2O emissions were analyzed from a field experiment in which maize (fertilized or not with ammonium-based fertilizer) was intercropped with Guinea grass (M. maximus cv. Tanzânia), palisade grass (U. brizantha cv. Marandu), and ruzigrass (U. ruziziensis cv. Comum). Soil N-cycle microorganisms [16S rRNA of bacteria and archaea, nifH (gene encoding N2-fixing bacteria), ammonia-oxidizing bacteria (AOB) and archaea (AOA), nirS (encoding nitrite reductase), and nosZ (encoding nitrous oxide reductase)] were influenced by forage grass, N fertilization, and sampling time, but no evidence of biological nitrification inhibition was found. Palisade grass was associated with a higher abundance of nifH (7.0 × 105 gene copies g−1 soil, on average) in the absence of N compared with the other grasses (4.3 × 105 gene copies g−1 soil, on average). Nitrogen fertilization increased the abundance of AOB but not AOA. Furthermore, N2O flux was influenced by AOB, water-filled pore space, and N fertilization, whereas the cumulative N2O emission and fertilizer-induced emission factor (0.36%, on average) were not affected by the grasses. In conclusion, this study reveals the strong dominance of AOB under ammonium supply, potentially stimulating N2O emissions in maize-forage grass intercropping systems.en
dc.description.affiliationCollege of Agricultural Sciences São Paulo State University, Av. Universitária, 3780, SP
dc.description.affiliationCenter for Nuclear Energy in Agriculture University of São Paulo, Av. Centenário, 303, SP
dc.description.affiliationFederal University of Lavras, MG
dc.description.affiliationUnespCollege of Agricultural Sciences São Paulo State University, Av. Universitária, 3780, SP
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipCastle Studies Group
dc.description.sponsorshipASCRS Research Foundation
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipBiotechnology and Biological Sciences Research Council
dc.description.sponsorshipIdASCRS Research Foundation: 2015-10267001479
dc.description.sponsorshipIdASCRS Research Foundation: 2015/50305-8
dc.description.sponsorshipIdFAPESP: 2016/25253-7
dc.description.sponsorshipIdFAPESP: 2017/02517-1
dc.description.sponsorshipIdCNPq: 309134/2020-0
dc.description.sponsorshipIdCNPq: 311008/2016-0
dc.description.sponsorshipIdBiotechnology and Biological Sciences Research Council: BB/N013201/1
dc.description.sponsorshipIdASCRS Research Foundation: RCUK-02771/16
dc.identifierhttp://dx.doi.org/10.1016/j.soilbio.2022.108655
dc.identifier.citationSoil Biology and Biochemistry, v. 169.
dc.identifier.doi10.1016/j.soilbio.2022.108655
dc.identifier.issn0038-0717
dc.identifier.scopus2-s2.0-85127804845
dc.identifier.urihttp://hdl.handle.net/11449/223785
dc.language.isoeng
dc.relation.ispartofSoil Biology and Biochemistry
dc.sourceScopus
dc.subjectBiological nitrification inhibition
dc.subjectMegathyrsus
dc.subjectN fertilization
dc.subjectqPCR
dc.subjectUrochloa
dc.subjectZea mays L.
dc.titleFunctional N-cycle genes in soil and N2O emissions in tropical grass-maize intercropping systemsen
dc.typeArtigo
unesp.author.orcid0000-0001-5566-1920 0000-0001-5566-1920[2]
unesp.author.orcid0000-0002-8831-6522[3]
unesp.author.orcid0000-0003-0992-3162[5]

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