Show simple item record

dc.contributor.authorBradley, R. L.
dc.contributor.authorWhalen, J.
dc.contributor.authorChagnon, P. -L.
dc.contributor.authorLanoix, M.
dc.contributor.authorAlves, M. C. [UNESP]
dc.identifier.citationApplied Soil Ecology. Amsterdam: Elsevier B.V., v. 47, n. 1, p. 6-13, 2011.
dc.description.abstractVegetated riparian buffer strips have been established in Southern Quebec (Canada) in order to intercept nutrients such as nitrate (NO(3)(-)) and protect water quality near agricultural fields. Buffer strips may also favour denitrification through a combination of high soil moisture, NO(3)(-) and carbon supply, which could lead to the production of nitrous oxide (N(2)O), a greenhouse gas. Denitrification could be further amplified by the presence of earthworms, or by plant species that promote earthworm and bacterial activity in soils. Soils from four farms, comprising maize fields and adjacent buffer strips, were sampled in the fall of 2008. A total of six earthworm species were found, but average earthworm biomass did not differ between buffer strips and maize agroecoecosystems. Nitrate concentrations and net nitrification rates were higher in the maize fields than in the buffer strips: there was no difference in N(2)O production in soils collected from the two sampling locations. Potential denitrification, measured by acetylene inhibition, varied by two orders of magnitude, depending on experimental conditions: when amended with H(2)O or with H(2)O + NO3-, potential denitrification was higher (P < 0.05) in soils from buffer strips than from maize fields. Potential denitrification was highest in soils amended with H(2)O+glucose, or with H(2)O+ NO(3)(-) + glucose. Using microcosms, we tested the effect of litter-soil mixtures on earthworm growth, and the effect of earthworm-litter-soil mixtures on potential denitrification. Based on four categories of chemical assays, litters of woody species (oak, apple, Rhododendron) were generally of lower nutritional quality than litter from agronomic species (alfalfa, switchgrass, corn stover). Alfalfa litter had the most positive effect, whereas apple litter had the most negative effect, on earthworm growth. Potential denitrification was 2-4 times higher in earthworm-litter-soil mixtures than in plain soil. Litter treatments that included corn stover had lower potential denitrification than those that included alfalfa or switchgrass, whereas litter treatments that included oak had lower potential denitrification than those that included apple or Rhododendron. Results suggest that potential N(2)O emissions may be higher in riparian buffer strips than in adjacent maize fields, that N(2)O emissions in buffer strips may be amplified by comminuting earthworms, and that plant litters that reduce earthworm growth may not be best at mitigating N(2)O emissions. (c) 2010 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipFQRNT-Centre SEVE
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada (NSERC)
dc.publisherElsevier B.V.
dc.relation.ispartofApplied Soil Ecology
dc.sourceWeb of Science
dc.subjectLitter qualityen
dc.subjectN(2)O productionen
dc.subjectPotential denitrificationen
dc.subjectRiparian buffer stripsen
dc.titleNitrous oxide production and potential denitrification in soils from riparian buffer strips: Influence of earthworms and plant litteren
dcterms.rightsHolderElsevier B.V.
dc.contributor.institutionUniv Sherbrooke
dc.contributor.institutionMcGill Univ
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.description.affiliationUniv Sherbrooke, Dept Biol, Sherbrooke, PQ J1K 2R1, Canada
dc.description.affiliationMcGill Univ, Dept Nat Resource Sci, Ste Anne de Bellevue, PQ H9X 3V9, Canada
dc.description.affiliationUniv Estadual Paulista, Fac Engn, BR-15385000 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Engn, BR-15385000 São Paulo, Brazil
dc.rights.accessRightsAcesso restrito
Localize o texto completo

Files in this item


There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record