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Nitrous oxide nitrification and denitrification 15N enrichment factors from Amazon forest soils

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dc.contributor.author Perez, Tibisay
dc.contributor.author Garcia-Montiel, Diana
dc.contributor.author Trumbore, Susan E.
dc.contributor.author Tyler, Stanley
dc.contributor.author de Camargo, Plinio
dc.contributor.author Moreira, Marcelo
dc.contributor.author Piccolo, Marisa C.
dc.contributor.author Cerri, Carlos C.
dc.date.accessioned 2011-07-20T18:44:29Z
dc.date.available 2011-07-20T18:44:29Z
dc.date.issued 2006-12
dc.identifier.citation Ecological Applications 16 (2006): 2153–2167 en_US
dc.identifier.uri http://hdl.handle.net/1912/4700
dc.description Author Posting. © Ecological Society of America, 2006. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 16 (2006): 2153–2167, doi:10.1890/1051-0761(2006)016[2153:NONADN]2.0.CO;2. en_US
dc.description.abstract The isotopic signatures of 15N and 18O in N2O emitted from tropical soils vary both spatially and temporally, leading to large uncertainty in the overall tropical source signature and thereby limiting the utility of isotopes in constraining the global N2O budget. Determining the reasons for spatial and temporal variations in isotope signatures requires that we know the isotope enrichment factors for nitrification and denitrification, the two processes that produce N2O in soils. We have devised a method for measuring these enrichment factors using soil incubation experiments and report results from this method for three rain forest soils collected in the Brazilian Amazon: soil with differing sand and clay content from the Tapajos National Forest (TNF) near Santarém, Pará, and Nova Vida Farm, Rondônia. The 15N enrichment factors for nitrification and denitrification differ with soil texture and site: −111‰ ± 12‰ and −31‰ ± 11‰ for a clay-rich Oxisol (TNF), −102‰ ± 5‰ and −45‰ ± 5‰ for a sandier Ultisol (TNF), and −10.4‰ ± 3.5‰ (enrichment factor for denitrification) for another Ultisol (Nova Vida) soil, respectively. We also show that the isotopomer site preference (δ15Nα − δ15Nβ, where α indicates the central nitrogen atom and β the terminal nitrogen atom in N2O) may allow differentiation between processes of production and consumption of N2O and can potentially be used to determine the contributions of nitrification and denitrification. The site preferences for nitrification and denitrification from the TNF-Ultisol incubated soils are: 4.2‰ ± 8.4‰ and 31.6‰ ± 8.1‰, respectively. Thus, nitrifying and denitrifying bacteria populations under the conditions of our study exhibit significantly different 15N site preference fingerprints. Our data set strongly suggests that N2O isotopomers can be used in concert with traditional N2O stable isotope measurements as constraints to differentiate microbial N2O processes in soil and will contribute to interpretations of the isotopic site preference N2O values found in the free troposphere. en_US
dc.description.sponsorship This work was funded by the National Science Foundation (SET, award #ATM-9905784; SCT, award #EAR- 0312004). We also received support from a National Science Foundation Major Research Instrumentation award (SCT, #ATM-9871077) and an instrumentation award to the University of California–Irvine from the W. M. Keck Foundation. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher Ecological Society of America en_US
dc.relation.uri http://dx.doi.org/10.1890/1051-0761(2006)016[2153:NONADN]2.0.CO;2
dc.subject Amazon forest soils en_US
dc.subject Denitrification en_US
dc.subject Isotopic enrichment factors en_US
dc.subject Isotopomers en_US
dc.subject Nitrification en_US
dc.subject Nitrous oxide en_US
dc.subject Site preference en_US
dc.title Nitrous oxide nitrification and denitrification 15N enrichment factors from Amazon forest soils en_US
dc.type Article en_US
dc.identifier.doi 10.1890/1051-0761(2006)016[2153:NONADN]2.0.CO;2


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