| Application of the N(2) /Ar technique to measuring soil-atmosphere N(2) fluxes. | |
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MedLine Citation:
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PMID: 22279021 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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RATIONALE: The emission of dinitrogen (N(2) ) gas from soil is the most poorly constrained flux in terrestrial nitrogen (N) budgets because the high background atmospheric N(2) concentration makes soil N(2) emissions difficult to measure. In this study, we tested the theoretical and analytical feasibility of using the N(2) /Ar technique to measure soil-atmosphere N(2) fluxes. METHODS: Dual inlet isotope ratio mass spectrometry was used to measure δAr/N(2) values of gas sampled from surface flux chambers. In laboratory experiments using dry sand in a diffusion box, we induced a known steady-state flux of N(2) , and then measured the change in the N(2) /Ar ratio of chamber headspace air samples to test our ability to reconstruct this flux. We m\odeled solubility, thermal, and water vapor flux fractionation effects on the N(2) /Ar ratio to constrain physical effects on the measured N(2) flux. RESULTS: In dry sand, an actual N(2) flux of 108 mg N m(-2) day(-1) was measured as 111 ± 19 mg N m(-2) day(-1) (± standard error (SE)). In wet sand, an actual N(2) flux of 160 mg N m(-2) day(-1) was measured as 146 ± 20 mg N m(-2) day(-1) when solubility and water vapor flux fractionation were taken into account. Corrections for thermal fractionation did not improve estimates of N(2) fluxes. CONCLUSIONS: We conclude that our application of the N(2) /Ar technique to soil surface fluxes is valid only above a detection limit of approximately 108 mg N m(-2) day(-1) . The N(2) /Ar method is currently best used as a validation tool for other methods in ecosystems with high soil N(2) fluxes, but, with future improvements, it holds promise to provide high-resolution measurements in systems with low soil N(2) fluxes. Copyright © 2012 John Wiley & Sons, Ltd. |
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Authors:
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Wendy H Yang; Whendee L Silver |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Rapid communications in mass spectrometry : RCM Volume: 26 ISSN: 1097-0231 ISO Abbreviation: Rapid Commun. Mass Spectrom. Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-01-26 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8802365 Medline TA: Rapid Commun Mass Spectrom Country: England |
Other Details:
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Languages: eng Pagination: 449-59 Citation Subset: IM |
Copyright Information:
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Copyright © 2012 John Wiley & Sons, Ltd. |
Affiliation:
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Ecosystem Sciences Division, Department of Environmental Science, Policy, and Management, 130 Mulford Hall #3114, University of California, Berkeley, CA, 94720, USA. wendy_yang@berkeley.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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