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Carbon-Mercury interactions in Spodosols Assessed through Density Fractionation, Radiocarbon Analysis, and Soil Survey information

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dc.contributor.authorNave, Lucas E.en
dc.contributor.authorOrnelas, A. Covarrubiasen
dc.contributor.authorDrevnick, P. E.en
dc.contributor.authorGallo, Adrian C.en
dc.contributor.authorHatten, Jeff A.en
dc.contributor.authorHeckman, Katherine A.en
dc.contributor.authorMatosziuk, Lauren M.en
dc.contributor.authorSanClements, Michael D.en
dc.contributor.authorStrahm, Brian D.en
dc.contributor.authorVeverica, T. J.en
dc.contributor.authorWeiglein, Tyler L.en
dc.contributor.authorSwanston, Christopher W.en
dc.contributor.departmentForest Resources and Environmental Conservationen
dc.date.accessioned2020-03-09T12:41:49Zen
dc.date.available2020-03-09T12:41:49Zen
dc.date.issued2019-02-21en
dc.description.abstractSoils comprise the largest terrestrial pool of C and Hg on Earth, and these elements have critical feedbacks to problems ranging from atmospheric pollution and climate change to public health. Empirical evidence suggests these elements cycle closely in a wide range of soils, but mechanistic studies of their interactions within distinct soil organic matter (SOM) pools and between different soil types are needed. Here, we report findings of a novel approach to investigate C-Hg interactions, primarily in Spodosols, in which we: (i) examined density separated topsoil and illuvial horizons of four contrasting Spodosols, and used radiocarbon to investigate interactions between Hg and C cycling in distinct SOM pools; (ii) assessed broader patterns across Spodosols and other soil orders using USDA soil survey laboratory data. Consistent with other studies, C and Hg concentrations of individual soil horizons were positively related across the four contrasting Spodosols. Carbon and Hg were also positively related in the density fractions comprising individual soil horizons, but radiocarbon analysis revealed fundamental differences in Hg retention in modern, C-rich fractions vs. low-C fractions containing less modem radiocarbon. The lack of significant site-to-site variation in C and Hg across these sites (and Spodosols more broadly), contrasted against significant differences between horizons and fractions, su ests processes controlling C-Hg interactions are consistent across the taxonomic order. Furthermore, significant differences between other soil orders indicate that processes controlling soil formation-as represented by soil taxonomy-can explain differences in C-Hg interactions and their distribution across soils.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesWe thank M. Conley, M. Gormley, K. Hofmeister, J. Klapperich, R. Knudstrup, E. Michaelson, J. Le Moine, J. Tallant, C. Thompson, N. Van Dyke, and P. Zermeno for field and laboratory work. We are grateful to the University of Michigan Biological Station and its Research Experiences for Undergraduates program. This work was facilitated by the International Soil Carbon Network and Radiocarbon Collaborative, and supported by the National Science Foundation (Award Nos. EF-1340681, AGS-1262634, and AGS-1659338), USDA-Forest Service (Agreement Nos. 13-CR11242306-077 and 13-CR11242306-071), and USDA-National Institute of Food and Agriculture, McIntire-Stennis Cooperative Forestry Research Program (Award Nos. 2015-32100-06099 and 2016-32100-06099). We acknowledge the National Ecological Observatory Network (NEON) as fundamental to this effort. NEON is a project sponsored by the NSF and managed under cooperative support agreement (EF-1029808) to Battelle. Lastly, we are grateful to two attentive reviewers whose feedback improved the quality of this work.en
dc.description.sponsorshipNational Science FoundationNational Science Foundation (NSF) [EF-1340681, AGS-1262634, AGS-1659338]; USDA-Forest ServiceUnited States Department of Agriculture (USDA)United States Forest Service [13-CR11242306-077, 13-CR11242306-071]; USDA-National Institute of Food and Agriculture, McIntire-Stennis Cooperative Forestry Research Program [2015-32100-06099, 2016-32100-06099]; NSFNational Science Foundation (NSF); [EF-1029808]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.2136/sssaj2018.06.0227en
dc.identifier.eissn1435-0661en
dc.identifier.issn0361-5995en
dc.identifier.issue1en
dc.identifier.urihttp://hdl.handle.net/10919/97256en
dc.identifier.volume83en
dc.language.isoenen
dc.rightsCreative Commons CC0 1.0 Universal Public Domain Dedicationen
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/en
dc.titleCarbon-Mercury interactions in Spodosols Assessed through Density Fractionation, Radiocarbon Analysis, and Soil Survey informationen
dc.title.serialSoil Science Society of America Journalen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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