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Carbon-degrading enzyme activities stimulated by increased nutrient availability in Arctic tundra soils

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dc.contributor.authorKoyama, Akihiro, author
dc.contributor.authorWallenstein, Matthw D., author
dc.contributor.authorSimpson, Rodney T., author
dc.contributor.authorMoore, John C., author
dc.contributor.authorPublic Library of Science, publisher
dc.coverage.spatialArctic regions
dc.date.accessioned2007-01-03T07:01:04Z
dc.date.available2007-01-03T07:01:04Z
dc.date.issued2013-10
dc.description.abstractClimate-induced warming of the Arctic tundra is expected to increase nutrient availability to soil microbes, which in turn may accelerate soil organic matter (SOM) decomposition. We increased nutrient availability via fertilization to investigate the microbial response via soil enzyme activities. Specifically, we measured potential activities of seven enzymes at four temperatures in three soil profiles (organic, organic/mineral interface, and mineral) from untreated native soils and from soils which had been fertilized with nitrogen (N) and phosphorus (P) since 1989 (23 years) and 2006 (six years). Fertilized plots within the 1989 site received annual additions of 10 g N⋅m-2⋅year-1 and 5 g P⋅m-2⋅year-1. Within the 2006 site, two fertilizer regimes were established - one in which plots received 5 g N⋅m-2⋅year-1 and 2.5 g P⋅m-2⋅year-1 and one in which plots received 10 g N⋅m-2⋅year-1 and 5 g P⋅m-2⋅year-1. The fertilization treatments increased activities of enzymes hydrolyzing carbon (C)-rich compounds but decreased phosphatase activities, especially in the organic soils. Activities of two enzymes that degrade N-rich compounds were not affected by the fertilization treatments. The fertilization treatments increased ratios of enzyme activities degrading C-rich compounds to those for N-rich compounds or phosphate, which could lead to changes in SOM chemistry over the long term and to losses of soil C. Accelerated SOM decomposition caused by increased nutrient availability could significantly offset predicted increased C fixation via stimulated net primary productivity in Arctic tundra ecosystems.
dc.description.sponsorshipPublished with support from the Colorado State University Libraries Open Access Research and Scholarship Fund.
dc.format.mediumborn digital
dc.format.mediumarticles
dc.identifier.bibliographicCitationKoyama, Akihiro, Matthw D. Wallenstein, Rodney T. Simpson and John C. Moore, Carbon-Degrading Enzyme Activities Stimulated by Increased Nutrient Availability in Arctic Tundra Soils. PLoS ONE 8, no. 10 (October 2013): e77212, 1-12. http://dx.doi.org/10.1371/journal.pone.0077212
dc.identifier.doihttps://dx.doi.org/10.1371/journal.pone.0077212
dc.identifier.urihttp://hdl.handle.net/10217/84908
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartofOpen Access Research and Scholarship Fund (OARS)
dc.rights.licenseThis article is open access and distributed under the terms and conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0).
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectsoil organic carbon
dc.subjectsoil organic matter
dc.subjectdecomposition
dc.subjectArctic tundra ecosystem
dc.titleCarbon-degrading enzyme activities stimulated by increased nutrient availability in Arctic tundra soils
dc.typeText

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