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Are Plants Able to Utilize Nitrogen Released from Thawing Permafrost? Implications for Carbon Cycling and Feedback with the Climate System

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dc.contributor.advisor Turetsky, Merritt
dc.contributor.author Albano, Lucas Jacob
dc.date.accessioned 2018-05-07T17:42:19Z
dc.date.available 2018-05-07T17:42:19Z
dc.date.copyright 2018-05
dc.date.created 2018-04-25
dc.date.issued 2018-05-07
dc.identifier.uri http://hdl.handle.net/10214/12987
dc.description.abstract Climate warming in high-latitude regions triggers widespread permafrost thaw, releasing massive amounts of carbon and nitrogen that were previously frozen in soil organic matter, through increased microbial activity. Climate warming has motivated extensive research on permafrost carbon release; however, fewer studies have addressed whether plants can access new nitrogen sources, potentially increasing primary productivity. Two research questions were explored using Carex aquatilis in sites experiencing thaw and thermokarst in interior Alaska: 1) does C. aquatilis ammonium uptake vary with depth and time-since-thaw; 2) does variation in C. aquatilis growth characteristics and ammonium uptake correlate with aboveground primary production? An ammonium uptake experiment was conducted on C. aquatilis roots, determining that deep roots took up equal if not greater amounts of ammonium than shallow roots. I also found that rooting depth was positively correlated with aboveground biomass, providing a plausible mechanism for increased N uptake post-thaw to impact aboveground plant productivity. en_US
dc.description.sponsorship NSERC (CGS-M) and NSTP en_US
dc.language.iso en en_US
dc.rights Attribution-NoDerivs 2.5 Canada *
dc.rights.uri http://creativecommons.org/licenses/by-nd/2.5/ca/ *
dc.subject permafrost thaw en_US
dc.subject permafrost carbon-climate feedback en_US
dc.subject nitrogen cycling en_US
dc.subject ammonium uptake en_US
dc.subject Carex aquatilis en_US
dc.title Are Plants Able to Utilize Nitrogen Released from Thawing Permafrost? Implications for Carbon Cycling and Feedback with the Climate System en_US
dc.type Thesis en_US
dc.degree.programme Integrative Biology en_US
dc.degree.name Master of Science en_US
dc.degree.department Department of Integrative Biology en_US
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Attribution-NoDerivs 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-NoDerivs 2.5 Canada