Are Plants Able to Utilize Nitrogen Released from Thawing Permafrost? Implications for Carbon Cycling and Feedback with the Climate System
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; howe...
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University of Guelph
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ftunivguelph:oai:atrium.lib.uoguelph.ca:10214/12987 2024-06-23T07:52:04+00:00 Are Plants Able to Utilize Nitrogen Released from Thawing Permafrost? Implications for Carbon Cycling and Feedback with the Climate System Albano, Lucas Jacob Turetsky, Merritt 2018-05-07 application/pdf http://hdl.handle.net/10214/12987 en eng University of Guelph http://hdl.handle.net/10214/12987 Attribution-NoDerivs 2.5 Canada http://creativecommons.org/licenses/by-nd/2.5/ca/ permafrost thaw permafrost carbon-climate feedback nitrogen cycling ammonium uptake Carex aquatilis Thesis 2018 ftunivguelph 2024-06-04T23:59:50Z 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. Natural Sciences and Engineering Research Council of Canada Northern Scientific Training Program Thesis Carex aquatilis permafrost Thermokarst Alaska University of Guelph: DSpace digital archive Canada |
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Open Polar |
collection |
University of Guelph: DSpace digital archive |
op_collection_id |
ftunivguelph |
language |
English |
topic |
permafrost thaw permafrost carbon-climate feedback nitrogen cycling ammonium uptake Carex aquatilis |
spellingShingle |
permafrost thaw permafrost carbon-climate feedback nitrogen cycling ammonium uptake Carex aquatilis Albano, Lucas Jacob Are Plants Able to Utilize Nitrogen Released from Thawing Permafrost? Implications for Carbon Cycling and Feedback with the Climate System |
topic_facet |
permafrost thaw permafrost carbon-climate feedback nitrogen cycling ammonium uptake Carex aquatilis |
description |
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. Natural Sciences and Engineering Research Council of Canada Northern Scientific Training Program |
author2 |
Turetsky, Merritt |
format |
Thesis |
author |
Albano, Lucas Jacob |
author_facet |
Albano, Lucas Jacob |
author_sort |
Albano, Lucas Jacob |
title |
Are Plants Able to Utilize Nitrogen Released from Thawing Permafrost? Implications for Carbon Cycling and Feedback with the Climate System |
title_short |
Are Plants Able to Utilize Nitrogen Released from Thawing Permafrost? Implications for Carbon Cycling and Feedback with the Climate System |
title_full |
Are Plants Able to Utilize Nitrogen Released from Thawing Permafrost? Implications for Carbon Cycling and Feedback with the Climate System |
title_fullStr |
Are Plants Able to Utilize Nitrogen Released from Thawing Permafrost? Implications for Carbon Cycling and Feedback with the Climate System |
title_full_unstemmed |
Are Plants Able to Utilize Nitrogen Released from Thawing Permafrost? Implications for Carbon Cycling and Feedback with the Climate System |
title_sort |
are plants able to utilize nitrogen released from thawing permafrost? implications for carbon cycling and feedback with the climate system |
publisher |
University of Guelph |
publishDate |
2018 |
url |
http://hdl.handle.net/10214/12987 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Carex aquatilis permafrost Thermokarst Alaska |
genre_facet |
Carex aquatilis permafrost Thermokarst Alaska |
op_relation |
http://hdl.handle.net/10214/12987 |
op_rights |
Attribution-NoDerivs 2.5 Canada http://creativecommons.org/licenses/by-nd/2.5/ca/ |
_version_ |
1802643275502321664 |