Changing sub-Arctic tundra vegetation upon permafrost degradation: impact on foliar mineral element cycling
Arctic warming and permafrost degradation are modifying northern ecosystems through changes in microtopography, soil water dynamics, nutrient availability, and vegetation succession. Upon permafrost degradation, the release of deep stores of nutrients, such as nitrogen and phosphorus, from newly tha...
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Online Access: | https://doi.org/10.5194/bg-19-2333-2022 https://bg.copernicus.org/articles/19/2333/2022/ |
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ftcopernicus:oai:publications.copernicus.org:bg98465 2023-05-15T14:48:26+02:00 Changing sub-Arctic tundra vegetation upon permafrost degradation: impact on foliar mineral element cycling Mauclet, Elisabeth Agnan, Yannick Hirst, Catherine Monhonval, Arthur Pereira, Benoît Vandeuren, Aubry Villani, Maëlle Ledman, Justin Taylor, Meghan Jasinski, Briana L. Schuur, Edward A. G. Opfergelt, Sophie 2022-05-05 application/pdf https://doi.org/10.5194/bg-19-2333-2022 https://bg.copernicus.org/articles/19/2333/2022/ eng eng doi:10.5194/bg-19-2333-2022 https://bg.copernicus.org/articles/19/2333/2022/ eISSN: 1726-4189 Text 2022 ftcopernicus https://doi.org/10.5194/bg-19-2333-2022 2022-05-09T16:22:28Z Arctic warming and permafrost degradation are modifying northern ecosystems through changes in microtopography, soil water dynamics, nutrient availability, and vegetation succession. Upon permafrost degradation, the release of deep stores of nutrients, such as nitrogen and phosphorus, from newly thawed permafrost stimulates Arctic vegetation production. More specifically, wetter lowlands show an increase in sedges (as part of graminoids), whereas drier uplands favor shrub expansion. These shifts in the composition of vegetation may influence local mineral element cycling through litter production. In this study, we evaluate the influence of permafrost degradation on mineral element foliar stocks and potential annual fluxes upon litterfall. We measured the foliar elemental composition (Al, Ca, Fe, K, Mn, P, S, Si, and Zn) of ∼ 500 samples of typical tundra plant species from two contrasting Alaskan tundra sites, i.e., an experimental sedge-dominated site (Carbon in Permafrost Experimental Heating Research, CiPEHR) and natural shrub-dominated site (Gradient). The foliar concentration of these mineral elements was species specific, with sedge leaves having relatively high Si concentration and shrub leaves having relatively high Ca and Mn concentrations. Therefore, changes in the species biomass composition of the Arctic tundra in response to permafrost thaw are expected to be the main factors that dictate changes in elemental composition of foliar stocks and maximum potential foliar fluxes upon litterfall. We observed an increase in the mineral element foliar stocks and potential annual litterfall fluxes, with Si increasing with sedge expansion in wetter sites (CiPEHR), and Ca and Mn increasing with shrub expansion in drier sites (Gradient). Consequently, we expect that sedge and shrub expansion upon permafrost thaw will lead to changes in litter elemental composition and therefore affect nutrient cycling across the sub-Arctic tundra with potential implications for further vegetation succession. Text Arctic permafrost Tundra Copernicus Publications: E-Journals Arctic Biogeosciences 19 9 2333 2351 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Arctic warming and permafrost degradation are modifying northern ecosystems through changes in microtopography, soil water dynamics, nutrient availability, and vegetation succession. Upon permafrost degradation, the release of deep stores of nutrients, such as nitrogen and phosphorus, from newly thawed permafrost stimulates Arctic vegetation production. More specifically, wetter lowlands show an increase in sedges (as part of graminoids), whereas drier uplands favor shrub expansion. These shifts in the composition of vegetation may influence local mineral element cycling through litter production. In this study, we evaluate the influence of permafrost degradation on mineral element foliar stocks and potential annual fluxes upon litterfall. We measured the foliar elemental composition (Al, Ca, Fe, K, Mn, P, S, Si, and Zn) of ∼ 500 samples of typical tundra plant species from two contrasting Alaskan tundra sites, i.e., an experimental sedge-dominated site (Carbon in Permafrost Experimental Heating Research, CiPEHR) and natural shrub-dominated site (Gradient). The foliar concentration of these mineral elements was species specific, with sedge leaves having relatively high Si concentration and shrub leaves having relatively high Ca and Mn concentrations. Therefore, changes in the species biomass composition of the Arctic tundra in response to permafrost thaw are expected to be the main factors that dictate changes in elemental composition of foliar stocks and maximum potential foliar fluxes upon litterfall. We observed an increase in the mineral element foliar stocks and potential annual litterfall fluxes, with Si increasing with sedge expansion in wetter sites (CiPEHR), and Ca and Mn increasing with shrub expansion in drier sites (Gradient). Consequently, we expect that sedge and shrub expansion upon permafrost thaw will lead to changes in litter elemental composition and therefore affect nutrient cycling across the sub-Arctic tundra with potential implications for further vegetation succession. |
format |
Text |
author |
Mauclet, Elisabeth Agnan, Yannick Hirst, Catherine Monhonval, Arthur Pereira, Benoît Vandeuren, Aubry Villani, Maëlle Ledman, Justin Taylor, Meghan Jasinski, Briana L. Schuur, Edward A. G. Opfergelt, Sophie |
spellingShingle |
Mauclet, Elisabeth Agnan, Yannick Hirst, Catherine Monhonval, Arthur Pereira, Benoît Vandeuren, Aubry Villani, Maëlle Ledman, Justin Taylor, Meghan Jasinski, Briana L. Schuur, Edward A. G. Opfergelt, Sophie Changing sub-Arctic tundra vegetation upon permafrost degradation: impact on foliar mineral element cycling |
author_facet |
Mauclet, Elisabeth Agnan, Yannick Hirst, Catherine Monhonval, Arthur Pereira, Benoît Vandeuren, Aubry Villani, Maëlle Ledman, Justin Taylor, Meghan Jasinski, Briana L. Schuur, Edward A. G. Opfergelt, Sophie |
author_sort |
Mauclet, Elisabeth |
title |
Changing sub-Arctic tundra vegetation upon permafrost degradation: impact on foliar mineral element cycling |
title_short |
Changing sub-Arctic tundra vegetation upon permafrost degradation: impact on foliar mineral element cycling |
title_full |
Changing sub-Arctic tundra vegetation upon permafrost degradation: impact on foliar mineral element cycling |
title_fullStr |
Changing sub-Arctic tundra vegetation upon permafrost degradation: impact on foliar mineral element cycling |
title_full_unstemmed |
Changing sub-Arctic tundra vegetation upon permafrost degradation: impact on foliar mineral element cycling |
title_sort |
changing sub-arctic tundra vegetation upon permafrost degradation: impact on foliar mineral element cycling |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-2333-2022 https://bg.copernicus.org/articles/19/2333/2022/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Tundra |
genre_facet |
Arctic permafrost Tundra |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-19-2333-2022 https://bg.copernicus.org/articles/19/2333/2022/ |
op_doi |
https://doi.org/10.5194/bg-19-2333-2022 |
container_title |
Biogeosciences |
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19 |
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9 |
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2333 |
op_container_end_page |
2351 |
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1766319499612520448 |