Tracing changes in base cation sources for Arctic tundra vegetation upon permafrost thaw
Upon permafrost thaw, the volume of soil accessible to plant roots increases which modifies the acquisition of plant-available resources. Tundra vegetation is actively responding to the changing environment with two major directions for vegetation shift across the Arctic: the expansion of deep-roote...
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2023
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Online Access: | http://hdl.handle.net/2078.1/268698 https://doi.org/10.1016/j.geoderma.2022.116277 |
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:268698 2024-05-12T07:52:21+00:00 Tracing changes in base cation sources for Arctic tundra vegetation upon permafrost thaw Mauclet, Elisabeth Hirst, Catherine Monhonval, Arthur Stevenson, Emily Gérard, Merlin Villani, Maëlle Dailly, Hélène Schuur, Edward Opfergelt, Sophie UCL - SST/ELI/ELIE - Environmental Sciences 2023 http://hdl.handle.net/2078.1/268698 https://doi.org/10.1016/j.geoderma.2022.116277 eng eng Elsevier BV info:eu-repo/grantAgreement/European Research Council (ERC)/European Union’s Horizon 2020 research and innovation programme/WeThaw boreal:268698 http://hdl.handle.net/2078.1/268698 doi:10.1016/j.geoderma.2022.116277 urn:ISSN:0016-7061 urn:EISSN:1872-6259 info:eu-repo/semantics/openAccess Geoderma, Vol. 429, no.429, p. 116277 (2022) Plant nutrient source Arctic tundra Rooting depth Radiogenic Sr isotopes Alaska Eight Mile Lake info:eu-repo/semantics/article 2023 ftunistlouisbrus https://doi.org/10.1016/j.geoderma.2022.116277 2024-04-18T17:09:55Z Upon permafrost thaw, the volume of soil accessible to plant roots increases which modifies the acquisition of plant-available resources. Tundra vegetation is actively responding to the changing environment with two major directions for vegetation shift across the Arctic: the expansion of deep-rooted sedges and the widespread increase in shallow-rooted shrubs. Changes in vegetation composition, density and distribution have large implications on the Arctic warming and permafrost stability by influencing the albedo, the snow accumulation and the litter decomposition rate. A better understanding of these cumulated effects of changing vegetation on warming and permafrost requires assessing the changes in plant nutrient sources upon permafrost thaw, nutrient access being a limiting factor for the Arctic tundra vegetation development. In this study, we determined the influence of permafrost degradation on the base cation sources for plant uptake by using the radiogenic Sr isotope ratio as a tracer of source, along a permafrost thaw gradient at Eight Mile Lake in Interior Alaska (USA). As plants take up Sr from the exchangeable soil fraction with no measurable fractionation, we determined the differences in 87Sr/86Sr ratio of the exchangeable Sr between shallow and deeper soil horizons, and we compared the 87Sr/86Sr ratio of foliar samples for three Arctic tundra species with contrasted rooting depths (Betula nana, Vaccinium vitisidaea, and Eriophorum vaginatum) upon different permafrost thaw conditions. The higher foliar 87Sr/86Sr ratios of shallow-rooted Arctic tundra shrubs (B. nana, V. vitis-idaea) was consistent with a shallow source of soil exchangeable Sr from surface soil horizons, whereas the lower foliar 87Sr/86Sr ratios of deep-rooted Arctic tundra sedges (E. vaginatum) reflected a source of Sr from deeper soil horizons. There is a shift between poorly and highly thawed soil profiles towards lower foliar 87Sr/86Sr ratios in both deep- and shallow-rooted plant species. This shift supports that ... Article in Journal/Newspaper albedo Arctic Betula nana Eriophorum permafrost Tundra Alaska DIAL@USL-B (Université Saint-Louis, Bruxelles) Arctic Geoderma 429 116277 |
institution |
Open Polar |
collection |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
op_collection_id |
ftunistlouisbrus |
language |
English |
topic |
Plant nutrient source Arctic tundra Rooting depth Radiogenic Sr isotopes Alaska Eight Mile Lake |
spellingShingle |
Plant nutrient source Arctic tundra Rooting depth Radiogenic Sr isotopes Alaska Eight Mile Lake Mauclet, Elisabeth Hirst, Catherine Monhonval, Arthur Stevenson, Emily Gérard, Merlin Villani, Maëlle Dailly, Hélène Schuur, Edward Opfergelt, Sophie Tracing changes in base cation sources for Arctic tundra vegetation upon permafrost thaw |
topic_facet |
Plant nutrient source Arctic tundra Rooting depth Radiogenic Sr isotopes Alaska Eight Mile Lake |
description |
Upon permafrost thaw, the volume of soil accessible to plant roots increases which modifies the acquisition of plant-available resources. Tundra vegetation is actively responding to the changing environment with two major directions for vegetation shift across the Arctic: the expansion of deep-rooted sedges and the widespread increase in shallow-rooted shrubs. Changes in vegetation composition, density and distribution have large implications on the Arctic warming and permafrost stability by influencing the albedo, the snow accumulation and the litter decomposition rate. A better understanding of these cumulated effects of changing vegetation on warming and permafrost requires assessing the changes in plant nutrient sources upon permafrost thaw, nutrient access being a limiting factor for the Arctic tundra vegetation development. In this study, we determined the influence of permafrost degradation on the base cation sources for plant uptake by using the radiogenic Sr isotope ratio as a tracer of source, along a permafrost thaw gradient at Eight Mile Lake in Interior Alaska (USA). As plants take up Sr from the exchangeable soil fraction with no measurable fractionation, we determined the differences in 87Sr/86Sr ratio of the exchangeable Sr between shallow and deeper soil horizons, and we compared the 87Sr/86Sr ratio of foliar samples for three Arctic tundra species with contrasted rooting depths (Betula nana, Vaccinium vitisidaea, and Eriophorum vaginatum) upon different permafrost thaw conditions. The higher foliar 87Sr/86Sr ratios of shallow-rooted Arctic tundra shrubs (B. nana, V. vitis-idaea) was consistent with a shallow source of soil exchangeable Sr from surface soil horizons, whereas the lower foliar 87Sr/86Sr ratios of deep-rooted Arctic tundra sedges (E. vaginatum) reflected a source of Sr from deeper soil horizons. There is a shift between poorly and highly thawed soil profiles towards lower foliar 87Sr/86Sr ratios in both deep- and shallow-rooted plant species. This shift supports that ... |
author2 |
UCL - SST/ELI/ELIE - Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Mauclet, Elisabeth Hirst, Catherine Monhonval, Arthur Stevenson, Emily Gérard, Merlin Villani, Maëlle Dailly, Hélène Schuur, Edward Opfergelt, Sophie |
author_facet |
Mauclet, Elisabeth Hirst, Catherine Monhonval, Arthur Stevenson, Emily Gérard, Merlin Villani, Maëlle Dailly, Hélène Schuur, Edward Opfergelt, Sophie |
author_sort |
Mauclet, Elisabeth |
title |
Tracing changes in base cation sources for Arctic tundra vegetation upon permafrost thaw |
title_short |
Tracing changes in base cation sources for Arctic tundra vegetation upon permafrost thaw |
title_full |
Tracing changes in base cation sources for Arctic tundra vegetation upon permafrost thaw |
title_fullStr |
Tracing changes in base cation sources for Arctic tundra vegetation upon permafrost thaw |
title_full_unstemmed |
Tracing changes in base cation sources for Arctic tundra vegetation upon permafrost thaw |
title_sort |
tracing changes in base cation sources for arctic tundra vegetation upon permafrost thaw |
publisher |
Elsevier BV |
publishDate |
2023 |
url |
http://hdl.handle.net/2078.1/268698 https://doi.org/10.1016/j.geoderma.2022.116277 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
albedo Arctic Betula nana Eriophorum permafrost Tundra Alaska |
genre_facet |
albedo Arctic Betula nana Eriophorum permafrost Tundra Alaska |
op_source |
Geoderma, Vol. 429, no.429, p. 116277 (2022) |
op_relation |
info:eu-repo/grantAgreement/European Research Council (ERC)/European Union’s Horizon 2020 research and innovation programme/WeThaw boreal:268698 http://hdl.handle.net/2078.1/268698 doi:10.1016/j.geoderma.2022.116277 urn:ISSN:0016-7061 urn:EISSN:1872-6259 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.geoderma.2022.116277 |
container_title |
Geoderma |
container_volume |
429 |
container_start_page |
116277 |
_version_ |
1798855111110295552 |