Common mechanisms explain nitrogen-dependent growth of Arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability
Heterogeneity has been observed in the responses of Arctic shrubs to climate variability over recent decades, which may reflect landscape-scale variability in belowground resources. At a northern fringe of tall shrub expansion (Yuribei, Yamal Peninsula, Russia), we sought to determine the mechanisms...
Published in: | New Phytologist |
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2021
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Online Access: | https://research.ulapland.fi/fi/publications/eb42adb8-b439-40a7-aac6-8a6fde359b83 https://doi.org/10.1111/nph.17529 http://www.scopus.com/inward/record.url?scp=85110972307&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85110972307&partnerID=8YFLogxK |
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ftulaplandcdispu:oai:lacris.ulapland.fi:publications/eb42adb8-b439-40a7-aac6-8a6fde359b83 2024-05-12T07:57:26+00:00 Common mechanisms explain nitrogen-dependent growth of Arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability Martin, Andrew C. Macias-Fauria, Marc Bonsall, Michael B. Forbes, Bruce C. Zetterberg, Pentti Jeffers, Elizabeth S. 2021-07-04 https://research.ulapland.fi/fi/publications/eb42adb8-b439-40a7-aac6-8a6fde359b83 https://doi.org/10.1111/nph.17529 http://www.scopus.com/inward/record.url?scp=85110972307&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85110972307&partnerID=8YFLogxK eng eng https://research.ulapland.fi/fi/publications/eb42adb8-b439-40a7-aac6-8a6fde359b83 info:eu-repo/semantics/openAccess Martin , A C , Macias-Fauria , M , Bonsall , M B , Forbes , B C , Zetterberg , P & Jeffers , E S 2021 , ' Common mechanisms explain nitrogen-dependent growth of Arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability ' , New Phytologist , pp. 1-17 . https://doi.org/10.1111/nph.17529 Arctic greening dendroecology model-fitting model-selection nitrogen limitation ordinary differential equations plant–resource coupling Salix lanata stable isotopes /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences article 2021 ftulaplandcdispu https://doi.org/10.1111/nph.17529 2024-04-14T23:46:20Z Heterogeneity has been observed in the responses of Arctic shrubs to climate variability over recent decades, which may reflect landscape-scale variability in belowground resources. At a northern fringe of tall shrub expansion (Yuribei, Yamal Peninsula, Russia), we sought to determine the mechanisms relating nitrogen (N) limitation to shrub growth over decadal time. We analysed the ratio of 15 N to 14 N isotopes in wood rings of 10 Salix lanata individuals (399 measurements) to reconstruct annual point-based bioavailable N between 1980 and 2013. We applied a model-fitting/model-selection approach with a suite of competing ecological models to assess the most-likely mechanisms that explain each shrub’s individual time-series. Shrub δ 15 N time-series indicated declining (seven shrubs), increasing (two shrubs) and no trend (one shrub) in N availability. The most appropriate model for all shrubs included N-dependent growth of linear rather than saturating form. Inclusion of plant–soil feedbacks better explained ring width and δ 15 N for eight of 10 individuals. Although N trajectories were individualistic, common mechanisms of varying strength confirmed the N-dependency of shrub growth. The linear mechanism may reflect intense scavenging of scarce N; the importance of plant–soil feedbacks suggests that shrubs subvert the microbial bottleneck by actively controlling their environment. Article in Journal/Newspaper Arctic Arctic Greening Arctic Salix lanata Yamal Peninsula LaCRIS - University of Lapland Current Research System Arctic Yamal Peninsula ENVELOPE(69.873,69.873,70.816,70.816) New Phytologist 233 2 670 686 |
institution |
Open Polar |
collection |
LaCRIS - University of Lapland Current Research System |
op_collection_id |
ftulaplandcdispu |
language |
English |
topic |
Arctic greening dendroecology model-fitting model-selection nitrogen limitation ordinary differential equations plant–resource coupling Salix lanata stable isotopes /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences |
spellingShingle |
Arctic greening dendroecology model-fitting model-selection nitrogen limitation ordinary differential equations plant–resource coupling Salix lanata stable isotopes /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences Martin, Andrew C. Macias-Fauria, Marc Bonsall, Michael B. Forbes, Bruce C. Zetterberg, Pentti Jeffers, Elizabeth S. Common mechanisms explain nitrogen-dependent growth of Arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability |
topic_facet |
Arctic greening dendroecology model-fitting model-selection nitrogen limitation ordinary differential equations plant–resource coupling Salix lanata stable isotopes /dk/atira/pure/person/fieldofscience2010/1/17/1 name=Geosciences |
description |
Heterogeneity has been observed in the responses of Arctic shrubs to climate variability over recent decades, which may reflect landscape-scale variability in belowground resources. At a northern fringe of tall shrub expansion (Yuribei, Yamal Peninsula, Russia), we sought to determine the mechanisms relating nitrogen (N) limitation to shrub growth over decadal time. We analysed the ratio of 15 N to 14 N isotopes in wood rings of 10 Salix lanata individuals (399 measurements) to reconstruct annual point-based bioavailable N between 1980 and 2013. We applied a model-fitting/model-selection approach with a suite of competing ecological models to assess the most-likely mechanisms that explain each shrub’s individual time-series. Shrub δ 15 N time-series indicated declining (seven shrubs), increasing (two shrubs) and no trend (one shrub) in N availability. The most appropriate model for all shrubs included N-dependent growth of linear rather than saturating form. Inclusion of plant–soil feedbacks better explained ring width and δ 15 N for eight of 10 individuals. Although N trajectories were individualistic, common mechanisms of varying strength confirmed the N-dependency of shrub growth. The linear mechanism may reflect intense scavenging of scarce N; the importance of plant–soil feedbacks suggests that shrubs subvert the microbial bottleneck by actively controlling their environment. |
format |
Article in Journal/Newspaper |
author |
Martin, Andrew C. Macias-Fauria, Marc Bonsall, Michael B. Forbes, Bruce C. Zetterberg, Pentti Jeffers, Elizabeth S. |
author_facet |
Martin, Andrew C. Macias-Fauria, Marc Bonsall, Michael B. Forbes, Bruce C. Zetterberg, Pentti Jeffers, Elizabeth S. |
author_sort |
Martin, Andrew C. |
title |
Common mechanisms explain nitrogen-dependent growth of Arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability |
title_short |
Common mechanisms explain nitrogen-dependent growth of Arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability |
title_full |
Common mechanisms explain nitrogen-dependent growth of Arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability |
title_fullStr |
Common mechanisms explain nitrogen-dependent growth of Arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability |
title_full_unstemmed |
Common mechanisms explain nitrogen-dependent growth of Arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability |
title_sort |
common mechanisms explain nitrogen-dependent growth of arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability |
publishDate |
2021 |
url |
https://research.ulapland.fi/fi/publications/eb42adb8-b439-40a7-aac6-8a6fde359b83 https://doi.org/10.1111/nph.17529 http://www.scopus.com/inward/record.url?scp=85110972307&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85110972307&partnerID=8YFLogxK |
long_lat |
ENVELOPE(69.873,69.873,70.816,70.816) |
geographic |
Arctic Yamal Peninsula |
geographic_facet |
Arctic Yamal Peninsula |
genre |
Arctic Arctic Greening Arctic Salix lanata Yamal Peninsula |
genre_facet |
Arctic Arctic Greening Arctic Salix lanata Yamal Peninsula |
op_source |
Martin , A C , Macias-Fauria , M , Bonsall , M B , Forbes , B C , Zetterberg , P & Jeffers , E S 2021 , ' Common mechanisms explain nitrogen-dependent growth of Arctic shrubs over three decades despite heterogeneous trends and declines in soil nitrogen availability ' , New Phytologist , pp. 1-17 . https://doi.org/10.1111/nph.17529 |
op_relation |
https://research.ulapland.fi/fi/publications/eb42adb8-b439-40a7-aac6-8a6fde359b83 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/nph.17529 |
container_title |
New Phytologist |
container_volume |
233 |
container_issue |
2 |
container_start_page |
670 |
op_container_end_page |
686 |
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1798837771345854464 |