Contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil C and N stocks across a subarctic–alpine landscape
Global vegetation regimes vary in belowground carbon (C) and nitrogen (N) dynamics. However, disentangling large-scale climatic controls from the effects of intrinsic plant–soil–microbial feedbacks on belowground processes is challenging. In local gradients with similar pedo-climatic conditions, eff...
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Online Access: | https://hdl.handle.net/11250/3054298 https://doi.org/10.1111/nph.18679 |
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ftunivbergen:oai:bora.uib.no:11250/3054298 2023-05-15T18:28:13+02:00 Contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil C and N stocks across a subarctic–alpine landscape Castaño, Carles Hallin, Sara Egelkraut, Dagmar Dorothea Lindahl, Björn D. Olofsson, Johan Clemmensen, Karina Engelbrecht 2022 application/pdf https://hdl.handle.net/11250/3054298 https://doi.org/10.1111/nph.18679 eng eng Wiley urn:issn:0028-646X https://hdl.handle.net/11250/3054298 https://doi.org/10.1111/nph.18679 cristin:2106699 New Phytologist. 2022. Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no Copyright 2022 The Author(s) New Phytologist Journal article Peer reviewed 2022 ftunivbergen https://doi.org/10.1111/nph.18679 2023-03-14T17:43:07Z Global vegetation regimes vary in belowground carbon (C) and nitrogen (N) dynamics. However, disentangling large-scale climatic controls from the effects of intrinsic plant–soil–microbial feedbacks on belowground processes is challenging. In local gradients with similar pedo-climatic conditions, effects of plant–microbial feedbacks may be isolated from large-scale drivers. Across a subarctic–alpine mosaic of historic grazing fields and surrounding heath and birch forest, we evaluated whether vegetation-specific plant–microbial feedbacks involved contrasting N cycling characteristics and C and N stocks in the organic topsoil. We sequenced soil fungi, quantified functional genes within the inorganic N cycle, and measured 15N natural abundance. In grassland soils, large N stocks and low C : N ratios associated with fungal saprotrophs, archaeal ammonia oxidizers, and bacteria capable of respiratory ammonification, indicating maintained inorganic N cycling a century after abandoned reindeer grazing. Toward forest and heath, increasing abundance of mycorrhizal fungi co-occurred with transition to organic N cycling. However, ectomycorrhizal fungal decomposers correlated with small soil N and C stocks in forest, while root-associated ascomycetes associated with small N but large C stocks in heath, uncoupling C and N storage across vegetation types. We propose that contrasting, positive plant–microbial feedbacks stabilize vegetation trajectories, resulting in diverging soil C : N ratios at the landscape scale. publishedVersion Article in Journal/Newspaper Subarctic University of Bergen: Bergen Open Research Archive (BORA-UiB) New Phytologist |
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Open Polar |
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University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Global vegetation regimes vary in belowground carbon (C) and nitrogen (N) dynamics. However, disentangling large-scale climatic controls from the effects of intrinsic plant–soil–microbial feedbacks on belowground processes is challenging. In local gradients with similar pedo-climatic conditions, effects of plant–microbial feedbacks may be isolated from large-scale drivers. Across a subarctic–alpine mosaic of historic grazing fields and surrounding heath and birch forest, we evaluated whether vegetation-specific plant–microbial feedbacks involved contrasting N cycling characteristics and C and N stocks in the organic topsoil. We sequenced soil fungi, quantified functional genes within the inorganic N cycle, and measured 15N natural abundance. In grassland soils, large N stocks and low C : N ratios associated with fungal saprotrophs, archaeal ammonia oxidizers, and bacteria capable of respiratory ammonification, indicating maintained inorganic N cycling a century after abandoned reindeer grazing. Toward forest and heath, increasing abundance of mycorrhizal fungi co-occurred with transition to organic N cycling. However, ectomycorrhizal fungal decomposers correlated with small soil N and C stocks in forest, while root-associated ascomycetes associated with small N but large C stocks in heath, uncoupling C and N storage across vegetation types. We propose that contrasting, positive plant–microbial feedbacks stabilize vegetation trajectories, resulting in diverging soil C : N ratios at the landscape scale. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Castaño, Carles Hallin, Sara Egelkraut, Dagmar Dorothea Lindahl, Björn D. Olofsson, Johan Clemmensen, Karina Engelbrecht |
spellingShingle |
Castaño, Carles Hallin, Sara Egelkraut, Dagmar Dorothea Lindahl, Björn D. Olofsson, Johan Clemmensen, Karina Engelbrecht Contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil C and N stocks across a subarctic–alpine landscape |
author_facet |
Castaño, Carles Hallin, Sara Egelkraut, Dagmar Dorothea Lindahl, Björn D. Olofsson, Johan Clemmensen, Karina Engelbrecht |
author_sort |
Castaño, Carles |
title |
Contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil C and N stocks across a subarctic–alpine landscape |
title_short |
Contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil C and N stocks across a subarctic–alpine landscape |
title_full |
Contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil C and N stocks across a subarctic–alpine landscape |
title_fullStr |
Contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil C and N stocks across a subarctic–alpine landscape |
title_full_unstemmed |
Contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil C and N stocks across a subarctic–alpine landscape |
title_sort |
contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil c and n stocks across a subarctic–alpine landscape |
publisher |
Wiley |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3054298 https://doi.org/10.1111/nph.18679 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
New Phytologist |
op_relation |
urn:issn:0028-646X https://hdl.handle.net/11250/3054298 https://doi.org/10.1111/nph.18679 cristin:2106699 New Phytologist. 2022. |
op_rights |
Navngivelse-Ikkekommersiell 4.0 Internasjonal http://creativecommons.org/licenses/by-nc/4.0/deed.no Copyright 2022 The Author(s) |
op_doi |
https://doi.org/10.1111/nph.18679 |
container_title |
New Phytologist |
_version_ |
1766210613269233664 |