Arctic shrub growth trajectories differ across soil moisture levels
Abstract The circumpolar expansion of woody deciduous shrubs in arctic tundra alters key ecosystem properties including carbon balance and hydrology. However, landscape‐scale patterns and drivers of shrub expansion remain poorly understood, inhibiting accurate incorporation of shrub effects into cli...
Published in: | Global Change Biology |
---|---|
Main Authors: | , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2017
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/gcb.13677 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.13677 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.13677 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.13677 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/gcb.13677 |
id |
crwiley:10.1111/gcb.13677 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/gcb.13677 2024-09-30T14:30:48+00:00 Arctic shrub growth trajectories differ across soil moisture levels Ackerman, Daniel Griffin, Daniel Hobbie, Sarah E. Finlay, Jacques C. National Science Foundation Explorers Club 2017 http://dx.doi.org/10.1111/gcb.13677 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.13677 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.13677 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.13677 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/gcb.13677 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 23, issue 10, page 4294-4302 ISSN 1354-1013 1365-2486 journal-article 2017 crwiley https://doi.org/10.1111/gcb.13677 2024-09-05T05:07:24Z Abstract The circumpolar expansion of woody deciduous shrubs in arctic tundra alters key ecosystem properties including carbon balance and hydrology. However, landscape‐scale patterns and drivers of shrub expansion remain poorly understood, inhibiting accurate incorporation of shrub effects into climate models. Here, we use dendroecology to elucidate the role of soil moisture in modifying the relationship between climate and growth for a dominant deciduous shrub, Salix pulchra , on the North Slope of Alaska, USA . We improve upon previous modeling approaches by using ecological theory to guide model selection for the relationship between climate and shrub growth. Finally, we present novel dendroecology‐based estimates of shrub biomass change under a future climate regime, made possible by recently developed shrub allometry models. We find that S. pulchra growth has responded positively to mean June temperature over the past 2.5 decades at both a dry upland tundra site and an adjacent mesic riparian site. For the upland site, including a negative second‐order term in the climate–growth model significantly improved explanatory power, matching theoretical predictions of diminishing growth returns to increasing temperature. A first‐order linear model fit best at the riparian site, indicating consistent growth increases in response to sustained warming, possibly due to lack of temperature‐induced moisture limitation in mesic habitats. These contrasting results indicate that S. pulchra in mesic habitats may respond positively to a wider range of temperature increase than S. pulchra in dry habitats. Lastly, we estimate that a 2°C increase in current mean June temperature will yield a 19% increase in aboveground S. pulchra biomass at the upland site and a 36% increase at the riparian site. Our method of biomass estimation provides an important link toward incorporating dendroecology data into coupled vegetation and climate models. Article in Journal/Newspaper Arctic north slope Tundra Alaska Wiley Online Library Arctic Global Change Biology 23 10 4294 4302 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The circumpolar expansion of woody deciduous shrubs in arctic tundra alters key ecosystem properties including carbon balance and hydrology. However, landscape‐scale patterns and drivers of shrub expansion remain poorly understood, inhibiting accurate incorporation of shrub effects into climate models. Here, we use dendroecology to elucidate the role of soil moisture in modifying the relationship between climate and growth for a dominant deciduous shrub, Salix pulchra , on the North Slope of Alaska, USA . We improve upon previous modeling approaches by using ecological theory to guide model selection for the relationship between climate and shrub growth. Finally, we present novel dendroecology‐based estimates of shrub biomass change under a future climate regime, made possible by recently developed shrub allometry models. We find that S. pulchra growth has responded positively to mean June temperature over the past 2.5 decades at both a dry upland tundra site and an adjacent mesic riparian site. For the upland site, including a negative second‐order term in the climate–growth model significantly improved explanatory power, matching theoretical predictions of diminishing growth returns to increasing temperature. A first‐order linear model fit best at the riparian site, indicating consistent growth increases in response to sustained warming, possibly due to lack of temperature‐induced moisture limitation in mesic habitats. These contrasting results indicate that S. pulchra in mesic habitats may respond positively to a wider range of temperature increase than S. pulchra in dry habitats. Lastly, we estimate that a 2°C increase in current mean June temperature will yield a 19% increase in aboveground S. pulchra biomass at the upland site and a 36% increase at the riparian site. Our method of biomass estimation provides an important link toward incorporating dendroecology data into coupled vegetation and climate models. |
author2 |
National Science Foundation Explorers Club |
format |
Article in Journal/Newspaper |
author |
Ackerman, Daniel Griffin, Daniel Hobbie, Sarah E. Finlay, Jacques C. |
spellingShingle |
Ackerman, Daniel Griffin, Daniel Hobbie, Sarah E. Finlay, Jacques C. Arctic shrub growth trajectories differ across soil moisture levels |
author_facet |
Ackerman, Daniel Griffin, Daniel Hobbie, Sarah E. Finlay, Jacques C. |
author_sort |
Ackerman, Daniel |
title |
Arctic shrub growth trajectories differ across soil moisture levels |
title_short |
Arctic shrub growth trajectories differ across soil moisture levels |
title_full |
Arctic shrub growth trajectories differ across soil moisture levels |
title_fullStr |
Arctic shrub growth trajectories differ across soil moisture levels |
title_full_unstemmed |
Arctic shrub growth trajectories differ across soil moisture levels |
title_sort |
arctic shrub growth trajectories differ across soil moisture levels |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/gcb.13677 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.13677 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.13677 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.13677 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/gcb.13677 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic north slope Tundra Alaska |
genre_facet |
Arctic north slope Tundra Alaska |
op_source |
Global Change Biology volume 23, issue 10, page 4294-4302 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gcb.13677 |
container_title |
Global Change Biology |
container_volume |
23 |
container_issue |
10 |
container_start_page |
4294 |
op_container_end_page |
4302 |
_version_ |
1811635593379053568 |