On growth patterns and mechanisms in arctic-alpine shrubs
Arctic-alpine ecosystems are considered hot-spots of environmental change, with rapidly warming conditions causing massive alterations in vegetational structure. These changes and their environmental controls are highly complex and variable across spatial and temporal scales. Yet, despite their nume...
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Universitäts- und Landesbibliothek Bonn
2022
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Online Access: | https://hdl.handle.net/20.500.11811/10518 |
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ftunivbonn:oai:bonndoc.ulb.uni-bonn.de:20.500.11811/10518 2023-07-02T03:31:23+02:00 On growth patterns and mechanisms in arctic-alpine shrubs Dobbert, Svenja Löffler, Jörg Pape, Roland 2022-12-12 application/pdf https://hdl.handle.net/20.500.11811/10518 eng eng Universitäts- und Landesbibliothek Bonn info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:5-68885 info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-19-1933-2022 https://hdl.handle.net/20.500.11811/10518 In Copyright http://rightsstatements.org/vocab/InC/1.0/ openAccess Arktisch-alpine Vegetationsveränderungen Dendrometer Physiologie Wachstumsmuster Norwegen Arctic-alpine vegetation change growth physiology climate-growth relations Norway ddc:550 doc-type:doctoralThesis 2022 ftunivbonn https://doi.org/20.500.11811/1051810.5194/bg-19-1933-2022 2023-06-11T22:07:46Z Arctic-alpine ecosystems are considered hot-spots of environmental change, with rapidly warming conditions causing massive alterations in vegetational structure. These changes and their environmental controls are highly complex and variable across spatial and temporal scales. Yet, despite their numerous implications for the global climate system, the underlying physiological processes and mechanisms at the individual plant scale are still little explored. Using, for the first time systematically and to a greater extent, hourly recordings of shrub stem diameter change provided by dendrometers, paired with on-site environmental conditions, enabled us to shed light on these processes. In this way, growth patterns in three widely distributed shrub species were assessed and linked to thermal and hygric conditions. Starting with a close examination of one evergreen species under extreme environmental conditions, followed by a comparison of evergreen and deciduous species, and, finally, a comparative look at growth patterns across local micro-habitats, our analysis revealed distinct growth strategies, closely linked to species-specific water-use dynamics and cambial rhythms. Within the heterogenous alpine landscape these conditions were mainly attributed to the variation in local micro-habitats, defined by fine-scale topography and consequent variation in snow conditions and exposure. Thus, the overall growth success was mainly controlled by complex seasonal dynamics of soil moisture availability, snow conditions, and associated freeze–thaw cycles and was therefore in many cases decoupled from governing regional climate signals. At the same time, exceedingly high summer temperatures were limiting shrub growth during the main growing season, resulting in more or less pronounced bimodal growth patterns, indicating potential growth limitation with on-going summer warming. While shrubs are currently able to maximize their growth success through a high level of adaptation to local micro-site conditions, their continued ... Doctoral or Postdoctoral Thesis Arctic Arktis* bonndoc - The Repository of the University of Bonn Arctic Norway Biogeosciences 19 7 1933 1958 |
institution |
Open Polar |
collection |
bonndoc - The Repository of the University of Bonn |
op_collection_id |
ftunivbonn |
language |
English |
topic |
Arktisch-alpine Vegetationsveränderungen Dendrometer Physiologie Wachstumsmuster Norwegen Arctic-alpine vegetation change growth physiology climate-growth relations Norway ddc:550 |
spellingShingle |
Arktisch-alpine Vegetationsveränderungen Dendrometer Physiologie Wachstumsmuster Norwegen Arctic-alpine vegetation change growth physiology climate-growth relations Norway ddc:550 Dobbert, Svenja On growth patterns and mechanisms in arctic-alpine shrubs |
topic_facet |
Arktisch-alpine Vegetationsveränderungen Dendrometer Physiologie Wachstumsmuster Norwegen Arctic-alpine vegetation change growth physiology climate-growth relations Norway ddc:550 |
description |
Arctic-alpine ecosystems are considered hot-spots of environmental change, with rapidly warming conditions causing massive alterations in vegetational structure. These changes and their environmental controls are highly complex and variable across spatial and temporal scales. Yet, despite their numerous implications for the global climate system, the underlying physiological processes and mechanisms at the individual plant scale are still little explored. Using, for the first time systematically and to a greater extent, hourly recordings of shrub stem diameter change provided by dendrometers, paired with on-site environmental conditions, enabled us to shed light on these processes. In this way, growth patterns in three widely distributed shrub species were assessed and linked to thermal and hygric conditions. Starting with a close examination of one evergreen species under extreme environmental conditions, followed by a comparison of evergreen and deciduous species, and, finally, a comparative look at growth patterns across local micro-habitats, our analysis revealed distinct growth strategies, closely linked to species-specific water-use dynamics and cambial rhythms. Within the heterogenous alpine landscape these conditions were mainly attributed to the variation in local micro-habitats, defined by fine-scale topography and consequent variation in snow conditions and exposure. Thus, the overall growth success was mainly controlled by complex seasonal dynamics of soil moisture availability, snow conditions, and associated freeze–thaw cycles and was therefore in many cases decoupled from governing regional climate signals. At the same time, exceedingly high summer temperatures were limiting shrub growth during the main growing season, resulting in more or less pronounced bimodal growth patterns, indicating potential growth limitation with on-going summer warming. While shrubs are currently able to maximize their growth success through a high level of adaptation to local micro-site conditions, their continued ... |
author2 |
Löffler, Jörg Pape, Roland |
format |
Doctoral or Postdoctoral Thesis |
author |
Dobbert, Svenja |
author_facet |
Dobbert, Svenja |
author_sort |
Dobbert, Svenja |
title |
On growth patterns and mechanisms in arctic-alpine shrubs |
title_short |
On growth patterns and mechanisms in arctic-alpine shrubs |
title_full |
On growth patterns and mechanisms in arctic-alpine shrubs |
title_fullStr |
On growth patterns and mechanisms in arctic-alpine shrubs |
title_full_unstemmed |
On growth patterns and mechanisms in arctic-alpine shrubs |
title_sort |
on growth patterns and mechanisms in arctic-alpine shrubs |
publisher |
Universitäts- und Landesbibliothek Bonn |
publishDate |
2022 |
url |
https://hdl.handle.net/20.500.11811/10518 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic Arktis* |
genre_facet |
Arctic Arktis* |
op_relation |
info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:5-68885 info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-19-1933-2022 https://hdl.handle.net/20.500.11811/10518 |
op_rights |
In Copyright http://rightsstatements.org/vocab/InC/1.0/ openAccess |
op_doi |
https://doi.org/20.500.11811/1051810.5194/bg-19-1933-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
7 |
container_start_page |
1933 |
op_container_end_page |
1958 |
_version_ |
1770270783061360640 |