Vegetation and carbon dynamics of high-latitude peatlands in a changing climate : from early Holocene to recent past
The high-latitudes are warming at more than twice the rate of the global average. Warming and the consequent changes in hydrology affect peatland functioning, especially through changes in vegetation and carbon dynamics. The majority of the world’s peatlands are found in the Northern Hemisphere, for...
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2022
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/348340 2023-09-05T13:20:52+02:00 Vegetation and carbon dynamics of high-latitude peatlands in a changing climate : from early Holocene to recent past Piilo, Sanna Belyea, Lisa University of Helsinki, Faculty of Biological and Environmental Sciences Doctoral Programme in Interdisciplinary Environmental Sciences Helsingin yliopisto, bio- ja ympäristötieteellinen tiedekunta Ympäristöalan tieteidenvälinen tohtoriohjelma Helsingfors universitet, bio- och miljövetenskapliga fakulteten Doktorandprogrammet i tvärvetenskaplig miljöforskning Väliranta, Minna 2022-09-23T11:45:03Z application/pdf http://hdl.handle.net/10138/348340 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-951-51-8541-9 Helsinki: 2022, Dissertationes Schola Doctoralis Scientiae Circumiectalis, Alimentariae, Biologicae. 2342-5423 Dissertationes Schola Doctoralis Scientiae Circumiectalis, Alimentariae, Biologicae URN:ISSN:2342-5431 http://hdl.handle.net/10138/348340 URN:ISBN:978-951-51-8542-6 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. ympäristötieteet Text 1171 Geotieteet 1172 Ympäristötiede 119 Muut luonnontieteet 1171 Geovetenskaper 1172 Miljövetenskap 119 Övrig naturvetenskap 1171 Geosciences 1172 Environmental sciences 119 Other natural sciences Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2022 ftunivhelsihelda 2023-08-16T23:00:08Z The high-latitudes are warming at more than twice the rate of the global average. Warming and the consequent changes in hydrology affect peatland functioning, especially through changes in vegetation and carbon dynamics. The majority of the world’s peatlands are found in the Northern Hemisphere, forming a globally significant carbon storage and they are in constant interaction with the atmosphere through carbon uptake and release. The global importance of peatlands is widely recognised; however, the role played by high-latitude peatlands in changing climates is still unclear. It is not thoroughly understood how warmer future climates and hydrological changes will affect peatland vegetation and carbon processes. These uncertainties result from the complexity of peatlands and from the manifold future trajectories that are affected by different forcing factors from climate to local conditions. In this dissertation, I aim to increase our knowledge of high-latitude peatland vegetation and carbon dynamics under changing climatic conditions. My approach is palaeoecological, because I use peat records as an archive to reconstruct the response of high-latitude peatlands to known changes in climate. Peatlands function as important archives, since under anoxic and acidic conditions, peat-forming plant remains are well preserved. By identifying these plant remains, we can reconstruct past vegetation compositions. The various peat-forming plants have their own ecological niche, since they prefer and require specific hydrological or nutritional conditions and thus are good indicators for past hydrological changes and conditions. For this dissertation, I collected, in total, 47 peat records from eastern Canada, northern Sweden and Finland, the Kola Peninsula and the northeast of European Russia. I investigated how peatland habitats, carbon accumulation and cycling of our study sites have changed in response to changes in climate. For this, I used plant macrofossils, peat geochemical measurements and dating methods. In ... Doctoral or Postdoctoral Thesis kola peninsula Northern Sweden Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Kola Peninsula Canada |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
ympäristötieteet |
spellingShingle |
ympäristötieteet Piilo, Sanna Vegetation and carbon dynamics of high-latitude peatlands in a changing climate : from early Holocene to recent past |
topic_facet |
ympäristötieteet |
description |
The high-latitudes are warming at more than twice the rate of the global average. Warming and the consequent changes in hydrology affect peatland functioning, especially through changes in vegetation and carbon dynamics. The majority of the world’s peatlands are found in the Northern Hemisphere, forming a globally significant carbon storage and they are in constant interaction with the atmosphere through carbon uptake and release. The global importance of peatlands is widely recognised; however, the role played by high-latitude peatlands in changing climates is still unclear. It is not thoroughly understood how warmer future climates and hydrological changes will affect peatland vegetation and carbon processes. These uncertainties result from the complexity of peatlands and from the manifold future trajectories that are affected by different forcing factors from climate to local conditions. In this dissertation, I aim to increase our knowledge of high-latitude peatland vegetation and carbon dynamics under changing climatic conditions. My approach is palaeoecological, because I use peat records as an archive to reconstruct the response of high-latitude peatlands to known changes in climate. Peatlands function as important archives, since under anoxic and acidic conditions, peat-forming plant remains are well preserved. By identifying these plant remains, we can reconstruct past vegetation compositions. The various peat-forming plants have their own ecological niche, since they prefer and require specific hydrological or nutritional conditions and thus are good indicators for past hydrological changes and conditions. For this dissertation, I collected, in total, 47 peat records from eastern Canada, northern Sweden and Finland, the Kola Peninsula and the northeast of European Russia. I investigated how peatland habitats, carbon accumulation and cycling of our study sites have changed in response to changes in climate. For this, I used plant macrofossils, peat geochemical measurements and dating methods. In ... |
author2 |
Belyea, Lisa University of Helsinki, Faculty of Biological and Environmental Sciences Doctoral Programme in Interdisciplinary Environmental Sciences Helsingin yliopisto, bio- ja ympäristötieteellinen tiedekunta Ympäristöalan tieteidenvälinen tohtoriohjelma Helsingfors universitet, bio- och miljövetenskapliga fakulteten Doktorandprogrammet i tvärvetenskaplig miljöforskning Väliranta, Minna |
format |
Doctoral or Postdoctoral Thesis |
author |
Piilo, Sanna |
author_facet |
Piilo, Sanna |
author_sort |
Piilo, Sanna |
title |
Vegetation and carbon dynamics of high-latitude peatlands in a changing climate : from early Holocene to recent past |
title_short |
Vegetation and carbon dynamics of high-latitude peatlands in a changing climate : from early Holocene to recent past |
title_full |
Vegetation and carbon dynamics of high-latitude peatlands in a changing climate : from early Holocene to recent past |
title_fullStr |
Vegetation and carbon dynamics of high-latitude peatlands in a changing climate : from early Holocene to recent past |
title_full_unstemmed |
Vegetation and carbon dynamics of high-latitude peatlands in a changing climate : from early Holocene to recent past |
title_sort |
vegetation and carbon dynamics of high-latitude peatlands in a changing climate : from early holocene to recent past |
publisher |
Helsingin yliopisto |
publishDate |
2022 |
url |
http://hdl.handle.net/10138/348340 |
geographic |
Kola Peninsula Canada |
geographic_facet |
Kola Peninsula Canada |
genre |
kola peninsula Northern Sweden |
genre_facet |
kola peninsula Northern Sweden |
op_relation |
URN:ISBN:978-951-51-8541-9 Helsinki: 2022, Dissertationes Schola Doctoralis Scientiae Circumiectalis, Alimentariae, Biologicae. 2342-5423 Dissertationes Schola Doctoralis Scientiae Circumiectalis, Alimentariae, Biologicae URN:ISSN:2342-5431 http://hdl.handle.net/10138/348340 URN:ISBN:978-951-51-8542-6 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
_version_ |
1776201494135046144 |