Holocene vegetation dynamics and climate changes in the Torneträsk area, northern Sweden
The aim of this study was to reconstruct the Holocene vegetation history and the climate changes in a subarctic area. The results are based on pollen and macrofossil records from six lakes in the Torneträsk area. The lakes are situated at altitudes between 370 and 999 m a.s.l., along a transect from...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Department of Quaternary Geology, Lund University
1999
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Online Access: | https://lup.lub.lu.se/record/39560 |
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ftulundlup:oai:lup.lub.lu.se:dbb1652c-1aac-4afa-99c6-8c322ebce15a 2023-05-15T12:59:57+02:00 Holocene vegetation dynamics and climate changes in the Torneträsk area, northern Sweden Barnekow, Lena 1999 https://lup.lub.lu.se/record/39560 eng eng Department of Quaternary Geology, Lund University https://lup.lub.lu.se/record/39560 other:ISRN: SE-LUNBDS/NBGK-99/43+30p scopus:0033061758 Lundqua thesis; (43) (1999) ISSN: 0281-3033 Geology Paleobotanik palynology phylogeny Palaeobotany northern Sweden Torneträsk Abisko lake-level radiocarbon dating forest history Holocene tree-line climate Vegetation fylogeni palynologi Physical geography geomorphology pedology cartography climatology Fysisk geografi geomorfologi marklära kartografi klimatologi thesis/doccomp info:eu-repo/semantics/doctoralThesis text 1999 ftulundlup 2023-02-01T23:27:24Z The aim of this study was to reconstruct the Holocene vegetation history and the climate changes in a subarctic area. The results are based on pollen and macrofossil records from six lakes in the Torneträsk area. The lakes are situated at altitudes between 370 and 999 m a.s.l., along a transect from the boreal pine-birch forest to the alpine tundra with heath vegetation. The chronology in each lake is based on radiocarbon dated terrestrial plant macrofossils and combined with varve chronology in one of the lakes. Ages from radiocarbon dated plant macrofossils were compared with ages from radiocarbon dated bulk sediment samples in two of the lakes. The results show that radiocarbon dated bulk sediment samples give older ages compared to the macrofossil samples. The age differences varied between 550 and 2200 years in samples from a lake with calcareous rich sediment and between 250 and 800 years in samples from lake sediment with a low carbonate carbon content. Erroneous high ages from bulk sediment samples will not only effect the chronology, but will also lead to incorrect pollen-influx calculations. The results of this study also indicate that the tree-line, which consists of mountain birch ( Betula pubescens ssp. tortuosa ), was situated c. 300-400 m above the present tree-line during the early and the mid-Holocene. When land up-lift has been taken into account this higher tree-line corresponds to a summer temperature of 1.5-2°C higher than today. The climate was warm and moist during the early Holocene and warm and dry during the mid-Holocene. A pine-birch forest expanded first in the eastern part of the Torneträsk area at c. 8300 cal BP and about 700 years later to the western part at low altitudes. Optimal conditions for pine ( Pinus sylvestris ) occurred between 6300 and 4500 cal BP when the pine-birch forest reached its highest altitude at least 560 m a.s.l., i.e. 110 m above the present pine limit. During this time the pine limit reached 175 m above the present. Dry conditions during this interval are ... Doctoral or Postdoctoral Thesis Abisko Northern Sweden Subarctic Tundra Lund University Publications (LUP) Abisko ENVELOPE(18.829,18.829,68.349,68.349) Torneträsk ENVELOPE(18.861,18.861,68.392,68.392) |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology Paleobotanik palynology phylogeny Palaeobotany northern Sweden Torneträsk Abisko lake-level radiocarbon dating forest history Holocene tree-line climate Vegetation fylogeni palynologi Physical geography geomorphology pedology cartography climatology Fysisk geografi geomorfologi marklära kartografi klimatologi |
spellingShingle |
Geology Paleobotanik palynology phylogeny Palaeobotany northern Sweden Torneträsk Abisko lake-level radiocarbon dating forest history Holocene tree-line climate Vegetation fylogeni palynologi Physical geography geomorphology pedology cartography climatology Fysisk geografi geomorfologi marklära kartografi klimatologi Barnekow, Lena Holocene vegetation dynamics and climate changes in the Torneträsk area, northern Sweden |
topic_facet |
Geology Paleobotanik palynology phylogeny Palaeobotany northern Sweden Torneträsk Abisko lake-level radiocarbon dating forest history Holocene tree-line climate Vegetation fylogeni palynologi Physical geography geomorphology pedology cartography climatology Fysisk geografi geomorfologi marklära kartografi klimatologi |
description |
The aim of this study was to reconstruct the Holocene vegetation history and the climate changes in a subarctic area. The results are based on pollen and macrofossil records from six lakes in the Torneträsk area. The lakes are situated at altitudes between 370 and 999 m a.s.l., along a transect from the boreal pine-birch forest to the alpine tundra with heath vegetation. The chronology in each lake is based on radiocarbon dated terrestrial plant macrofossils and combined with varve chronology in one of the lakes. Ages from radiocarbon dated plant macrofossils were compared with ages from radiocarbon dated bulk sediment samples in two of the lakes. The results show that radiocarbon dated bulk sediment samples give older ages compared to the macrofossil samples. The age differences varied between 550 and 2200 years in samples from a lake with calcareous rich sediment and between 250 and 800 years in samples from lake sediment with a low carbonate carbon content. Erroneous high ages from bulk sediment samples will not only effect the chronology, but will also lead to incorrect pollen-influx calculations. The results of this study also indicate that the tree-line, which consists of mountain birch ( Betula pubescens ssp. tortuosa ), was situated c. 300-400 m above the present tree-line during the early and the mid-Holocene. When land up-lift has been taken into account this higher tree-line corresponds to a summer temperature of 1.5-2°C higher than today. The climate was warm and moist during the early Holocene and warm and dry during the mid-Holocene. A pine-birch forest expanded first in the eastern part of the Torneträsk area at c. 8300 cal BP and about 700 years later to the western part at low altitudes. Optimal conditions for pine ( Pinus sylvestris ) occurred between 6300 and 4500 cal BP when the pine-birch forest reached its highest altitude at least 560 m a.s.l., i.e. 110 m above the present pine limit. During this time the pine limit reached 175 m above the present. Dry conditions during this interval are ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Barnekow, Lena |
author_facet |
Barnekow, Lena |
author_sort |
Barnekow, Lena |
title |
Holocene vegetation dynamics and climate changes in the Torneträsk area, northern Sweden |
title_short |
Holocene vegetation dynamics and climate changes in the Torneträsk area, northern Sweden |
title_full |
Holocene vegetation dynamics and climate changes in the Torneträsk area, northern Sweden |
title_fullStr |
Holocene vegetation dynamics and climate changes in the Torneträsk area, northern Sweden |
title_full_unstemmed |
Holocene vegetation dynamics and climate changes in the Torneträsk area, northern Sweden |
title_sort |
holocene vegetation dynamics and climate changes in the torneträsk area, northern sweden |
publisher |
Department of Quaternary Geology, Lund University |
publishDate |
1999 |
url |
https://lup.lub.lu.se/record/39560 |
long_lat |
ENVELOPE(18.829,18.829,68.349,68.349) ENVELOPE(18.861,18.861,68.392,68.392) |
geographic |
Abisko Torneträsk |
geographic_facet |
Abisko Torneträsk |
genre |
Abisko Northern Sweden Subarctic Tundra |
genre_facet |
Abisko Northern Sweden Subarctic Tundra |
op_source |
Lundqua thesis; (43) (1999) ISSN: 0281-3033 |
op_relation |
https://lup.lub.lu.se/record/39560 other:ISRN: SE-LUNBDS/NBGK-99/43+30p scopus:0033061758 |
_version_ |
1766145679269298176 |