Recruitment of Scots pine Pinus Sylvestris L. beyond the edge of its current distribution range in the forest-tundra ecotone of northern Norway
The forest-tundra ecotone in Northern Fennoscandia has experienced significant abiotic and biotic changes in recent decades which may ultimately affect the distribution of tree species. In this study, I investigate the factors influencing the density and distribution of Scots pine at the northern di...
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Norwegian University of Life Sciences
2023
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Online Access: | https://hdl.handle.net/11250/3076833 |
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ftunivmob:oai:nmbu.brage.unit.no:11250/3076833 2023-07-30T04:03:27+02:00 Recruitment of Scots pine Pinus Sylvestris L. beyond the edge of its current distribution range in the forest-tundra ecotone of northern Norway Kråkenes, Lars Mikkjel Hus Jane Uhd Jepsen, NINA – Norwegian Institute of Nature Research Ole Petter Laksforsmo Vindstad, UIT – The Arctic University of Norway Mikael Ohlson, NMBU – Norwegian University of Life Sciences 2023 application/pdf https://hdl.handle.net/11250/3076833 eng eng Norwegian University of Life Sciences no.nmbu:wiseflow:6839620:54592694 https://hdl.handle.net/11250/3076833 Master thesis 2023 ftunivmob 2023-07-12T22:47:33Z The forest-tundra ecotone in Northern Fennoscandia has experienced significant abiotic and biotic changes in recent decades which may ultimately affect the distribution of tree species. In this study, I investigate the factors influencing the density and distribution of Scots pine at the northern distribution range to assess the potential for spread northwards. The study area covered three selected regions in northern Norway (west, south and east), each represented by two survey sites: one placed well within the current distribution of pine (‘core’ sites) and one placed at the leading edge of the current distribution (‘edge’ sites). In all sites combined, data on a total of 146 seed trees and 1642 recruits were collected. Three GLM models were fitted, looking at the regional differences in recruit density, the underlying local conditions that contribute to this variation, and the factors that influence effective dispersal distance from the seed tree. The main results showed that; 1. There was generally lower recruitment at the leading edge of the distribution range, although this was not the case for the south region. 2. Recruit density decreased rapidly with the distance from the seed tree, even at the relatively short sampling distance. 3. Of the seed tree attributes, crown diameter was the only significant predictor, and positively influenced recruit density. 4. The proxy for graminoid abundance was the single significant predictor among the vegetation and soil variables and had a negative effect on recruit density. 5. Reindeer presence, as indicated by pellet density, negatively influenced recruit density, while moose presence showed a tendency for the opposite effect. 6. Birch density and stem diameter negatively influenced recruit density. In conclusion, warming can be expected to facilitate the recruitment and expansion of Scots pine, possibly aided by reduced competition with birch due to moth outbreaks. However, the rate of expansion may be limited by short dispersal distances from the seed tree, and ... Master Thesis Fennoscandia Northern Norway Tundra Open archive Norwegian University of Life Sciences: Brage NMBU Norway |
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collection |
Open archive Norwegian University of Life Sciences: Brage NMBU |
op_collection_id |
ftunivmob |
language |
English |
description |
The forest-tundra ecotone in Northern Fennoscandia has experienced significant abiotic and biotic changes in recent decades which may ultimately affect the distribution of tree species. In this study, I investigate the factors influencing the density and distribution of Scots pine at the northern distribution range to assess the potential for spread northwards. The study area covered three selected regions in northern Norway (west, south and east), each represented by two survey sites: one placed well within the current distribution of pine (‘core’ sites) and one placed at the leading edge of the current distribution (‘edge’ sites). In all sites combined, data on a total of 146 seed trees and 1642 recruits were collected. Three GLM models were fitted, looking at the regional differences in recruit density, the underlying local conditions that contribute to this variation, and the factors that influence effective dispersal distance from the seed tree. The main results showed that; 1. There was generally lower recruitment at the leading edge of the distribution range, although this was not the case for the south region. 2. Recruit density decreased rapidly with the distance from the seed tree, even at the relatively short sampling distance. 3. Of the seed tree attributes, crown diameter was the only significant predictor, and positively influenced recruit density. 4. The proxy for graminoid abundance was the single significant predictor among the vegetation and soil variables and had a negative effect on recruit density. 5. Reindeer presence, as indicated by pellet density, negatively influenced recruit density, while moose presence showed a tendency for the opposite effect. 6. Birch density and stem diameter negatively influenced recruit density. In conclusion, warming can be expected to facilitate the recruitment and expansion of Scots pine, possibly aided by reduced competition with birch due to moth outbreaks. However, the rate of expansion may be limited by short dispersal distances from the seed tree, and ... |
author2 |
Jane Uhd Jepsen, NINA – Norwegian Institute of Nature Research Ole Petter Laksforsmo Vindstad, UIT – The Arctic University of Norway Mikael Ohlson, NMBU – Norwegian University of Life Sciences |
format |
Master Thesis |
author |
Kråkenes, Lars Mikkjel Hus |
spellingShingle |
Kråkenes, Lars Mikkjel Hus Recruitment of Scots pine Pinus Sylvestris L. beyond the edge of its current distribution range in the forest-tundra ecotone of northern Norway |
author_facet |
Kråkenes, Lars Mikkjel Hus |
author_sort |
Kråkenes, Lars Mikkjel Hus |
title |
Recruitment of Scots pine Pinus Sylvestris L. beyond the edge of its current distribution range in the forest-tundra ecotone of northern Norway |
title_short |
Recruitment of Scots pine Pinus Sylvestris L. beyond the edge of its current distribution range in the forest-tundra ecotone of northern Norway |
title_full |
Recruitment of Scots pine Pinus Sylvestris L. beyond the edge of its current distribution range in the forest-tundra ecotone of northern Norway |
title_fullStr |
Recruitment of Scots pine Pinus Sylvestris L. beyond the edge of its current distribution range in the forest-tundra ecotone of northern Norway |
title_full_unstemmed |
Recruitment of Scots pine Pinus Sylvestris L. beyond the edge of its current distribution range in the forest-tundra ecotone of northern Norway |
title_sort |
recruitment of scots pine pinus sylvestris l. beyond the edge of its current distribution range in the forest-tundra ecotone of northern norway |
publisher |
Norwegian University of Life Sciences |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3076833 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Fennoscandia Northern Norway Tundra |
genre_facet |
Fennoscandia Northern Norway Tundra |
op_relation |
no.nmbu:wiseflow:6839620:54592694 https://hdl.handle.net/11250/3076833 |
_version_ |
1772814460376842240 |