Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens
Birch is the third most common tree species in Sweden and has previously been seen as a weed in the forests. In the last 20 years, birch has had a clearly increasing trend in Swedens growing timber stock, but there are still many knowledge gaps regarding management, regeneration, processing, and its...
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ftsluppsalast:oai:stud.epsilon.slu.se:17492 2023-05-15T17:45:04+02:00 Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens Nykvist, Pontus 2022-01-28 application/pdf https://stud.epsilon.slu.se/17492/3/Nykvist_P_220128.pdf en swe eng swe https://stud.epsilon.slu.se/17492/ urn:nbn:se:slu:epsilon-s-17492 https://stud.epsilon.slu.se/17492/3/Nykvist_P_220128.pdf Nykvist, Pontus, 2022. Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens. Second cycle, A2E. Umeå: (S) > Dept. of Forest Ecology and Management <https://stud.epsilon.slu.se/view/divisions/OID-241.html> Plant ecology Forestry production Second cycle, A2E NonPeerReviewed 2022 ftsluppsalast 2022-09-10T18:13:09Z Birch is the third most common tree species in Sweden and has previously been seen as a weed in the forests. In the last 20 years, birch has had a clearly increasing trend in Swedens growing timber stock, but there are still many knowledge gaps regarding management, regeneration, processing, and its impact on the environment. In the national forest assessment's inventories, the two birch species silver birch (Betula pendula) and downy birch (Betula pubescens) are not separated from each other, and are only registered as birch. The two birch species have some morphological differences that allow them to be separated from each other, but these differences are not always distinct, which creates uncertainty in species identification. The purpose of this work is to validate the morphological separation method for the two birch species by using a proven chemical method. This is to estimate the possible margin of error over how safe the morphological method is. Having a reliable species determination method is necessary as the birch species can be used for different end products and have different preferences regarding plant habitat. The data for the study were collected through a transect inventory at three different premises in northern Sweden. Bark samples were collected at each site from three fellings, all of which were felled in 2014, a total of 90 bark samples were collected from each birch species. The result from the chemical separation method was 100% consistent with the morphological one. This means that the morphological separation method seems to be highly reliable for younger birches. In addition, the benefits of a greater involvement of birch in terms of biodiversity and risk reduction are discussed, as well as why it is justified to distinguish the two birch species. Björk är det tredje vanligaste trädslaget i Sverige och har tidigare setts som ett ogräs i skogen. De senaste 20 åren har björken haft en tydligt ökande trend gällande virkesförråd, trots detta finns det fortfarande många kunskapsluckor ... Text Northern Sweden Swedish University of Agricultural Sciences: Epsilon Archive for Student Projects |
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Open Polar |
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Swedish University of Agricultural Sciences: Epsilon Archive for Student Projects |
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ftsluppsalast |
language |
English Swedish |
topic |
Plant ecology Forestry production |
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Plant ecology Forestry production Nykvist, Pontus Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens |
topic_facet |
Plant ecology Forestry production |
description |
Birch is the third most common tree species in Sweden and has previously been seen as a weed in the forests. In the last 20 years, birch has had a clearly increasing trend in Swedens growing timber stock, but there are still many knowledge gaps regarding management, regeneration, processing, and its impact on the environment. In the national forest assessment's inventories, the two birch species silver birch (Betula pendula) and downy birch (Betula pubescens) are not separated from each other, and are only registered as birch. The two birch species have some morphological differences that allow them to be separated from each other, but these differences are not always distinct, which creates uncertainty in species identification. The purpose of this work is to validate the morphological separation method for the two birch species by using a proven chemical method. This is to estimate the possible margin of error over how safe the morphological method is. Having a reliable species determination method is necessary as the birch species can be used for different end products and have different preferences regarding plant habitat. The data for the study were collected through a transect inventory at three different premises in northern Sweden. Bark samples were collected at each site from three fellings, all of which were felled in 2014, a total of 90 bark samples were collected from each birch species. The result from the chemical separation method was 100% consistent with the morphological one. This means that the morphological separation method seems to be highly reliable for younger birches. In addition, the benefits of a greater involvement of birch in terms of biodiversity and risk reduction are discussed, as well as why it is justified to distinguish the two birch species. Björk är det tredje vanligaste trädslaget i Sverige och har tidigare setts som ett ogräs i skogen. De senaste 20 åren har björken haft en tydligt ökande trend gällande virkesförråd, trots detta finns det fortfarande många kunskapsluckor ... |
format |
Text |
author |
Nykvist, Pontus |
author_facet |
Nykvist, Pontus |
author_sort |
Nykvist, Pontus |
title |
Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens |
title_short |
Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens |
title_full |
Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens |
title_fullStr |
Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens |
title_full_unstemmed |
Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens |
title_sort |
utvärdering av metod för att morfologiskt särskilja björkarterna betula pendula och betula pubescens |
publishDate |
2022 |
url |
https://stud.epsilon.slu.se/17492/3/Nykvist_P_220128.pdf |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
https://stud.epsilon.slu.se/17492/ urn:nbn:se:slu:epsilon-s-17492 https://stud.epsilon.slu.se/17492/3/Nykvist_P_220128.pdf Nykvist, Pontus, 2022. Utvärdering av metod för att morfologiskt särskilja björkarterna Betula pendula och Betula pubescens. Second cycle, A2E. Umeå: (S) > Dept. of Forest Ecology and Management <https://stud.epsilon.slu.se/view/divisions/OID-241.html> |
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