Structural Growth in Mountain Birch, Betula pubescens ssp. czerepanovii
In this thesis, I have studied long shoot performance in the monoecious, deciduous tree Betula pubescens ssp. czerepanovii. In field studies and a common garden experiment, I have a) studied how environmental variations affect the performance of long shoots in mountain birch, and b) described the re...
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Uppsala universitet, Institutionen för ekologi och evolution
2005
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ftuppsalauniv:oai:DiVA.org:uu-6025 2023-05-15T12:59:53+02:00 Structural Growth in Mountain Birch, Betula pubescens ssp. czerepanovii Borg, Christina 2005 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6025 eng eng Uppsala universitet, Institutionen för ekologi och evolution Uppsala : Acta Universitatis Upsaliensis Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 108 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6025 urn:isbn:91-554-6377-0 info:eu-repo/semantics/openAccess Ecology Ekologi Terrestrial freshwater and marine ecology Terrestisk limnisk och marin ekologi Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2005 ftuppsalauniv 2023-02-23T21:44:23Z In this thesis, I have studied long shoot performance in the monoecious, deciduous tree Betula pubescens ssp. czerepanovii. In field studies and a common garden experiment, I have a) studied how environmental variations affect the performance of long shoots in mountain birch, and b) described the relationship between long shoot performance and characteristics of the parent long shoot. I have shown that difference in long shoot performance to some extent can be explained by environmental variables such as temperature, precipitation and global radiation the current and previous summer, annual soil and air temperatures, and the length of growing season. For example, a low summer temperature the previous summer had a negative effect on a majority of long shoot characteristics. Variation in shoot characteristics was of the same magnitude along the regional east-western gradient as along the local altitudinal gradient. Variation among individual trees was of the same magnitude as variation among years. Further, long shoot performance was affected by the parent shoot characteristics and reflects that primordia of different organs are formed in the previous summer. On several occasions, freezing damage to mountain birch has been observed on Mt Njulla in northernmost Sweden. Following such damage, fewer but larger leaves emerge. Damages were compensated for with increased number of buds on long shoots produced the same year and one year after damage. Moreover, there were more new long shoots born on short shoots among damaged trees. Dormant buds and short shoots fulfil important functions in a fluctuating environment and as an adaptation to recurring damages of different origin and severity. Differences in the performance among mountain birch saplings grown in a common-garden at Abisko could to a large degree be explained by their origin. Further, saplings from Sweden and from Iceland responded differently to defoliation, and fertilization did not alter the responses to defoliation. Doctoral or Postdoctoral Thesis Abisko Iceland Uppsala University: Publications (DiVA) Abisko ENVELOPE(18.829,18.829,68.349,68.349) |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Ecology Ekologi Terrestrial freshwater and marine ecology Terrestisk limnisk och marin ekologi |
spellingShingle |
Ecology Ekologi Terrestrial freshwater and marine ecology Terrestisk limnisk och marin ekologi Borg, Christina Structural Growth in Mountain Birch, Betula pubescens ssp. czerepanovii |
topic_facet |
Ecology Ekologi Terrestrial freshwater and marine ecology Terrestisk limnisk och marin ekologi |
description |
In this thesis, I have studied long shoot performance in the monoecious, deciduous tree Betula pubescens ssp. czerepanovii. In field studies and a common garden experiment, I have a) studied how environmental variations affect the performance of long shoots in mountain birch, and b) described the relationship between long shoot performance and characteristics of the parent long shoot. I have shown that difference in long shoot performance to some extent can be explained by environmental variables such as temperature, precipitation and global radiation the current and previous summer, annual soil and air temperatures, and the length of growing season. For example, a low summer temperature the previous summer had a negative effect on a majority of long shoot characteristics. Variation in shoot characteristics was of the same magnitude along the regional east-western gradient as along the local altitudinal gradient. Variation among individual trees was of the same magnitude as variation among years. Further, long shoot performance was affected by the parent shoot characteristics and reflects that primordia of different organs are formed in the previous summer. On several occasions, freezing damage to mountain birch has been observed on Mt Njulla in northernmost Sweden. Following such damage, fewer but larger leaves emerge. Damages were compensated for with increased number of buds on long shoots produced the same year and one year after damage. Moreover, there were more new long shoots born on short shoots among damaged trees. Dormant buds and short shoots fulfil important functions in a fluctuating environment and as an adaptation to recurring damages of different origin and severity. Differences in the performance among mountain birch saplings grown in a common-garden at Abisko could to a large degree be explained by their origin. Further, saplings from Sweden and from Iceland responded differently to defoliation, and fertilization did not alter the responses to defoliation. |
format |
Doctoral or Postdoctoral Thesis |
author |
Borg, Christina |
author_facet |
Borg, Christina |
author_sort |
Borg, Christina |
title |
Structural Growth in Mountain Birch, Betula pubescens ssp. czerepanovii |
title_short |
Structural Growth in Mountain Birch, Betula pubescens ssp. czerepanovii |
title_full |
Structural Growth in Mountain Birch, Betula pubescens ssp. czerepanovii |
title_fullStr |
Structural Growth in Mountain Birch, Betula pubescens ssp. czerepanovii |
title_full_unstemmed |
Structural Growth in Mountain Birch, Betula pubescens ssp. czerepanovii |
title_sort |
structural growth in mountain birch, betula pubescens ssp. czerepanovii |
publisher |
Uppsala universitet, Institutionen för ekologi och evolution |
publishDate |
2005 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6025 |
long_lat |
ENVELOPE(18.829,18.829,68.349,68.349) |
geographic |
Abisko |
geographic_facet |
Abisko |
genre |
Abisko Iceland |
genre_facet |
Abisko Iceland |
op_relation |
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 108 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6025 urn:isbn:91-554-6377-0 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766124806602752000 |