Meadow plant growth and competition under elevated ozone and carbon dioxide
The main aim of my thesis project was to assess the impact of elevated ozone (O3) and carbon dioxide (CO2) on the growth, competition and community of meadow plants in northern Europe. The thesis project consisted of three separate O3 and CO2 exposure experiments that were conducted as open-top-cham...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/22440 2023-08-20T04:05:44+02:00 Meadow plant growth and competition under elevated ozone and carbon dioxide Niittykasvien kasvu ja kilpailu kohotetussa otsoni- ja hiilidioksidipitoisuudessa Rämö, Kaisa Henriikka Pleijel, Håkan University of Helsinki, Faculty of Biosciences, Department of Biological and Environmental Sciences, Environmental Sciences MTT Agrifood Research Finland, Environmental Research Helsingin yliopisto, biotieteellinen tiedekunta, bio- ja ympäristötieteiden laitos Helsingfors universitet, biovetenskapliga fakulteten, institutionen för bio- och miljövetenskaper Manninen, Sirkku Aikio, Sami 2010-11-25T13:26:45Z application/pdf http://hdl.handle.net/10138/22440 eng eng Helsingin yliopisto University of Helsinki Helsingfors universitet Yliopistopaino: Kaisa Rämö, 2006 URN:ISBN:952-92-0334-9 http://hdl.handle.net/10138/22440 URN:ISBN:952-10-3127-1 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. bio- ja ympäristötieteet Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2010 ftunivhelsihelda 2023-07-28T06:28:26Z The main aim of my thesis project was to assess the impact of elevated ozone (O3) and carbon dioxide (CO2) on the growth, competition and community of meadow plants in northern Europe. The thesis project consisted of three separate O3 and CO2 exposure experiments that were conducted as open-top-chamber (OTC) studies at Jokioinen, SW Finland, and a smaller-scale experiment with different availabilities of resources in greenhouses in Helsinki. The OTC experiments included a competition experiment with two- and three-wise interactions, a mesocosm-scale meadow community with a large number of species, and a pot experiment that assessed intraspecific differences of Centaurea jacea ecotypes. The studied lowland hay meadow proved to be an O3-sensitive biotope, as the O3 concentrations used (40-50 ppb) were moderate, and yet, six out of nine species (Campanula rotundifolia, Centaurea jacea, Fragaria vesca, Ranunculus acris, Trifolium medium, Vicia cracca) showed either significant reductions in biomass or reproductive development, visible O3 injury or any two as a response to elevated O3. The plant species and ecotypes exhibited large intra- and interspecific variation in their response to O3, but O3 and CO2 concentrations did not cause changes in their interspecific competition or in community composition. However, the largest O3-induced growth reductions were seen in the least abundant species (C. rotundifolia and F. vesca), which may indicate O3-induced suppression of weak competitors. The overall effects of CO2 were relatively small and mainly restricted to individual species and several measured variables. Based on the present studies, most of the deleterious effects of tropospheric O3 are not diminished by a moderate increase in CO2 under low N availability, and variation exists between different species and variables. The present study indicates that the growth of several herb species decreases with increasing atmospheric O3 concentrations, and that these changes may pose a threat to the biodiversity of meadows. ... Doctoral or Postdoctoral Thesis Campanula rotundifolia Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
bio- ja ympäristötieteet |
spellingShingle |
bio- ja ympäristötieteet Rämö, Kaisa Henriikka Meadow plant growth and competition under elevated ozone and carbon dioxide |
topic_facet |
bio- ja ympäristötieteet |
description |
The main aim of my thesis project was to assess the impact of elevated ozone (O3) and carbon dioxide (CO2) on the growth, competition and community of meadow plants in northern Europe. The thesis project consisted of three separate O3 and CO2 exposure experiments that were conducted as open-top-chamber (OTC) studies at Jokioinen, SW Finland, and a smaller-scale experiment with different availabilities of resources in greenhouses in Helsinki. The OTC experiments included a competition experiment with two- and three-wise interactions, a mesocosm-scale meadow community with a large number of species, and a pot experiment that assessed intraspecific differences of Centaurea jacea ecotypes. The studied lowland hay meadow proved to be an O3-sensitive biotope, as the O3 concentrations used (40-50 ppb) were moderate, and yet, six out of nine species (Campanula rotundifolia, Centaurea jacea, Fragaria vesca, Ranunculus acris, Trifolium medium, Vicia cracca) showed either significant reductions in biomass or reproductive development, visible O3 injury or any two as a response to elevated O3. The plant species and ecotypes exhibited large intra- and interspecific variation in their response to O3, but O3 and CO2 concentrations did not cause changes in their interspecific competition or in community composition. However, the largest O3-induced growth reductions were seen in the least abundant species (C. rotundifolia and F. vesca), which may indicate O3-induced suppression of weak competitors. The overall effects of CO2 were relatively small and mainly restricted to individual species and several measured variables. Based on the present studies, most of the deleterious effects of tropospheric O3 are not diminished by a moderate increase in CO2 under low N availability, and variation exists between different species and variables. The present study indicates that the growth of several herb species decreases with increasing atmospheric O3 concentrations, and that these changes may pose a threat to the biodiversity of meadows. ... |
author2 |
Pleijel, Håkan University of Helsinki, Faculty of Biosciences, Department of Biological and Environmental Sciences, Environmental Sciences MTT Agrifood Research Finland, Environmental Research Helsingin yliopisto, biotieteellinen tiedekunta, bio- ja ympäristötieteiden laitos Helsingfors universitet, biovetenskapliga fakulteten, institutionen för bio- och miljövetenskaper Manninen, Sirkku Aikio, Sami |
format |
Doctoral or Postdoctoral Thesis |
author |
Rämö, Kaisa Henriikka |
author_facet |
Rämö, Kaisa Henriikka |
author_sort |
Rämö, Kaisa Henriikka |
title |
Meadow plant growth and competition under elevated ozone and carbon dioxide |
title_short |
Meadow plant growth and competition under elevated ozone and carbon dioxide |
title_full |
Meadow plant growth and competition under elevated ozone and carbon dioxide |
title_fullStr |
Meadow plant growth and competition under elevated ozone and carbon dioxide |
title_full_unstemmed |
Meadow plant growth and competition under elevated ozone and carbon dioxide |
title_sort |
meadow plant growth and competition under elevated ozone and carbon dioxide |
publisher |
Helsingin yliopisto |
publishDate |
2010 |
url |
http://hdl.handle.net/10138/22440 |
genre |
Campanula rotundifolia |
genre_facet |
Campanula rotundifolia |
op_relation |
Yliopistopaino: Kaisa Rämö, 2006 URN:ISBN:952-92-0334-9 http://hdl.handle.net/10138/22440 URN:ISBN:952-10-3127-1 |
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_ |
1774716439180083200 |