Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.650053
Title: The effects of increased atmospheric carbon dioxide on growth and morphology of seedlings of silver birch (Betula pendula Roth.) and Sitka spruce (Picea sitchensis (Bong.) Carr.)
Author: Evans, Lynn Patricia
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1994
Availability of Full Text:
Access from EThOS:
Full text unavailable from EThOS. Please try the link below.
Access from Institution:
Abstract:
The objective of this study was to determine the effects of long-term exposure to elevated CO2 on the growth and morphology of seedlings of Sitka spruce and silver birch, with a focus on the effects of elevated CO2 on the expansion, surface characteristics, specific leaf area, anatomy and chlorophyll content of leaves of silver birch. Seedlings of Sitka spruce and silver birch were placed in pots in open top chambers receiving ambient or elevated CO2. After one growing season there was a significant increase in biomass production in seedlings of Sitka spruce grown in elevated CO2 compared to those grown in ambient CO2, but after eighteen months this effect had disappeared. The initial increase in biomass was a result of a significant increase in root mass. At the end of the second growing season there was no effect of elevated CO2 on allocation of dry mass. There was no effect of elevated CO2 on total number of branches produced at the end of the second growing season but there was an increase in the rate of branch production. Nitrogen, phosphorus and potassium concentration of leaves was reduced in plants grown in elevated CO2. After one growing season biomass was increased in elevated CO2 plants by ca 20%, rates of photosynthesis were also higher in elevated CO2 plants. There was no effect of CO2 treatment on root: shoot ratio. There was a significant increase in branch production in plants grown in elevated CO2, but despite an increase in leaf area production early on in the growing season, there was no difference in total tree leaf area at the end of the growing season. Nitrogen, phosphorus and potassium concentration of leaves was reduced in plants grown in elevated CO2 and leaves on elevated CO2 plants senesced ca one week earlier than leaves of plants grown in ambient CO2.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.650053  DOI: Not available
Share: