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Title: The effects of nitrogen uptake and nitrogen fixation on trees grown in elevated [CO2] : Alnus glutinosa and Pinus sylvestris
Author: Temperton, Victoria Martine
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1998
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There has been much research into the impact of rising [CO2] on growth and physiology of plants. Trees, being long-lived organisms which often exist in nutrient-limited soils, are especially relevant to the study of the long-term impact of rising [CO2], not least because they play an important role in the global carbon cycle. Their response to rising [CO2] is complex and often species-specific, because of interactions with other variables such as nutrients, temperature or the ability to fix atmospheric nitrogen. In particular, nitrogen-fixing trees grown in elevated [CO2] should grow better than non-fixers, since they can uncouple growth from soil nutrient availability and use the extra carbon to run the expensive nitrogen-fixing apparatus with greater efficiency and output. The aim of this thesis was to investigate the effects of nutrient uptake and nitrogen fixation on growth and biochemistry in two temperate tree species: Alnus glutinosa and Pinus sylvestris. The former is a nitrogen-fixing deciduous species, the latter a mycorrhizal conifer. One short-term experiment (15 weeks) and one long-term experiment (three years) were set up, both using seedlings grown in open top chambers (OTCs). In the short-term experiment, c. 90 one-year old Alnus seedlings (alder) and 85 one-year old Pinus seedlings (Scots pine) in pots were exposed to either ambient or ambient + 350 μmol mol-1 [CO2] for fifteen weeks. They were supplied with either a high nitrogen (N) fertiliser designed to allow maximum growth, or a low nitrogen fertiliser. Growth was measured weekly and two harvests were made, one at the beginning and one at the end of the experiment. Other variables measured were leaf area, stem basal diameter, chlorophyll concentrations, nutrient concentrations, and soluble carbohydrate and starch concentrations.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available