Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- Sites of naturally elevated carbon dioxide
- Migration in the ground of CO2 and other volatile contaminants. Theory and survey
- Levels of CO2 leakage in relation to geology
- CO2 emission in volcanic areas: case histories and hazards
- Controlled degassing of lakes with high CO2 content in Cameroon: an opportunity for ecosystem CO2-enrichment experiments
- Burning coal seams in southern Utah: a natural system for studies of plant responses to elevated CO2
- Long-term effects of enhanced CO2 concentrations on leaf gas exchange: research opportunities using CO2 springs
- Using Icelandic CO2 springs to understand the long-term effects of elevated atmospheric CO2
- Plant CO2 responses in the long term: plants from CO2 springs in Florida and tombs in Egypt
- Acidophilic grass communities of CO2 springs in central Italy: composition, structure and ecology
- Studying morpho-physiological responses of Scirpus lacustris from naturally CO2-enriched environments
- Carbon physiology of Quercus pubescens Wild, growing at the Bossoleto CO2 spring in central Italy
- Preliminary results on dissolved inorganic 13C and 14C content of a CO2-rich mineral spring of Catalonia (NE Spain) and of plants growing in its surroundings
- The impact of elevated CO2 on the growth of Agrostis canina and Plantago major adapted to contrasting CO2 concentrations
- Stomatal numbers in holm oak (Quercus ilex L.) leaves grown in naturally and artificially CO2-enriched environments
- Effects of CO2 on NH4+ assimilation by Cyanidium caldarium, an acidophilic hot springs and hot soils unicellular alga
- Can rising CO2 alleviate oxidative risk for the plant cell? Testing the hypothesis under natural CO2 enrichment
- Increasing concentrations of atmospheric CO2 and decomposition processes in forest ecosystems
- Index
Stomatal numbers in holm oak (Quercus ilex L.) leaves grown in naturally and artificially CO2-enriched environments
Published online by Cambridge University Press: 10 February 2010
- Frontmatter
- Contents
- List of contributors
- Preface
- Sites of naturally elevated carbon dioxide
- Migration in the ground of CO2 and other volatile contaminants. Theory and survey
- Levels of CO2 leakage in relation to geology
- CO2 emission in volcanic areas: case histories and hazards
- Controlled degassing of lakes with high CO2 content in Cameroon: an opportunity for ecosystem CO2-enrichment experiments
- Burning coal seams in southern Utah: a natural system for studies of plant responses to elevated CO2
- Long-term effects of enhanced CO2 concentrations on leaf gas exchange: research opportunities using CO2 springs
- Using Icelandic CO2 springs to understand the long-term effects of elevated atmospheric CO2
- Plant CO2 responses in the long term: plants from CO2 springs in Florida and tombs in Egypt
- Acidophilic grass communities of CO2 springs in central Italy: composition, structure and ecology
- Studying morpho-physiological responses of Scirpus lacustris from naturally CO2-enriched environments
- Carbon physiology of Quercus pubescens Wild, growing at the Bossoleto CO2 spring in central Italy
- Preliminary results on dissolved inorganic 13C and 14C content of a CO2-rich mineral spring of Catalonia (NE Spain) and of plants growing in its surroundings
- The impact of elevated CO2 on the growth of Agrostis canina and Plantago major adapted to contrasting CO2 concentrations
- Stomatal numbers in holm oak (Quercus ilex L.) leaves grown in naturally and artificially CO2-enriched environments
- Effects of CO2 on NH4+ assimilation by Cyanidium caldarium, an acidophilic hot springs and hot soils unicellular alga
- Can rising CO2 alleviate oxidative risk for the plant cell? Testing the hypothesis under natural CO2 enrichment
- Increasing concentrations of atmospheric CO2 and decomposition processes in forest ecosystems
- Index
Summary
SUMMARY
The objects of the present study were:
1) to investigate the stomatal morphology of leaves of holm oak trees grown in a naturally CO2-enriched environment;
2) to compare it with the stomatal density of leaves of holm oak seedlings grown in an artificially CO2-enriched environment.
Among the stomatal morphology parameters we analysed, the only significant alteration we observed in trees which had grown by the CO2 spring was a reduction in stomatal density.
The rather special response of one tree might be related to the rock on which it stands, which may be causing the tree severe water stress. However, the reduction did not increase significantly as the concentrations of CO2 increased.
The experiment in artificially CO2-enriched atmospheres indicated that the stomatal density of holm oak leaves was reduced by an increase in CO2. The results are discussed with an analysis of herbarium holm oak leaves.
INTRODUCTION
The effect on stomatal density of the increase of atmospheric CO2 is not yet fully clarified, although some experiments exposing plants to elevated CO2 regimes in small scale chambers and field enclosures indicate that stomatal density decreases with increasing CO2 concentrations (Madsen, 1973; O'Leary & Knetch, 1981; Thomas & Harvey, 1983; Imai, Coleman & Yanagisawa, 1984; Woodward, 1987), despite contradictory responses which were sometimes observed.
Criticisms have been levelled at this kind of experiment because of poor balance between energy supply and water loss from leaves (Morison, 1987). Conversely, natural vegetation is well coupled with the atmosphere, in terms of both its energy budget and its environmental feedback mechanisms.
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- Plant Responses to Elevated CO2Evidence from Natural Springs, pp. 197 - 208Publisher: Cambridge University PressPrint publication year: 1997
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