The Impact of Atmospheric CO2 and Temperature Changes on Stomatal Density: Observation from Quercus robur Lammas Leaves |
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| Authors: | Beerling David J; Chaloner William G |
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| Institution: | Environmental Research Centre, Department of Geography, University of Durham, Science Laboratories, South Road, Durham DH1 3LE and Department of Biology, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK |
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| Abstract: | A comparative study of leaves formed on shoots during the springand summer (lammas) of Quercus robur from three contrastinggeographical locations (Cardiff, Durham and London) gives ameasure of the effect of temperature on stomatal density. Thisis of value in attempting to distinguish the effects of CO2and temperature on observed stomatal density changes under differentCO2 and temperature conditions through the Quaternary. Theseleaves of normal and lammas shoots will have developed undersimilar CO2 levels but different environmental temperatures.Our results demonstrate that leaves formed under the warmersummer temperatures had reduced stomatal densities and indicesfrom all sites, compared with their spring counterparts. Thistrend was also detected from measurements of spring and summerleaves made upon herbarium material collected from the sametree in 1840. The results suggest that for Q. robur temperatureoverrides the influence of irradiance intensity and small seasonal( |
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