Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Environmental Limitations to O3 Uptake - Some Key Results from Young Trees Growing at Elevated Co2 Concentrations.
AU - Broadmeadow, M. S. J.
AU - Heath, J.
AU - Randle, T. J.
PY - 1999/11
Y1 - 1999/11
N2 - Elevated carbon dioxide concentrations and limited water supply have been shown to reduce the impact of ozone pollution on the growth and physiology of Quercus petraea in a long-term factorial experiment. These responses can be explained by observed reductions in stomatal conductance, and thus potential ozone exposure of 28% and 40% for CO2 and drought treatments respectively. However, parameterisation of a stomatal conductance model for Quercus robur and Fagus sylvatica grown under ambient and elevated CO2 concentrations in a separate experiment has demonstrated that elevated CO2 also reduces the responsiveness of stomata to both saturation deficit (LAVPD) and soil moisture deficit () in beech, and to a lesser extent, in oak. Season-long model simulations of ozone fluxes suggest that LAVPD and conductance parameters derived at ambient CO2 concentrations will lead to these fluxes being underestimated by 24% and 2% for beech and oak respectively at 615 ppm CO2.
AB - Elevated carbon dioxide concentrations and limited water supply have been shown to reduce the impact of ozone pollution on the growth and physiology of Quercus petraea in a long-term factorial experiment. These responses can be explained by observed reductions in stomatal conductance, and thus potential ozone exposure of 28% and 40% for CO2 and drought treatments respectively. However, parameterisation of a stomatal conductance model for Quercus robur and Fagus sylvatica grown under ambient and elevated CO2 concentrations in a separate experiment has demonstrated that elevated CO2 also reduces the responsiveness of stomata to both saturation deficit (LAVPD) and soil moisture deficit () in beech, and to a lesser extent, in oak. Season-long model simulations of ozone fluxes suggest that LAVPD and conductance parameters derived at ambient CO2 concentrations will lead to these fluxes being underestimated by 24% and 2% for beech and oak respectively at 615 ppm CO2.
KW - ozone - carbon dioxide - oak - beech - modelling - soil moisture
U2 - 10.1023/A:1005224823550
DO - 10.1023/A:1005224823550
M3 - Journal article
VL - 116
SP - 299
EP - 310
JO - Water, Air, and Soil Pollution
JF - Water, Air, and Soil Pollution
SN - 0049-6979
IS - 1-2
ER -