Abstract
The growth responses to elevated CO 2 found in experiments are highly variable and depend on other experimental parameters such as irrigation, fertilization, light regime, etc. As yet, the strength or even the sign of most interactions is all but impossible to predict from first principles. Experiments in ambient and CO 2 -enriched ambient air (+250 p.p.m.) have been conducted in specially adapted greenhouses (Solardomes) at Lancaster University for the past four seasons on Sitka spruce ( Picea sitchensis (Bong.) Carr.), wild cherry ( Prunus avium L.), beech ( Fagus sylvatica L.) and pedunculate oak ( Quercus robur L.). These experiments are reviewed together with other published studies on interactive effects of elevated CO 2 and water and nutrient supply on physiological processes, in particular gas exchange, in tree species. It is often assumed that drought tolerance will increase in elevated CO 2 because of a suppression of stomatal conductance and an increase in instantaneous water use efficiency. There is, however, some evidence that such effects could be more than offset in beech by CO 2 -induced increases in leaf area. It is tentatively suggested that in beech, drought tolerance could already have been reduced by the increase in atmospheric CO 2 over the last century.
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Claims 3
Claim · model-written summary
Growth responses to elevated CO2 vary with irrigation, fertilization, and light regime.
Verbatim
e0“The growth responses to elevated CO 2 found in experiments are highly variable and depend on other experimental parameters such as irrigation, fertilization, light regime, etc.”
t0“woody species”
Claim · model-written summary
In beech, CO2-induced increases in leaf area may more than offset potential drought-tolerance benefits from reduced stomatal conductance and greater instantaneous water-use efficiency.
Verbatim
e0“There is, however, some evidence that such effects could be more than offset in beech by CO 2 -induced increases in leaf area.”
Claim · model-written summary
The authors tentatively suggest that rising atmospheric CO2 over the last century may already have reduced drought tolerance in beech.
Verbatim
e0“It is tentatively suggested that in beech, drought tolerance could already have been reduced by the increase in atmospheric CO 2 over the last century.”