Visible leaf injury in young trees of Fagus sylvatica L. and Quercus robur L. in relation to ozone uptake and ozone exposure. An Open-Top Chambers experiment in South Alpine environmental conditions.
An Open-Top Chambers experiment on Fagus sylvatica and Quercus robur seedlings was conducted in order to compare the performance of an exposure-based (AOT40) and a flux-based approaches in predicting the appearance of ozone visible injuries on leaves. Three different ozone treatments (charcoal-filtered; non-filtered; and open plots) and two soil moisture treatments (watered and non-watered plots) were performed. A Jarvisian stomatal conductance model was drawn up and parameterised for both species and typical South Alpine environmental conditions, thus allowing the calculation of ozone stomatal fluxes for every treatment. A critical ozone flux level for the onset of leaf visible injury in beech was clearly identified between 32.6 and 33.6 mmolO3 m(-2). In contrast, it was not possible to identify an exposure critical level using the AOT40 index. Water stress delayed the onset of the leaf visible injuries, but the flux-based approach was able to take it into account accurately.
Gerosa
G
G
Catholic University of Brescia, Department of Mathematics and Physics, Via dei Musei 41, 25125 Brescia, Italy.
Marzuoli
R
R
Desotgiu
R
R
Bussotti
F
F
Ballarin-Denti
A
A
D000393:Air Pollutants / Q000633:toxicity*; D003681:Dehydration; D004781:Environmental Exposure; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods; D029964:Fagus / Q000254:growth & development*; D016468:Forestry; D007558:Italy; D010083:Oxidants, Photochemical / Q000633:toxicity*; D010126:Ozone / Q000633:toxicity*; D018515:Plant Leaves / Q000187:drug effects*; D029963:Quercus / Q000254:growth & development*; D036226:Seedlings
D000393:Air Pollutants; D010083:Oxidants, Photochemical; D010126:Ozone