Gerosa G, Marzuoli R, Desotgiu R, Bussotti F, Ballarin-Denti A
Catholic University of Brescia, Department of Mathematics and Physics, Via dei Musei 41, 25125 Brescia, Italy.
Environ Pollut. 2008 Mar;152(2):274-84. doi: 10.1016/j.envpol.2007.06.045. Epub 2007 Aug 6.
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.
为了比较基于暴露量（AOT40）和基于通量的方法在预测叶片上臭氧可见伤害出现方面的性能，对欧洲山毛榉和英国栎幼苗进行了开顶式气室实验。设置了三种不同的臭氧处理（活性炭过滤；未过滤；以及露天地块）和两种土壤水分处理（浇水地块和未浇水地块）。针对这两个物种以及南阿尔卑斯典型环境条件，建立并参数化了一个贾维斯气孔导度模型，从而能够计算每种处理的臭氧气孔通量。在32.6至33.6 mmolO3 m(-2)之间明确确定了山毛榉叶片出现可见伤害的临界臭氧通量水平。相比之下，使用AOT40指数无法确定暴露临界水平。水分胁迫延迟了叶片可见伤害的出现，但基于通量的方法能够准确地将其考虑在内。
