Ozone (O(3)) exposure at Italian background sites exceeds UN/ECE concentration-based critical levels (CLe(c)), if expressed in terms of AOT40. Yet the occurrence of adverse effects of O(3) on forests and crops is controversial. Possible reasons include (i) ability of response indicators to provide an unbiased estimate of O(3) effects, (ii) setting of current CLe(c) in terms of cut-off value and accumulation level, (iii) response functions adopted to infer a critical level, (iv) environmental limitation to O(3) uptake and (v) inherent characteristics of Mediterranean vegetation. In particular, the two latter points suggest that critical levels based on accumulated stomatal flux (CLe(f)) can be a better predictor of O(3) risk than CLec. While this concept is largely acknowledged, a number of factors may limit its applicability for routine monitoring. This paper reviews levels, uptake and vegetation response to O(3) in Italy over recent years to discuss value, uncertainty and feasibility of different approaches to risk assessment.
Measuring, modelling and testing ozone exposure, flux and effects on vegetation in southern European conditions - What does not work? A review from Italy / M., Ferretti; M., Fagnano; T., Amoriello; M., Badiani; A., Ballarin Denti; A., Buffoni; F., Bussotti; A., Castagna; S., Cieslik; A., Costantini; A., De Marco; G., Gerosa; G., Lorenzini; Manes, Fausto; G., Merola; C., Nali; E., Paoletti; B., Petriccione; S., Racalbuto; G., Rana; A., Ranieri; A., Tagliaferri; G., Vialetto; Vitale, Marcello. - In: ENVIRONMENTAL POLLUTION. - ISSN 0269-7491. - STAMPA. - 146:3(2007), pp. 648-658. (Intervento presentato al convegno Workshop on Critical Levels of Ozone tenutosi a Obergurgl, AUSTRIA nel NOV 15-19, 2005) [10.1016/j.envpol.2006.05.012].
Measuring, modelling and testing ozone exposure, flux and effects on vegetation in southern European conditions - What does not work? A review from Italy
MANES, Fausto;VITALE, MARCELLO
2007
Abstract
Ozone (O(3)) exposure at Italian background sites exceeds UN/ECE concentration-based critical levels (CLe(c)), if expressed in terms of AOT40. Yet the occurrence of adverse effects of O(3) on forests and crops is controversial. Possible reasons include (i) ability of response indicators to provide an unbiased estimate of O(3) effects, (ii) setting of current CLe(c) in terms of cut-off value and accumulation level, (iii) response functions adopted to infer a critical level, (iv) environmental limitation to O(3) uptake and (v) inherent characteristics of Mediterranean vegetation. In particular, the two latter points suggest that critical levels based on accumulated stomatal flux (CLe(f)) can be a better predictor of O(3) risk than CLec. While this concept is largely acknowledged, a number of factors may limit its applicability for routine monitoring. This paper reviews levels, uptake and vegetation response to O(3) in Italy over recent years to discuss value, uncertainty and feasibility of different approaches to risk assessment.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
