engleski

AOT40 as preliminary indicator for ozone induced forest injury on mountain Medvednica near Zagreb

The phytotoxic effect of ozone has been known for decades and accumulated exposure to ozone above a threshold (AOT) is an attempt to assess the risk of forest injuries due to ozone attack. Ozone levels have been monitored for 16 years at Puntijarka site and AOT values are calculated for each growing season. Recent research performed by Forest Institute Jastrebarsko shows that forest damage at Medvednica is more severe then that in other parts of Croatia and even larger than the European mean. Air quality and boundary layer ozone are a possible cause for the observed damage. According to measurements the AOT40 values at Puntijarka in the period from 1988 to 2006 every year exceeded the critical limit of 5 ppm· ; ; ; ; ; ; h and even the critical value for more resistant trees has been exceeded as well.

AOT40; boundary layer ozone; forest injury; Medvednica

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