Forest Condition in Europe - ICP Forests

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48 Forest Condition in Europe 2013 Figure 3.1.3.8-3: Development of mean plot defoliation (slope of linear regression) of evergreen oak species over the years 2002-2012
Forest Condition in Europe 2013 49 3.2. Damage cause assessment Crown condition is the most widely applied indicator for forest health and vitality in Europe. In order to interpret the crown condition accurately, it is necessary to assess tree parameters that have an influence on tree vitality. Parameters assessed in addition to crown condition include discolouration and damages caused by biotic and abiotic factors. Through the assessment of damage and its influence on crown condition, it is possible to draw conclusions on cause-effect mechanisms. Since 2005, tree crowns on Level I plots have been examined based on an amended method for damage assessment, which allows to obtain more information on injury symptoms, possible causes of damage, and extent of the injury. The aim of the damage cause assessment is to collect as much information as possible on the causal background of tree damages in order to enable a differential diagnosis and to better interpret the unspecific parameter ‘defoliation’. 3.2.1. Background of the survey in 2012 Assessment of damage causes is part of the visual assessment of crown condition. All trees included in the crown condition sample (Level I plots) are required to be regularly assessed for damage causes. In 2012, damage causes were assessed on about 6 000 plots in 28 countries across Europe (Fig. 3.2.1-1). The number of trees showing damage was 44 427. As a particular tree may be affected by more than one damage agent the total number of damage cases recorded was 59 014.
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Forest Condition in Europe - ICP Forests

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