Forest Condition in Europe - ICP Forests

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50 Forest Condition in Europe 2013 Figure 3.2.1-1: Plots with damage cause assessment in 2012
Forest Condition in Europe 2013 51 3.2.2. Assessment parameters The assessment of damage to trees based on the ICP Forests methodology includes three steps: symptom description, determination of causes, and quantification of the symptoms. Several symptoms of damage can be described for each tree. The symptom description should focus on important factors which may influence crown condition. Symptoms Symptom description aims at describing visible damage causes for single trees. The description indicates affected parts of the assessed trees and type of symptoms observed. Symptom description should focus on important factors that may influence the crown condition. Table 3.2.2-1: Affected parts of a tree Three main categories are distinguished for indicating the affected part of each tree: (a) leaves/needles, (b) branches, shoots, & buds, and (c) stem & collar. For each affected tree area, further specification is required (Tab. 3.2.2-1). Symptoms are grouped into broad categories like wounds, deformations, necrosis etc. This allows a detailed description of the occurring symptoms. Extent The damage extent is classified in eight classes (Tab. 3.2.2-2) In Trees where multiple damages occurred (and thus multiple extent classes), only the highest value was evaluated. Causal agents For each symptom description a causal agent must be determined. The determination of the causal agent is crucial for the study of the cause-effect mechanism. Causal agents are grouped into nine categories (Tab. 3.2.2-3). In each category a more detailed description is possible through a hierarchical coding system. Table 3.2.2.-2: Damage extent classes Class 0 5 1 – 10 % 11 – 20 % 21 – 40 % 41 – 60 % 61 – 80 % 81 – 99 % 100 % Table 3.2.2-3: Main causal agents Agent group Game and grazing Insects Fungi Abiotic agents Direct action of men Fire Atmospheric pollutants Other factors (investigated but) unidentified
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Forest Condition in Europe - ICP Forests

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