Division

Further background information on ecological processes on the plot, as well as an early warning system on events affecting the condition of the trees, could be obtained by recording the most obvious effects of biotic and abiotic (damaging) events and phenological phenomena. This is of special interest for the evaluation of Level II data at the national level.

The observations and recordings should be easy and simple, and limited to:

• Occurrence of flushing, color change and leaf/needle fall

• Biotic damage (pests and/or diseases)

• Abiotic damage (e.g. frost, wind, hail).