natural stress factors on the condition of forest ecosystems. In order to meet its data generation and reporting obligations, ICP Forests employs data collection at two levels. The state of health of forest trees can be determined by assessing the foliage loss. With a little practice, this can be accurately estimated by the foresters or other trained personnel. The development of forest damage can be traced through repeated assessments of the same trees. The poor health status of the forests in Central Europe concerns all the Europe. The pictures of the forests on large area
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