期刊名称：Condition of Forests in Europe / Waldzustand in Europa
印刷版ISSN：1020-587X
出版年度：2007
卷号：1
页码：12-12
出版社：United Nations Economic Commission for Europe
摘要：·Mean defoliation for all tree species
has been fluctuating since 1990.
However, there was a slight overall
decrease in forest condition over the
past 10 years. Only in 2006 was some
recuperation recorded. Around one
fifth of the trees assessed in 2006
were rated as damaged or dead.
··Whereas beech had shown some
improvements in 2005 and a stable
mean defoliation in 2006, deciduous
oak species showed a marked recuperation
in the most recent assessments.
For Scots pine and Norway
spruce slight improvements were
registered. Mean defoliation of holm
oak and maritime pine remained
unchanged in 2006.
