Changes in defoliation of main tree species, 1994-2000
12 Nov 2009
01 Jan 2002
29 Nov 2012, 11:39 AM
European forests showed a continuous deterioration in conditioning between 1986 and 1995, using crown condition as an indicator
Results since 1995 show a stabilisation at a high level of damage, with almost a quarter of the sample trees rated as damaged.