A line graph shows the mean crown defoliation in percent for the total forest and the tree species spruce, pine, beech and oak for the period 1991 to 2017. For beech there is a significant increasing trend, for oak it is quadratically decreasing. There is no trend for the other tree species and the total forest.
FW-I-7: Forest condition

A line graph shows the mean crown defoliation in percent for the total forest and the tree species spruce, pine, beech and oak for the period 1991 to 2017. For beech there is a significant increasing trend, for oak it is quadratically decreasing. There is no trend for the other tree species and the total forest.

Source: BMEL (forest condition survey)image download