Forest Condition in Europe - ICP Forests

percent of trees
Forest Condition in Europe 2013 39
3.1.3.4. Mediterranean lowland
pines
To the group of Mediterranean
lowland pines belong P.. Crown
condition of these tree species is
characterized by a pronounced
increase in mean defoliation since
1992. This is evident from the
development of healthy trees.
Their share dropped from about
64% in 1992 to 27.9% in 2012.
The lowest share of undamaged
trees (18.1%) was recorded in
2009. In contrast to the healthy
trees the percentage of damaged
pines peaked in 2005, decreased
thereafter and fluctuated since
then reaching about 16% in 2012
(Tab. 3.1.3.4-1, Fig. 3.1.3.4-1 and
Fig. 3.1.3.4-2).
As regards the spatial trend, the
share of plots showing recovery
(14.7%) exceeds the share of
plots, on which the mean defoliation
increased between 2002 and
2012 (11.7%). These plots are
mainly located along the Mediterranean
coast in France and in
northern Spain (Fig. 3.1.3.4-3).
Table 3.1.3.4-1: Shares of trees in different defoliation
classes.
N Trees 0-10% >10-25% >25%
1993 3747 62.1 25.9 12.0
1994 3719 50.3 32.0 17.7
1995 3743 39.9 42.5 17.6
1996 3686 36.9 43.7 19.4
1997 3680 38.5 45.7 15.7
1998 3672 37.5 46.9 15.6
1999 4887 39.9 47.4 12.7
2000 4934 39.4 48.4 12.2
2001 4936 34.1 53.8 12.1
2002 4893 30.7 55.0 14.3
2003 4861 27.8 55.2 17.1
2004 4877 28.9 54.0 17.2
2005 4860 21.6 53.6 24.9
2006 4860 21.6 54.9 23.5
2007 4874 23.5 55.4 21.1
2008 4825 22.2 59.4 18.4
2009 4681 18.9 59.9 21.2
2010 4656 23.7 58.6 17.6
2011 4751 28.0 55.7 16.3
2012 4661 19.5 62.6 17.9
N Trees 0-10% >10-25% >25%
1998 3672 37.5 46.9 15.6
1999 4887 39.9 47.4 12.7
2000 4934 39.4 48.4 12.2
2001 4936 34.1 53.8 12.1
2002 4893 30.7 55.0 14.3
2003 4861 27.8 55.2 17.1
2004 4877 28.9 54.0 17.2
2005 4860 21.6 53.6 24.9
2006 4860 21.6 54.9 23.5
2007 4874 23.5 55.4 21.1
2008 4825 22.2 59.4 18.4
2009 4681 18.9 59.9 21.2
2010 4656 23.7 58.6 17.6
2011 4751 28.0 55.7 16.3
2012 4661 19.5 62.6 17.9
80
70
60
50
0-10% (92-11) >25% (92-11)
0-10% (97-11) >25% (97-11)
40
30
20
10
Figure 3.1.3.4-1: Mean defoliation in two periods
(1993-2012 and 1998-2012)
0
1993 1995 1997 1999 2001 2003 2005 2007 2009 2011
year
Figure 3.1.3.4-2: Shares of trees of defoliation 0-10%
and > 25% in two periods (1992-2012 and 1997-2012)