Report - ICP Forests

42 2. Large Scale Crown Condition Surveys
2.2.2.8 Pinus pinaster
Nearly all of the Pinus pinaster trees are
growing in Mediterranean coniferous
forests. For the sample of continuously
monitored trees a distinct decline in crown
condition has been observed since 1991
with the share of trees not damaged
decreasing from 72.1% in 1991 to 19.2% in
2009 (Figure 2.2.2.8-1).
The worsening trend is as well reflected in
the share of plots showing a significant
increase in mean plot defoliation. Mean plot
defoliation increased on 38.5% of the plots
in the past decade. These plots are mainly
located along the Mediterranean coast in
Spain and France (Figure 2.2.2.8-2).
N trees 0-10% >10-25% >25%
1991 3498 72.1 21.5 6.4
1992 3585 63.7 24.6 11.6
1993 3610 61.8 26.6 11.6
1994 3543 50.5 32.6 16.9
1995 3568 39.9 43.4 16.7
1996 3553 36.9 44.6 18.6
1997 3507 40.4 47.7 11.9
1998 3560 37.1 47.8 15.1
1999 4776 40.8 47.3 11.9
2000 4845 40.0 48.4 11.6
2001 4847 34.7 54.1 11.2
2002 4828 31.1 55.2 13.7
2003 4796 28.1 55.6 16.3
2004 4764 29.5 54.6 15.9
2005 4770 21.9 54.3 23.8
2006 4772 22.0 55.7 22.4
2007 4810 23.7 55.8 20.5
2008 4760 22.4 59.7 17.8
2009 4616 19.2 60.5 20.3
N trees 0-10% >10-25% >25%
1998 3673 37.5 46.9 15.6
1999 4888 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 4861 21.6 53.6 24.9
2006 4861 21.7 54.8 23.5
2007 4875 23.5 55.4 21.1
2008 4825 22.2 59.4 18.4
2009 4681 18.9 59.9 21.2
Percent of trees
100
80
60
40
20
0
1991
1993
1995
1997
1999
2001
2003
2005
2007
2009
0-10% (91-09)
>25% (91-09)
0-10% (98-09)
>25% (98-09)
Year
Figure 2.2.2.8-8: Shares of trees of defoliation 0-
10% and >25% in two periods (1991-2009 and 1998-
2009).