Forest Condition in Europe - ICP Forests

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38 Forest Condition in Europe 2013 Figure 3.1.3.3-3: Development of mean plot defoliation (slope of linear regression) of Picea abies over the years 2002-2012
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)
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