Forest Condition in Europe - ICP Forests

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42 Forest Condition in Europe 2013 Figure 3.1.3.5-3: Development of mean plot defoliation (slope of linear regression) of Fagus sylvatica over the years 2002-2012
percent of trees Forest Condition in Europe 2013 43 3.1.3.6. Deciduous temperate oak The group of deciduous temperate oaks includes Quercus robur and Q. petraea occurring throughout central Europe. Temporal development of these tree species is characterized by peaks in 1997 and 2005. In the subsequent years some trees may have recovered as the percentage of trees defoliated by 25% and more decreased and varied since then between 33% and 37% in both time series (Tab. 3.1.3.6-1, Fig. 3.1.3.6-1, Fig. 3.1.3.6-2). The linear trend based on time period 2002-2012 shows that on only 7.7% of all plots the mean defoliation increased. For 75.8% of the plots the calculation does not support the existence of any trends. A cluster of plots showing decreasing trend of mean defoliation can be seen in central France (Fig. 3.1.3.6-3). Table 3.1.3.6-1: Shares of trees in different defoliation classes. N Trees 0-10% >10-25% >25% 1993 5886 36.9 32.8 30.3 1994 6195 32.9 32.6 34.5 1995 6063 33.0 36.2 30.8 1996 5903 24.9 39.2 35.9 1997 5970 16.8 42.6 40.6 1998 6183 20.5 42.3 37.1 1999 6349 20.9 47.5 31.6 2000 6345 21.3 48.0 30.7 2001 6365 19.8 49.3 30.9 2002 6380 19.1 50.8 30.1 2003 6379 15.7 47.6 36.7 2004 6498 16.1 44.9 39.0 2005 6547 14.9 43.4 41.7 2006 6053 19.5 45.3 35.3 2007 6157 18.1 46.2 35.7 2008 6339 17.5 47.4 35.1 2009 6260 19.5 45.9 34.6 2010 6286 17.9 46.5 35.5 2011 6463 18.9 46.1 35.0 2012 6441 15.1 41.7 43.2 N Trees 0-10% >10-25% >25% 1998 6611 20.1 41.7 38.1 1999 6657 21.0 47.4 31.6 2000 6749 20.3 46.5 33.1 2001 6694 19.2 48.1 32.7 2002 6541 18.8 50.3 30.9 2003 6542 15.5 47.6 37.0 2004 6670 16.3 44.5 39.3 2005 6738 14.6 43.2 42.2 2006 6253 19.2 45.4 35.5 2007 6380 17.6 47.1 35.3 2008 6523 17.2 48.2 34.7 2009 6796 19.3 47.4 33.4 2010 6770 17.5 47.0 35.5 2011 6947 17.8 47.6 34.5 2012 6925 14.3 42.5 43.2 80 70 60 50 0-10% (92-11) >25% (92-11) 0-10% (97-11) >25% (97-11) 40 30 20 10 Figure 3.1.3.6-1: Mean defoliation in two periods (1993-2012 and 1998-2012) 0 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 year Figure 3.1.3.6-2: Shares of trees of defoliation 0-10% and > 25% in two periods (1993-2012 and 1998-2012)
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