Forest Condition in Europe - ICP Forests

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30 Forest Condition in Europe 2013 Figure 3.1.2-8: Mean plot defoliation for evergreen oak, temperate oak (Quercus coccifera, Quercus ilex, Quercus rotundifolia, quercus suber, 2012
Forest Condition in Europe 2013 31 3.1.3. Defoliation trends: time series is presented for the periods 1992-2012 and 1997-2012 in graphs and in tables. Graphs show the fluctuations of mean defoliation and shares of trees in defoliation classes over time. The maps depict trends in mean defoliation from 2002-2012. Whereas all plots of the countries mentioned above are included for the two respective time periods in graphs, the maps of the trend analysis only represent plots within these countries that were included in all of the surveys. In the last years plots were shifted within Finland and parts of northern Germany (Brandenburg). These plots are not depicted in the maps but the countries are included in the time series calculation. The temporal development of defoliation is expressed on maps as the slope of linear regression of mean defoliation against the observation year. It can be interpreted as the mean annual change in defoliation. These slopes were statistically tested and considered as ‘significant’ only if there was at least 95% probability that they are different from zero. Besides the temporal development, also the change in the results from 2010 to 2012 was calculated. In this case, changes in mean defoliation per plot are called ‘significant’ only if the significance at the 95% probability level was proven in a statistical test.
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Forest Condition in Europe - ICP Forests

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