Report - ICP Forests

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10 Summary Ground vegetation was analysed based on the data from 776 intensive monitoring plots from 28 countries. In multivariate statistical models, predictor variables from the intensive monitoring data base were used to explain the occurrence and change of plant species composition. The composition of the ground vegetation mainly depended upon the traditional factors soil, climate and dominant tree species. But in contrast to earlier evaluations based on less comprehensive data sets, there were in addition clearly significant effects of nitrogen deposition on present vegetation species composition. Based on Ellenberg indicator values, a significant change over time towards nitrophytic species could be shown as well and could be linked to nitrogen deposition.
11 1. INTRODUCTION In the present report the results of the 23 rd European-wide crown condition survey conducted by ICP Forests and EC in the year 2009 are presented. Moreover, the report presents results of analyses of the intensive monitoring of ICP Forests and EC. The report is structured as follows: Chapter 2 describes the sampling of the plots and the trees, the assessment of crown condition, the analyses of the monitoring data, and the results of the large-scale (Level I) survey. In the description of the spatial and temporal variation of crown condition at the European-wide scale, emphasis is laid upon the current status and the development of crown condition with respect to species and regions. Chapter 3 presents latest results of the intensive (Level II) monitoring. First of all, the annually reported results of the measurements of bulk deposition, throughfall deposition and their trends are updated for ammonium, nitrate and sulphate. In contrast to earlier evaluations time trends are presented for a longer time span of 10 years. In the following subchapter a descriptive analysis of soil solution data as well as a comparison with tree species specific critical limits are presented. Critical limits are derived from literature. The development of soil solution pH is included as well. Ground vegetation data from over 700 intensive forest monitoring plots are the basis for a study aiming at detecting spatial and temporal trends of ground vegetation and the related predictor variables. The integrated monitoring of several ecosystem compartments in combination with modelled deposition data provides a unique basis for this evaluation. Chapter 4 consists of national reports by the participating countries, focussing on crown condition in 2009 as well as its development and its causes. Maps, graphs and tables concerning the transnational and the national results are presented in Annexes I and II. Annex III provides a list of tree species with their botanical names and their names in official UNECE and EU languages. The statistical procedures used in the evaluations are described in Annex IV. Annex V provides a list of addresses.
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158 Annex Expert Panel on Crown Con
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160 Annex FFCC FSCC Bundesforschung
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162 Annex BELGIUM Tel. +32 54 43 71
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164 Annex DENMARK Phone: +45 39 47
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170 Annex SERBIA Phone: +381 11 3 5
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172 Annex Ukraine (NFC) (Min) Unite
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174 Annex
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Report - ICP Forests

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