Abstract
The crown densities of 186 trees of five common European tree species (Norway spruce (Picea abies), silver fir (Abies alba), Scots pine (Pinus sylvestris), oak (Quercus robur) and beech (Fagus sylvatica) were assessed simultaneously by observation teams from France, Germany and the United Kingdom. Major differences in the scores existed, with the maximum difference on any one tree being 45%. Differences tended to be consistent, with the French team scoring more lightly than the German team and the German team more lightly than the UK team. The differences throw into question the value of international comparisons of forest condition, particularly the use of comparative tables of the extent of “forest decline” in individual European countries.
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References
Anon: 1987, Forest Damage and Air Pollution. Report of the 1986 forest damage survey in Europe. United Nations Economic Commission for Europe, Geneva.
Anon: 1988a, Forest Damage and Air Pollution. Report of the 1987 forest damage survey in Europe. United Nations Economic Commission for Europe, Geneva.
Anon: 1988b, Manual on Methodologies and Criteria for Harmonized Sampling, Assessment, Monitoring and Analysis of the Effects of Air Pollution on Forests. United Nations Economic Commission for Europe, Geneva.
Anon: 1989a, Forest Damage and Air Pollution. Report of the 1988 forest damage survey in Europe. United Nations Economic Commission for Europe, Geneva.
Anon: 1990b, European Community Forest Health Report 1987–1988. Commission of the European Communities, Luxembourg.
Anon: 1990a, Forest Damage and Air Pollution. Report of the 1989 forest damage survey in Europe. United Nations Economic Commission for Europe, Geneva.
Anon: 1990b, European Community Forest Health Report 1989. Commission of the European Communities, Luxembourg.
Innes, J.L.: 1987, ‘The Interpretation of International Forest Health Data’, In: Perry, R., Harrison, R.M., Bell, J.N.B. and Lester, J.N. (Eds.), Acid rain: Scientific and Technical Advances. Selper, London, pp. 633–640.
Innes, J.L.: 1988a, ‘Forest Health Surveys — A Critique’, Environ. Poll. 54, 1–15.
Innes, J.L.: 1988b, ‘Forest Health Surveys: Problems in Assessing Observer Objectivity’, Can. J. For. Res. 18, 560–565.
Innes, J.L.: 1990a, ‘Some problems with the Interpretation of International Assessments of Forest Damage’, In: Proceedingsof the XIX World Congress of IUFRO, Montreal, Canada, 5–11 August 1990. IUFRO, Vienna, pp. 380–387.
Innes, J.L.: 1990b, Assessment of Crown Condition. Forestry Commission Field Book 12. HMSO, London.
Landmann, G.: 1989, ‘La surveillance au sol de l'état sanitaire des forêts: première évaluation rétrospective des résultats françaises (période 1983–1988) et comparaison aved les résultats des pays voisins’, In: La Santé des Forêts 1988, Ministre de l'Agriculture et de la Forêt, 33–51.
Nilsson, S. and Duinker, P.: 1987, ‘The Extent of Forest Decline in Europe’, Environment 28, 4–9, 30–31.
Sanasilva, W.: 1986, Kronenbilder, Eidgenössische Anstalt für das forstliche Versuchswesen, Birmensdorf.
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Innes, J.L., Landmann, G. & Mettendorf, B. Consistency of observations of forest tree defoliation in three European countries. Environ Monit Assess 25, 29–40 (1993). https://doi.org/10.1007/BF00549790
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DOI: https://doi.org/10.1007/BF00549790