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Intensive monitoring of forest ecosystems in Europe : Technical report 2001 / Wim de Vries (2001)
Titre : Intensive monitoring of forest ecosystems in Europe : Technical report 2001 Type de document : Rapport Auteurs : Wim de Vries, Auteur ; G.J. Reinds, Auteur ; H.D. Deelstra, Auteur ; et al., Auteur ; Forest intensive monitoring coordinating institute, Auteur Editeur : Genève [Suisse] : United Nations Economic Commission for Europe UNECE Année de publication : 2001 Collection : Intensive Monitoring of Forest Ecosystems in Europe, ISSN 1020-6078 Importance : 177 p. Format : 21 x 30 cm Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] écosystème forestier
[Termes descripteurs IGN] surveillance forestière
[Vedettes matières IGN] Ecologie forestière
Résumé : (auteur) Apart from an overview of the implementation of the Pan-European Intensive Monitoring Programme of Forest Ecosystems up to 1998, this year's report focuses on water and element fluxes through the forest ecosystem. Furthermore, first results on the assessment of species composition of the ground vegetation are presented. This year's report forms part of a series of thematic reports. Major conclusions with respect to the ground vegetation assessment are:
- Species numbers show a slight North-South gradient with increasing species numbers in the Mediterranean areas compared to the boreal forests, except for some plots in Norway and Finland. This finding is in accordance with common knowledge.
- The species diversity based on abundance weighting according to the Simpson index varied strongly within countries and there were no clear gradients over countries. High Simpson indices (high diversity) are generally associated to plots with a high number of species and very low Simpson indices (low diversity) to plots with only a few species.
Major conclusions with respect to the water and element budgets are:
- Mean yearly interception ranged from approximately 160 mm for Pine and Oak to approximately 250 mm for Beech and 300 mm for Spruce, reflecting the increasing interception capacity of those tree species. Median transpiration fluxes were rather constant among the tree species and ranged from 325 mm.yr1 for Pine to 385 mm.yr"1 for Spruce stands. This is consistent with literature data. Leaching fluxes mainly reflected the difference in precipitation on tree species. Median values increased from approximately 80 mm under Pine stands to 240 mm under Spruce stands.
- At most plots, the leaching flux of SO4 is higher than that of NO3, despite the generally lower input of S than of N, indicating that SO4 is still the dominant source of actual soil acidification. The median sulphur budget is close to zero, but at a considerable number of those sites, sulphur is released by the soil, indicating that these systems are recovering from previous episodes of high sulphate input.
- The leaching of N is generally negligible below throughfall inputs of 10 kg.ha^.yr"1. There is a significant relationship between N leaching and N deposition but no significant relationship was found with the soil C/N ratio. Nitrogen budgets show that at most sites (90%) the N input is higher then the N leaching.
- Variations in BC leaching were significantly related to the S input and the pH and base saturation. The median base cation balance is close to zero, implying a net adsorption and a net release of base cation at approximately 50% of the plots.
- The Al leaching flux was significantly related to the SO4 input, reflected by the fact that sites with a high Al leaching coincide with sites with a high input of SO4. The geographic patterns of both elements, however, did not coincide very well since soil base saturation was also significantly related to the Al leaching flux.
Numéro de notice : 17103 Thématique : FORET Nature : Rapport Permalink :
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Intensive monitoring of forest ecosystems in Europe : Technical report 1997 / Wim de Vries (1997)
Titre : Intensive monitoring of forest ecosystems in Europe : Technical report 1997 Type de document : Rapport Auteurs : Wim de Vries, Auteur ; E.M. Vel, Auteur ; G.J. Reinds, Auteur ; H.D. Deelstra, Auteur ; United Nations Economic Commission for Europe, Auteur Editeur : Genève [Suisse] : United Nations Economic Commission for Europe UNECE Année de publication : 1997 Collection : Intensive Monitoring of Forest Ecosystems in Europe, ISSN 1020-6078 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes descripteurs IGN] écosystème forestier
[Termes descripteurs IGN] surveillance forestière
Numéro de notice : IFN_4254 Thématique : FORET Nature : Rapport Permalink :
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