Suo - Mires and peat vol. 56 no. 4 | 2005
Kavillisuus puutomana pidetyllä metsäojitusalueella.
English title: Vegetation on an artificially treeless drained mire.
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In this study the vegetation composition of a drained mire that was partly forested and partly kept treeless was compared. The study site was a low sedge fen near the town Oulu in west central Finland. Drainage was carried out in the 1930s. A power transmission line was drawn through the fen in 1956. The area under the line was kept treeless through repeated cleanings. In summer 2004 the vegetation was inventoried on a study area half of which was on the treeless and half on the forested part. The forested and treeless parts were similar with respect to mire site type, depth of peat layer and efficiency of drainage. Therefore the effect of the tree stand on the vegetation on the forested part was obvious. The secondary succession of the vegetation had been significantly slower on the treeless part. Practically no forest moss species, but also fewer Sphagnum moss species were found on the treeless part. On the other hand, a number of sedge-like plants were found only there. With regard to species number and coverage, the largest group was dwarf shrubs, especially on the forested part.
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Silfverberg,
Metsäntutkimuslaitos, Vantaan toimintayksikkö (Finnish Forest Research Institute, P.O. Box 18) PL 18, FIN- 01301 Vantaa, Finland
Sähköposti:
ei.tietoa@nn.oo
- Seväkivi, Sähköposti: ei.tietoa@nn.oo
Turvekerroksen ajoittaminen vulkaanisen tuhkan avulla.
English title: Experiments on the taphonomy of tephra in peat.
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Understanding the taphonomy of tephra (volcanic ash) is crucial to the use of tephrochronology in peatlands. This study uses field experiments on a Scottish peatland to investigate the post-depositional movement of tephra in peat. Experiments were designed to investigate the temporal change in tephra profiles over a 24-month study period, the horizontal distribution of tephra and the microscopic distribution of tephra particles within the peat. Tephra concentration profiles show that the majority of tephra shards are retained within the top cm of peat with small numbers penetrating to a maximum of 6 cm depth. This distribution would be reduced as the peat is compressed with subsequent accumulation. Examination of thin sections from the plots indicates that tephra movement may be dependent on the microscopic structure of the peat, especially porosity. These results provide general support to the use of tephrochronology although further work will be required, particularly in other peat types and environments.
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Payne,
Department of Geography, Queen May, University of London, Mile End Road, London E1 4NS United Kingdom
Sähköposti:
ei.tietoa@nn.oo
- Kilfeather, Sähköposti: ei.tietoa@nn.oo
- van, Sähköposti: ei.tietoa@nn.oo
- Blackford, Sähköposti: ei.tietoa@nn.oo
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