Suo - Mires and peat vol. 39 no. 3 | 1988
Metsäojitettujen soiden kasvupaikkaluokituksen suunnanhakua.
English title: The need of improving the site classification of mires drained for forestry.
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Tekijä
A review of the historical development of mire site classification in Finland with special emphasis on the studies and theories of post-drainage succession is made. Some criticism of the prevailing classification system is presented and a work model for guiding further study of drained mire classification is proposed. Preliminary results of a new approach to classify the vegetation of old peatland forests using TWINSPAN classification and DCA ordination techniques are presented.
Keywords: Drainage, mire classification, site type, succession
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Reinikainen,
The Finnish Forest Research Institute, Department of Peatland Forestry, P.O. Box 18, SF-01301 Vantaa, Finland
Sähköposti:
ei.tietoa@nn.oo
Kaivukoneiden ajankäyttö ja tuottavuus metsäojituksessa.
English title: Time consumption and productivity of excavators in forest drainage.
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The distribution of effective time, output and work quality of three medium-sized excavators were observed in a time study. The distribution of operation time and productivity were included in a follow-up study. Digging time varied between 81-91%. Average availability was 85% and the productivity/operation time 157 m/h during ditch digging. The corresponding values during ditch cleaning were 89% and 221 m/h.
Keywords: Digger, ditching, effective time, excavator, operation time
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Salo,
Pappilantie 2, SF-60550 Nurmo, Finland
Sähköposti:
ei.tietoa@nn.oo
Ojituksen vaikutuksesta soiden kenttäkerroksen kasvilajeihin.
English title: Changes in the ground vegetation of drained mires.
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The aim of this research was to study how some species of mire plants with differing ecological characteristics react to environmental changes caused by drainage. The data has been collected from 254 sample plots, each 1 km2 in area, in the southern and middle part (60-66°N) of Finland during the years 1984-1986. The occurrence of each species was studied both in virgin and in drained peatlands, and the note about mire type and drainage succession stage were recorded. For cloudberry (Rubus chamae-morus), the abundance of vegetation and berries were also indicated. There is a clear decline in the appearance of sedge plants as the succession, caused by ditching proceeds. Of herbs, Athyrium filix-femina and Cirsium palustre, become more common after drainage, but the flark level species, Drosera anglica and Lysimachia thyrsiflora disappear. As the drainage proceeds there is a clear decline in the vegetation and berry production of cloudberry. On the most effectively drained peatlands, more than half of the observations of cloudberry vegetation and all the observations of berry produce, indicated scanty growth and crop. The most abundant vegetation and yield of berries occurred in virgin peatlands.
Keywords: Drained mires, ground vegetation change, Rubus chamae-morus, succession
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Aapala,
University of Oulu, Department of Botany, Linnanmaa, SF-90570 Oulu
Sähköposti:
ei.tietoa@nn.oo
- Kokko, Sähköposti: ei.tietoa@nn.oo
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