Seppo Eurola , Kaisu Aapala, Aira Kokko

Ojitustilanne Etelä- ja Keski-Suomen sekä Pohjanmaa-Kainuun alueella

Eurola S., Aapala K., Kokko A. Ojitustilanne Etelä- ja Keski-Suomen sekä Pohjanmaa-Kainuun alueella.

Tiivistelmä

The results of a survey of 254 random sample plots, each 1 km2 in area and covering 1 543 km of mire transect line are reported. 74% of the peat-land encountered were drained with open ditch networks for forestry purposes. Of those 19% were classified as recently drained, 66% as transitional, 10% as transformed peat-moor peatlands, and 5% as being under the influence of nearby drainage. Drainage activity had been most often carried out on spruce mires, pine bogs, combination types, and rich fens and to a lesser extent on poor fens/bog hollows. The nutrient status and peat thickness had been taken into account only to a limited extent although ombrotrophic peatlands had been drained to a lesser extent than rich peatlands. There was an increasing tendency to extend drainage activities to thick, ombrotrophic mire types. 17% of peatland under the influence of drainage (750 000 ha) are unsuitable for forestry purposes. Considered within each unsuitable mire type more than 50% of their area is drained. Keywords: Drainage, Finland, mire types, peatland

Avainsanat
Drainage; Finland; mire types; peatland

Vastaanotettu 31.10.2017 Julkaistu 1.1.1988

Katselukerrat 3222

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