Tapani Sallantaus , Harri Vasander, Jukka Laine

Metsätalouden vesistöhaittojen torjuminen ojitetuista soista muodostettujen puskurivyöhykkeiden avulla

Sallantaus T., Vasander H., Laine J. Metsätalouden vesistöhaittojen torjuminen ojitetuista soista muodostettujen puskurivyöhykkeiden avulla.

Tiivistelmä

Before large-scale drainage, the outflowing water from forests was naturally filtered through peatlands. The even topography, dense moss cover and the favourable physical, chemical and biological properties of surface peat facilitate versatile buffering functions in these systems. In addition to retaining suspended solids, peatlands may act as traps for nutrients or harmful metals. Major part of these buffering systems have been lost as a result of forestry drainage. Restoring drained peatlands, being potentially well suited to act as a buffer zone between forestry land and a watercourse, is the major reason for rewetting outside nature reserves. Potentially each drainage area should include a restored part through which waters both from the drainage area itself and from the surrounding upland forest catchment would be filtered. Preliminary results from three experimental catchments show that buffer zones restored from drained peatlands may be succesfully used in decreasing the detrimental impacts forestry operations may have on adjacent water courses. Long-term monitoring is, however, required for the quantitative assessment of the buffer efficiency.

Avainsanat
peatland drainage; load; restoration; water pollution

Vastaanotettu 31.10.2017 Julkaistu 1.1.1998

Katselukerrat 698

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