Suo - Mires and peat vol. 50 no. 3-4 | 1999

Risto Lauhanen, Seppo Kaunisto. Kunnostusojituksen vaikutus rämeiden ravinnetilaan.
English title: Effect of drainage maintenance on the nutrient status on drained Scots pine mires.
Avainsanat: forest drainage; peat; Scots pine; ditch cleaning; complementary ditching; nutrients; needles
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The effects of drainage maintenance on the nutrient contents in peat and Scots pine needles on drained pine mires were studied. The material consisted of twelve Finnish field experiments. Drainage maintenance (increasing ditching intensity; no treatment at all, mere ditch cleaning, mere complementary ditching, and both of them together) was carried out in 1982-1985. The needles were sampled in 1994-1995 and peat in 1996. There were great differences in the site types and consequently also in the peat and needle nutrient concentrations between the experiments. The needle Mn concentrations demonstrated a fairly good drainage status in all the treatments. Drainage maintenance had only minor effects on the nutrient status of peat and needles. Ditch cleaning decreased magnesium, manganese and zink amounts in the surface peat. Increasing the intensity of drainage maintenance increased the 100-needle dry mass, but decreased the needle boron concentrations. Peat and needle nitrogen concentrations increased slightly (not significantly) along with the increased intensity in drainage maintenance. The peat nutrients classified correctly 83.7% of the fertility classes for drained peatlands.
  • Lauhanen, The Finnish Forest Research Institute, Kaironiementie 54, FIN-39700, Parkano, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Kaunisto, Sähköposti: ei.tietoa@nn.oo
Reijo Solantie. Karttoja suo-ojitusten vaikutuksesta Suomen ilmastoon.
English title: Charts of the climatic impact of the drainage of mires in Finland.
Avainsanat: Drainage; mire; climate; foresrty
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Widespread drainage measures, which were carried out mainly in the period 1950- 1990 on Finnish mires, have had significant climatic consequences, part of them being temporary, part permanent. The aim of this study was to prepare charts of these climatic effects by combining three sources of knowledge: (I) the climatic effect of drainage (e, °C), as given by (Solantie 1994, 1998) for a 100% mire area in the climatically most affecting stage, (2) fresh grid-square statistics of the proportion of drained mires compared with the total area, and (3) annual statistics of the proportion of drained mires in various stages having characteristic climatic effects, compiled by the Finnish Forest Research Institute. Three charts show the maximum cooling effect of peatland drainage in Finland during the first 15 years after the drainage in the period 1973-1982, as drained mires in such a stage of drainage were then most common. Two charts show the warming effect after successful afforestation and canopy closure; the canopy acts as a radiation shelter and a mixing generator for the air beneath. In the middle boreal natural zone, that most heavily drained, the mean monthly minimum temperatures in the period 1973-1982 were reduced by 1.5°C and the yearly frost-free period was shortened by 17 days. As a result of successful afforestation, the annual minimum temperature in the middle boreal zone will be raised by 2°C to 3°C by the year 2005.
  • Solantie, The Finnish Meteorological Institute, P.O. Box 503, FIN-00101 Helsinki, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)

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