Suo - Mires and peat vol. 49 no. 1 | 1998

Ülle Valgma. Sadannan vaikutus vedenpinnan tasoon kohosuolla.
English title: Impact of precipitation on the water table level of different ombrotrophic raised bog complexes, central Estonia.
Avainsanat: precipitation; raised bog; water table level
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The impact of precipitation on the water table level of different complexes on an ombrotrophic raised bog during a year (long-term effect) and a rain shower (short-term effect) was investigated on the basis of the data collected in the Männikjärve raised bog, Central Estonia, over the period of 1956-1991. The regression analysis showed that the effect of precipitation on the mean annual level of the water table depended on the bog complex and time-span considered. In the long-term scale the mean annual water table level depended strongly on the water table level of the previous year. The yearly amount of precipitation affected the water table level of the current year less. These effects were greater in the central pool-ridge complex than in the marginal pine bog forest. On the short-term scale, prerainfall water level affected the water level rise less than the amount of rainfall. The water level rise depended on the prerainfall water level in the central part of the bog (R2 = 0.22), but not in the marginal pine bog forest (R2 = 0.04). The effect of rainfall was of greater importance, explaining as much as 67-75% of the variation in the water level rise.
  • Valgma, Institute of Ecology, Kevade St. 2, Tallinn, EE 0001, Estonia Sähköposti: ei.tietoa@nn.oo (sähköposti)
Antti Wall, Juha Heiskanen. Metsitettyjen turvepeltojen maan fysikaaliset ominaisuudet.
English title: Physical properties of afforested former agricultural peat soils in western Finland.
Avainsanat: Bulk density; organic matter; water retention; peat fields; soil aeration
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The bulk density, organic matter content and soil water-retention characteristics of twenty-one afforested former agricultural peat soils were studied. Soil samples were collected from 5-10 cm, 15-20 cm, 25-30 cm and 35-40 cm soil layers. The studied soils' physical properties differed from those of undrained peatlands and peatlands drained for forestry mainly due to the mixing of mineral soil with the peat during cultivation. In the case of thick peat soils (peat layer >30 cm), the bulk density was at a maximum (0.37 g cm-3) and the organic matter content at a minimum (54%) in the uppermost soil layer. In the case of shallow peat soils (peat layer <30 cm), bulk density increased and organic matter content decreased with increasing soil depth. In thick peat soils, total porosity and water retention at selected matric potentials were at their highest in the lowermost soil layer while in shallow peat soils, the uppermost soil layer possessed the highest total porosity and water retention. Most of the water was retained within the range -100 to -1500 kPa in both soil types. This indicated that small pores were predominant. Air-filled porosity at -10 kPa matric potential (about field capacity) was, on average, 16% in thick peat soils and 17% in shallow peat soils in the uppermost soil layer and decreased with increasing soil depth. The results suggest that the physical properties were generally rather unfavourable for adequate soil aeration and water availability as needed for satisfactory tree growth.
  • Wall, Finnish Forest Research Institute, Kannus Research Station, Box 44, FIN-69101 Kannus, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Heiskanen, Sähköposti: ei.tietoa@nn.oo

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