Artikkelit jotka sisältää sanan 'precipitation'
Sadannan vaikutus vedenpinnan tasoon kohosuolla.
English title: Impact of precipitation on the water table level of different ombrotrophic raised bog complexes, central Estonia.
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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.
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Valgma,
Institute of Ecology, Kevade St. 2, Tallinn, EE 0001, Estonia
Sähköposti:
ei.tietoa@nn.oo
Kasvukautiset vaihtelut pohjois-italialaisen suon vesikemiassa.
English title: Seasonal changes in water chemistry in a bog on the Southern Alps.
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Concentrations of sodium, potassium, calcium and magnesium were periodically measured in precipitation and in pool water in a bog on the Southern Alps during the 1991 vegetative season. A simple model was established for calculating theoretical concentrations of those cations in bog water, taking into account the effect of potential evapotranspiration. The actual concentrations of cations in bog water were then compared with the theoretical ones and this allowed to define different seasonal patterns of cation concentrations. Sodium accumulated in bog water with respect to precipitation, to an extent far exceeding the enrichment due to evaporation. A possible explanation of this resides in a surface enrichment owing to capillary flow. Potassium, and to a lesser extent magnesium, accumulated in spring and autumn but were actively removed by plants in summer. Calcium was removed also outside the growing season, probably by cation exchange on peat.
Keywords: bog water, cations, evapotranspiration, precipitation, seasonal variation.
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Bragazza,
Faculty of Agricultural Sciences, University of Padua, Via Gradenigo 6, 1-35131 Padua, Italy
Sähköposti:
ei.tietoa@nn.oo
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