Luca Bragazza

Kasvukautiset vaihtelut pohjois-italialaisen suon vesikemiassa

Bragazza L. Kasvukautiset vaihtelut pohjois-italialaisen suon vesikemiassa.

Tiivistelmä

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.

Avainsanat
bog water; cations; evapotranspiration; precipitation; seasonal variation

Vastaanotettu 31.10.2017 Julkaistu 1.1.1993

Katselukerrat 1926

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