Water chemistry in three Czech monolithologic and geochemically contrasting catchments

Pavel Kram1, Anna Lamacova1, Jakub Hruska1, Oldrich Myska1, Jan Curik1, Frantisek Veselovsky1, Veronika Stedra1
1 Geochemistry, Czech Geological Survey

O 13.7 in Czech-German exchange on environmental-, soil- and hydro(geo)logical issues

30.05.2014, 14:00-14:20, H18, NW II

Three small catchments are situated 5-7 km apart in the Slavkov Forest, western Czech Republic and are forested by spruce (Picea abies). They have a similar area, altitude, temperature, and atmospheric deposition but geochemically differing bedrocks (Kram et al. 2012). Granitic Lysina catchment (LYS) is in several research networks (GEOMON, Oulehle et al. 2008; SoilTrEC CZO, Banwart et al. 2012; ICP IM, Holmberg et al. 2013; ICP Waters and ILTER. Serpentinitic Pluhuv Bor (PLB) and amphibolitic Na Zelenem (NAZ) catchments are included in the SoilTrEC project as paired sites. Hydrochemical monitoring started in 1989 (LYS), 1991 (PLB) and 2001 (NAZ). Bulk precipitation and throughfall samples were collected monthly, stream water mostly weekly. Soil water was collected monthly using zero-tension lysimeters placed in 10 cm and 20 cm depths and using tension lysimeters placed at three depths (30 cm, 60 cm and 90 cm). Ground water was sampled from 26-30 m deep boreholes. Laboratory methods of water analyses were described in detail in Kram et al. (2012). Computer models were used for predictions of hydrological  (BROOK, PIHM) and geochemical patterns (MAGIC). PLB represented sites with very high resilience to anthropogenic acidification due to geogenic reasons. Stream water at PLB exhibited the highest median pH (7.7), alkalinity (0.99 meq/l), Mg (18 mg/l) and Ni (0.1 mg/l). Stream water at NAZ exhibited fairly high resilience to acidification and well balanced concentration of bedrock base cations and therefore intermediate concentrations of Mg (3 mg/l) and the highest concentrations of Ca, Na, and K in stream water. However LYS exhibited extremely low resilience to acidification. Stream water at LYS had very low median pH (4.3), negative alkalinity (-0.05 meq/l), low Mg (0.4 mg/l) and high concentrations of toxic inorganic monomeric Al (0.3 mg/l). MAGIC model simulations suggested that the contrasting stream water compositions in the studied catchments were generated mainly by differences in chemical weathering rates of base cations (Kram et al. 2012). Very slow acidification recovery of drainage waters is predicted for the next decades. Hydrological predictions for the end of the century show decrease in runoff with changes in seasonal patterns, especially with much lower runoff in the summer and early autumn.

Recent research was supported mainly by the European Commission (FP7 SoilTrEC 244118).


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Letzte Änderung 06.11.2013