The biogeochemistry of basic cations in two forest catchments with contrasting lithology in the Czech Republic

摘要: The biogeochemistry of Ca, Mg, K, and Nawere investigated in two forested catchments theCzech Republic, one underlain by leucogranite, theother serpentinite. High weathering rates at theserpentinite site Pluhův Bor resultedin Mg2+ as the dominant cation on soilexchange complex drainage water. Other basiccations (Ca2+, K+, Na+) showedrelatively low concentrations outflow instreamwater. catchment exhibited high basesaturation mineral soils (>70%), nearneutral soil stream pH, despite elevated inputsof acidic deposition. Slow growth Norway spruceat may be caused K deficiency, Mgoversupply and/or Ni toxicity. In contrast, thegranitic Lysina showed ofbasic cations exchange Soil water werehighly impacted pH wasextremely (<4.5) throughout soilprofile, base saturation soilwas very (<5%). Supplies basic cationsfrom atmospheric deposition processes wereless than inputs SO2-4 anequivalence basis, resulting highconcentrations total Al Needle yellowing spruce was possibly theresult Mg deficiency Lysina. Because theirextremely different lithologies, these catchmentsserve valuable end-members ecosystemsensitivity to levels acidicdeposition.