THE EFFECTS OF BOREAL VEGETATION AND PODZOLIC SOILS ON HYDROCHEMISTRYAT HOYLANDET (MID-NORWAY)

During the Surface Water Acidification Programme, a hydrochemical plot study was carried out at the pristine Hoylandet study site during 198 6-89. The plot soils were acidic iron podzols (sensu Kubiena), with a significant content of secondary aluminium (Al), forming a potential m ajor source of toxic Al in streams and lakes. Rain and mist inputs con tain small amounts of anthropogenic sulphate, with ammonium inputs bei ng enhanced during the summer months. Vegetation canopy interactions, including sorption and leaching, change input water chemistry before i t reaches the soil, in which organic interactions increase, especially during the summer. Amphibole in the soil parent material is probably responsible for the large mineral weathering rate determined and this source of base cations, allied with the small anthropogenic inputs, re sults in Al concentrations in the streamwater being small in compariso n with impacted sites.