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# Budgets of Aluminium Species, Iron and Manganese in the Lake Gårdsjön Catchment in SW Sweden

S. Ingvar Nilsson
Ecological Bulletins
No. 37, Lake Gårdsjön: An Acid Forest Lake and Its Catchment (1985), pp. 120-132
Stable URL: http://www.jstor.org/stable/20112941
Page Count: 13
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## Abstract

Fluxes of aluminium, partitioned into dissolved inorganic and organic complexes, and of iron and manganese were measured during two consecutive hydrological years in a catchment on the Swedish west coast. The area is characterized by acid lakes, the surrounding terrestrial parts of the catchment being dominated by shallow podzolic soils with significant inclusions of barren rock and peat soils. Budget calculations for one of the lakes (Lake Gårdsjön), with an average pH of 4.66, indicated an aluminium retention in the lake varying between -0.2 and 8.0 kg $\text{ha}^{-1}\text{yr}^{-1}$ depending on the actual year and on the mode of calculation. The calculated retention of organic aluminium species was 3.1-7.9 kg $\text{ha}^{-1}\text{yr}^{-1}$. Likewise there was a retention of iron (6.0-6.4 kg $\text{ha}^{-1}\text{yr}^{-1}$), while manganese showed an apparent net release (4.9-5.1 kg $\text{ha}^{-1}\text{yr}^{-1}$). The aluminium fluxes were mainly regulated by complex formation with fulvic acids in the organic top soil and by the sulphate concentration in the mineral soil through equilibria with two basic aluminium sulphates (Al(OH)SO₄ and $\text{Al}_{4}(\text{OH})_{10}\text{SO}_{4}$). In the streamwater the measured concentrations could not be uniquely ascribed to any specific equilibrium reaction, although the gibbsite equilibrium was approached during baseflow conditions. Rather few comparable studies exist, but a data compilation showed that the average concentrations were in good agreement with measurements by other authors in catchments both with and without lakes.

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