Decreased Deposition Of Sulphate And
The Responses In Soilwater At Estonian
Integrated Monitoring Sites 1995–2004
Author(s)
J. Frey, K. Pajuste, K. Treier, Ü. Mander, P. Kask & T. Frey
Abstract
This paper presents the results of trend analyses of a ten-year study of deposition
(throughfall+stemflow) and soilwater in two pine stands and a spruce stand (ICP
IM areas). The reported decreasing trends of deposited sulphate and cations at
the easterly located Saarejärve integrated monitoring area are in good agreement
with the decline of SO2 and fly ash emissions in Estonia. At Vilsandi pine stand,
which has the westernmost location and is under a marine influence, the decrease
of sulphur deposition was comparable with that of the eastern Saarejärve pine
stand. However, total base cation load in Vilsandi pine stand remained
unchanged resulting in a decrease of throughfall acidity. At Saarejärv coniferous
stands deposition of base cations decreased more than that of acid anions causing
an increase in K leaching from canopies. A good accordance between sulphate
decline in deposition and topsoil water was accompanied by base cation decline
in soilwater under organic horizon at both IM areas. In podzolized soil at
Saarejärve the decline of SO4 and base cations resulted in increased levels of
total soluble Al.
Keywords: deposition, throughfall, stemflow, pine and spruce stand, soilwater,
sulphate, cations, aluminium, trend analyses.
1 Introduction
Predominant sources of SO2 and particle emission in Estonia are four large oilshale-
based thermal power plants and chemical industries in the Northeastern
region. Oil shale mining and combustion accounted for about 81% of total
Keywords
deposition, throughfall, stemflow, pine and spruce stand, soilwater,
sulphate, cations, aluminium, trend analyses.
Related Book
Other papers in this volume
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