Monitoring of forest soils - objectives and preliminary results
1994
Sepp, R. | Asi, E. (Estonian Forestry Inst., Tartu (Estonia))
The subject discussed in the present paper is related with the ICP Forest. The investigation of the contents of Pb, Cd, Hg and Zn in the forest soils was carries out on 43 forest monitoring sample plots. On the basis of the data obtained by analysis of the soil samples, it was possible to state that the contents of studied heavy metals in the forest soils are very variable, especially the contents of Cd and Hg. The contents of the haevy metals showed a clear direction to diminish to depth of the soil-profile, but the variation showed a clear tendency to increase. Differences were established in the contents of Pb, Hg and Zn in the forest soils between the North-Eastern and South-Western parts of Estonia. The contents of these elements were higher in the South-Western part of Estonia according to 31,94 and 60 %, but the contents of Cd didn't show significant differences. By comparison with the scale of ecological standards of the heavy metals of the contents of the studied heavy metals in the forest soils were all significantly lower than the lowest degree of the classification
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