[Appraisal of forest soil pollution degree by heavy metals in Baia Mare area]
1999
Ciobanu, C. | Lacatusu, R. | Dulvara, Eufrosina | Latis, L. (Institutul de Cercetari pentru Pedologie si Agrochimie, Bucuresti (Romania))
First, the loading by heavy metals of the forest soils in Baia Mare area is presented, namely in Level I monitoring sites (10 sites in county network 16 x16 km) and in Level II monitoring sites (17 sites in the neighbourhood area of Baia Mare city): the high values for Cu, Pb, Zn and Cd contents in litters and in forest soils the maximum of the contents exceeding by far the maximum admissible limits although some decreases of their contents in the last few years were observed.In the second part of the report it is presented an application of the method proposed by Lacatusu (1995), using the indices of loading/pollution in correlation with clay and organic matter content, in accordance with the correlations established in the Dutch system formulae (1988) presented by Ewers (1991). Using this method high singular pollution degrees (of a single metal) for Level II network were obtained, too, although the calculated reference values are greater than that used till now. Summing the pollution degrees of the four heavy metals (Cu, Pb, Zn, Cd) enabled us to calculate the multiple pollution degree; this value varied from weak to excessive, the greater values being that of the sites situated at a distance of 1-2 km from pollution sources on the direction of dominant winds. The utilization of the new method has the advantage of taking into consideration of the most important soil parameters for the capacity to retain the pollutants (clay and organic matter content), enabling to do a better soil differentation concerning the pollution.
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