THE HEAVY METALS ABUNDANCE IN SOILS FROM FĂGĂRAŞ DEPRESSION II. Fe, Mn, Ni, Pb, Zn

Făgăras Depression soil cover consists of a mosaic of soils where are prevalentProtisols represented by Fluvisols (39.2%), Luvisols represented by Luvisols and HaplicLuvisols (38.8%), Cambisols represented by Distric Cambisols and Eutric Cambisols (12.5%)and Hydrisols represented by Gleysols, Stagnosols and Histosols (7.5%). FăgărasDepression soils, predominantly acid, with low content of humus and total nitrogen and a poorsupply with phosphorus and potassium mobile forms present total contents of Fe, Mn, Pb andZn lower than normal contents values in soils, except Ni that exceeded this indicator. Thehighest amounts of heavy metals have been found in Cambisols and in Hydrisols and thelowest, in Luvisols. Area distribution of the five analyzed heavy metals highlighted zones ofconcentration, either for each element and/or for multiple elements. Thus, from east to westhave been separated Mândra-Şercaia areas for higher levels of the Fe, Mn, Ni, on the westsouthwestof the Fagaras, zones for higher levels of the Fe, Mn, Pb, Zn, and to the northnorthwestof the Victoria town, zones for Mn, Pb and Zn. Frequency histograms aresymmetrical and platicurtice, except zinc that has a leptocurtice shaped curve, and Lead andzinc that have a strong asymmetry of left. Inverse proportionally relationships between pH andheavy metal content, statistically assured for Fe, Pb and Zn; direct proportionality relationship,statistically assured between Fe and Pb on the one hand, and between humus and total N, onthe other hand. The contents of mobile forms of P and K are significant, directly correlatedwith Mn and Ni. Mostly direct proportionality relationships between the analyzed heavy metalsin soils of Fagaras Depression have been set, suggesting their common origin, namely,altered minerals from crystalline rocks on the northern slope of Fagaras Mountains.