engleski

Characteristics and classification of three urban soils in the Sisak City, Croatia

Many soil classifi cation systems (including Croatian Soil Classifi cation - CSC) do not treat urban (technogenic) soils adequately. Moreover, in diff erent parts the world, diff erent names for similar urban soils are oft en used. All this hampers eff ective management of these increasingly important soils. The main aim was to classify three typical Sisak City soils according to CSC and international WRB system. Additional aim was to assess soil contamination by heavy metals. In two soil profi les pedogenetic A horizon was formed. Hence, according to CSC, we classifi ed these soils as Rendzinas and not Technogenic soils. Given that CSC does not include a subtype of Rendzina on deposited land material, it was proposed. In one profi le, topsoil organic matter accumulated mainly due to human activity, so it was classifi ed according to CSC as a Deposol on land material. Since CSC offers no criteria for further systematization of Deposols, we proposed some. According to WRB, two soils were systemized as Technosols, but one was not. Namely, since one soil did not contain enough artefacts to qualify as a Technosol, it was classifi ed as a complex (buried) soil (Regosol over Retisol). However, qualifi er Relocatic could be used to indicate dominant human infl uence on this profi le. Compared with CSC, WRB was more suitable for classifying these soils. Accordingly, CSC should be updated. According to the reference threshold for parks and recreational areas, heavy metals contents were below maximum allowed values in each soil. However, contents of some metals were over the threshold for agricultural soils.

Technosols, Croatian soil classification system, WRB, Soil heavy metals

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