Limit values indicating vulnerability of ecological functions of fluvisols in the region stredné Pohronie [Slovak Republic]
2005
Makovníková, J.,Soil Science and Conservation Research Institute, Bratislava (Slovak Republic)
In this paper evaluation of the main indicators of selected ecological Fluvisol functions (filtration, accumulation, buffering) regarding inorganic contaminants (heavy metals) is presented. The factor analysis shows the main indicators that potentially influence selected ecological functions of soil regarding heavy metals. There are direct indicators like mobile content and total content of heavy metals, soil pH value and indirect indicators like content and quality of organic matter, soil texture, depth of humic horizon and soil texture. Critical values that determine soil vulnerability of ecological functions are multidimensional, developmental numeric or point evaluating values. The soil samples of fluvisols, located in Stredne Pohronie region, used as arable land developed on recent river sediments were collected from the depth 0 - 10 cm. Soil reaction, content of organic matter, exchange cations and the first step of sequential chemical extraction method proposed by Zeien and Brummer [ref. 10] to determine mobile contents of Cd and Pb were used. Testing values of critical metals contents and mobility in relation to soil properties were derived. Critical values by law 220/2004 (law of agricultural soil protection) for system soil - plant were taken for starting values in stepwise multiple regression. Critical values of indicators were determined proposed multiple regression analysis for Cd: Cdm 1.0 mg per kg, pH 5.47, COX 1.59, exchangeable Ca2+ 4.35 cmol per kg, for Pb: Pbm 0.1 mg per kg, pH 6.4, COX 1.99, exchangeable Ca2+ 6.79 cmol per kg.
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