Limit values indicating vulnerability of environmental functions of Cambisols
2002
Makovnikova, J (Soil Science and Conservation Research Institute, Bratislava (Slovak Republic))
Critical values indicating soil vulnerability of environmental functions are multidimensional, developmental numeric or point evalueting values. The soil samples of Cambisols, located in Kysuce region used as arable land developed on Flysh belt, were colocted from the depth 0-10 cm. The aggregates were separeted into a surface and core fraction combines rapid freezing and wet seaving of aggregates. Soil reaction, content and quality of organic matter, CEC, content of soil particle 0.01 mm were determined and the sequential chemical extraction method proposed by Zeien and Brummer was esed to determine mobile content of Cd, Pb, Zn, Cu. Plant samples (oat) were separeted into a root, straw, grain and total content of Cd, Pb, Zn, Cu was determined. In surface of aggregates were determined statistically significant higher values of mobile Cd, Pb, Zn. Testing values of critical metals contets and mobilities in relation to soil properties were derived. Starting values in testing plant is taken for critical in plant standards. Critical values of indicators were determined proposed multiple regression analysis for pre Cd : Cdm 1.029 mg/kg, pH 5.47, Cox 1.23, CEC 147.56 mmol/kg, for Pb : Pbm 0.30 mg/kg, pH 3.75, Cox 2.75, CEC 198.89 mmol/kg, for Cu : Cum 0.25 mg/kg, pH 3.50, Cox 2.99, CEC 209.34 mmol/kg, for Zn : Znm 5.00 mg/kg, pH 5.37, Cox 1.17, CEC 142.94 mmol/kg
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