Natura Croatica, Vol. 12 No. 4, 2003.
Izvorni znanstveni članak
The geochemical background in Istrian soils
Z. Peh
S. Miko
D. Bukovec
Sažetak
The geochemical background is postulated for two major groups of soils of the Istrian Peninsula, depending on the type of bedrock, or parent material as one of the main soil-forming factors. An effort is made to combine conceptual fundamentals of non-linear dynamic theory with the principles, methods and practical application of basic statistics in order to elucidate the nature and origin of elemental subpopulations hidden in the original geochemical data of Istrian topsoils. In this sense, the 4σ-outlier test and iterative 2σ-statistical technique are utilized, by which the outliers and anomalous values are removed from the total data set and assigned to the consequences of non-linear system dynamics, which prevents the development of a simple cause-and-effect relationship between geochemical variables. The geochemical background is then defined as the normal range of data of the remaining data set. As confirmed by the study, the carbonate-derived soils have a higher natural or geogenic baseline and are also more strongly loaded with heavy metals and other trace elements, in some places critically. On the other hand, flysch-derived soils, except for higher Ca contents, are actually depleted in many elements and also devoid of outliers. Such behaviour implies »dilution« due to the characteristic nature of the weathering of the underlying parent material and other soil-forming processes controlling their fate. In a general sense, the character of the probability distribution curves among chemical elements in the topsoil (or soils in general) can be used as reliable indicator of their evolutionary trends, that is, their enrichment or depletion, or, as regards the geochemical background, the equilibrium between the two, which in the case studied depends principally upon the contrasting Istrian bedrock lithology.
Ključne riječi
geochemical background; topsoil; parent material; geogene influence; human impact; normal distribution; normal range; Istria; Croatia
Hrčak ID:
10760
URI
Datum izdavanja:
31.12.2003.
Posjeta: 2.205 *