Calcic and petrocalcic horizons (Bk and Bkm, respectively) commonly occur in soils of arid andsemiarid regions. Studies carried out to investigate the source of calcium in CaCO3 formation haveshown that dust and parent materials represent the main sources.The aim of this study was to investigate if gypsum may be a source of calcium for calciumcarbonate formation and, eventually, to quantify it. Five soil pedons, developing on “Serie Gessoso-Solfifera”, were selected in a very representative forest Mediterranean ecosystem in Sicily (I).Pedons were opened, described in field and sampled according to the sequence of genetic horizons.Soil samples were analyzed to investigate 87/86Sr ratio in leached and residual soil fractions as wellas total amount of carbonates and gypsum.Results allow us to assert that gypsum may be an important source of calcium for pedogenic CaCO3formation in the investigated soils. The amount of calcium arising from gypsum change not onlyamong the pedons but also among the horizons of the same pedon depending on its chemical andphysical features.
|Numero di pagine||9|
|Stato di pubblicazione||Published - 2004|