The effect of decarbonation on humus composition in Serbian rendzina soils
2008
Cupac, S., University of Belgrade, Belgrade - Zemun (Serbia). Faculty of Agriculture | Djordjevic, A., University of Belgrade, Belgrade - Zemun (Serbia). Faculty of Agriculture | Tomic, Z., University of Belgrade, Belgrade - Zemun (Serbia). Faculty of Agriculture
The effect of decarbonation on group and fractional composition of humus in rendzina soils was investigated in 24 profiles of calcaric and 9 profiles of non-calcaric rendzina soils in different parts of Serbia that are characteristic of that soil type. One or two samples, depending on soil depth, were collected from horizon A and one from each transitional AC horizon in profiles where the AC horizon has developed. The more alkaline the soil pH is in highly and very highly calcareous profiles, the greater is increase in mobile fractions and decrease in stable fractions of humic and fulvic acids. Decarbonation was found to have a significant statistical effect on the fractional composition of fulvic acids (the content of their mobile fractions 1a and 1 increased, while fraction 3 decreased), and the content of mobile humus (sum 1) increased, while stable humus content decreased (sum 2). However, stable humus was still found to account for over 80% even in non-calcaric rendzinas. The process of decarbonation was not found to affect the group composition and type of humus, or the fractional composition of humic acids.
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