Pedogenesis of Technosols from Chukurovo Соаl Basin in Intiman Sredna Gora

Abstract

The paper deals with the genesis and soil-forming changes in Technosols formed in the closest vicinity of Chukurovo mine, Gabra village territory. These soils were reclaimed approximately fourteen years ago. They are some of the most oldest technogenic soil formations in Bulgaria. For determination of pedogenetic changes, three different areas of micro relief had been studied applying the catena method. The geoanalysis hold included studies of genetic, geographical, morphological, chemical and physical-mechanical soil status. Obtained results showed that pronounced accumulation initial processes of nutritients and weathering products occur in the studied soils. These contemporary processes lead to a formation of clearly visible genetic horizons with poor structure and low depth. The initial soil-forming process in organic horizons passes with predominance of free fulvic and humic acids, which determine its similarity with forest soil-forming process.
The main factor determining the geological characteristics of The chnogenic soils are parent materials that form macroareas with the contrasting medium reaction - from slightly acidic to slightly alkaline.
Soil physic-mechanical properties have not been changed in course of the contemporary weathering and soil-forming processes. Vertical profiles redistribution of mechanical fractions is not established as well аs in the catena horizontal direction.