Humus formation in weakly developed, hardly eroded soils, formed on soft soilforming rocks
1997
Teoharov, M. | Filcheva, E. ("N. Poushkarov" Institute of Soil Science and Agroecology, Sofia (Bulgaria))
Humusformation in 7 profiles of weakly developed hardly, eroded soils (regosols, areronosols), formed on soft rocks have been studied. These profiles are characterized with type (A) C or AC formulas. Acoording to the criteria of Grishina and Orlov the studied soils can be described as having very low (up to 2 percent) humus content. The ratio Ch;Cf is about I or over than one. The humus composition data show that the humic acids are represented by Ca- complexed (100 percent). This type of connection have a relative character and has no a favourable effect on their structure and properties. The active physico-mechanical processes of migration persist in the thermic-xeric and mesic xeric temperature and water regime. The process of migration is conditioned from the soft soilforming roks, contrast topography and the sharp form of the climatic influence. Regardless that humic acids are Ca complexed (100percent), soils from the North - West Bulgaria are characteristized with humic type of humus and these from the South West Bulgaria are characterized with humic-fulvic type of humus. This determine the different humusforming processes and soil properties closed to the chernozems and luvisols respectively.
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