Eurasian Soil Science

, Volume 43, Issue 11, pp 1255–1262 | Cite as

Intrahorizon differentiation of the structural-functional parameters of the humic acids from a typical chernozem

Soil Chemistry


It is shown that some structural-functional parameters of humic acids from the surface (0–5 cm) layer of a typical chernozem differ from those in a deeper (5–20 cm) layer. The Cha-to-Cfa ratio in the surface layer is by 1.7 times lower, and the concentration of free radicals is by almost an order of magnitude lower than that in the layer of 5–20 cm. The stimulating effect of humic acids from the surface layer on the processes of photosynthesis is sharply retarded, whereas their effect on respiration of Chlorella vulgaris is more pronounced. Humic acids from the deeper layer of chernozem have a much stronger stimulating effect on photosynthesis and a very weak stimulating effect of respiration. The concentration of free radicals in humic acids and the activity of physiological processes of photosynthesis in Chlorella vulgaris display a tight correlative relationship.


Photosynthesis Humic Substance Humic Acid EURASIAN Soil Science Soddy Podzolic Soil 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  1. 1.St. Petersburg State UniversitySt. PetersburgRussia
  2. 2.Zoological InstituteRussian Academy of SciencesSt. PetersburgRussia

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