Influence of land-use and paleocryogenic microrelief on biological properties of black earth from the protection regime «Stone steppe»

It is shown, that most distinctly the difference between black earth on blocks and in interblock lowerings of microrelief is characterized with a parameter of relative quantity of carbon in the microbal biomass, expressed in percentage of contents Сорг. In interblock lowerings in the upper part of humic horizons the relative quantity of microbal biomass in steppe soils in 3-5 times more, and in the bottom part of profiles of these soils, on the contrary, is essential less (approximately in 2 times), than in arable black earth. On blocks in all horizons of steppe sites soils relative activity of microorganisms essentially above, than in arable black earth. The correlation analysis of interrelation of various physical and chemical characteristics of soils with parameters of biological activity has shown, that the closest positive connection of quantity allocated С-СО2 is marked with the contents of carbon and potassium which factors of correlation make 0,82-0,83 and 0,47-0,51. Factor analysis of parameters only humic horizons on all researched soils in "Stone steppe" has shown, that the most powerful factor (36,4%) of their formations is lithogenic (it is determined by a compound of edaphic absorbing complex), the second factor is connected with biological processes (25,2%), the third factor is connected with a microrelief (20,5%). All parameters are significant at P