Conditions and factors of humus formation in soils of mountain and foothill

On the basis of information on climatic factor, intensity humus formation in soil was estimated. It revealed that as transition from plain to foothills and low mountains due changes atmospheric precipitation hydrothermal regime, period biological activity (PBA) increases mountains. The balance annual radiation foothill is 47 kcal/cm2, high-mountain belt - 53 kcal/cm 2 . As mountainous part relief, an increase PBA and, accordance with this, content reserves humus, well labile humic substances composition, increase. By type light gray soils are humate-fulvate fulvate; typical, dark mountain brown soils, fulvate-humate; meadow-steppe humate. also provides energy for considered soils. correlations between indicators horizon “A” studied were calculated.