The annual temperature dynamics of soil organogenic horizons of the Subpolar Urals

The aim of this work is to study the temperature regime of soil organogenic horizons located in different altitudinal zones of the Subpolar Urals.Three monitoring sites with different soil types were investigated. Measurements were conducted from 27 July 2010 to 29 June 2011 (338 days). The average, minimum and maximum temperature values, amplitude of fluctuations of air temperature and organogenic horizons in the studied soils of the Subpolar Urals, the amount of positive and negative temperatures during the period of observation were determined, the comparison of the temperature dynamics of organogenic horizons of different altitudinal belts on the slopes of different exposures was made.The changes in temperature of organogenic horizons of three soil types formed on the ridge Maldynyrd (Subpolar Urals) were analyzed. We found significant influence of factors of high-altitude zoning and exposition of the mountain slopes on different temperature dynamics of organogenic horizons. Natural differences in temperature regimes of the soils of different mountain belts were identified. It is shown that the “coldest” soil type are gleyic humus-illuvial podburs formed at the upper limit of the mountain-tundra belt. The “warmest” are iron-illuvial svetlozems formed in the mountain-forest belt under larch shrubmoss forest. In summer maximum daily amplitudes of temperature were fixed in soils of the mountain tundra belt. In winter the organogenic horizon of gleyic humus-illuvial podbur cools more due to the small thickness of the snow cover and the highest location.