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Influence of Water Supply Irrigation on Thermophysical Properties of Permafrost Meadow-Chernozem Soil in the Lena River Valley

V.S. Makarov, D.D. Savvinov, G.N. Savvinov

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Research Institute of Applied Ecology of the North, North-Eastern Federal University named after M.K. Ammosov

e-mail: [email protected]

Received 01.08.2017

Abstract. The main agricultural products are obtained from crops grown on soils and the yield depends on supply for soils of available forms of nutrients and water and heat resources. In Yakutia forage crops play an important role in the development of livestock, of which the most adapted to the severe natural conditions of the North is oats. Oats in Central Yakutia are cultivated mainly on non-irrigated plots. That is why its yield depends on the amount of precipitation in the growing season. In our region arid years predominate mainly, when precipitation of a warm period decreases to 80 mm, sometimes even lower. In such years the yield of green mass of oats does not exceed 70 centner/ha. So to obtain sustainable yields of oats additional artificial irrigation is required. For that vegetative and water supply irrigation are applied. In this article, the results of studies of changes of thermophysical properties of cryogenic meadow-chernozem soils under the influence of autumn moisture-charging irrigation in the Kangalassky ulus are presented. It was found that under the influence of the autumn moisture charging irrigation the main changes occurred only in the soil volume heat capacity, while its thermal diffusivity fluctuated in insignificant limits.

Key words: water supply irrigation, irrigation norm, thermal conductivity and thermal diffusivity of a soil, soil moisture, permafrost soils.

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