METHODS FOR OPTIMIZING WATER AND THERMAL REGIMES OF DISTURBED SOILS UNDER CONDITIONS OF THE FAR NORTH
https://doi.org/10.26898/0370-8799-2017-5-3
Abstract
Results are given from long-term (2007–2010) studies on water and thermal regimes of disturbed soils and methods for their optimization under conditions of the Far North. It has been found that the moisture content of disturbed soils considerably depends on total precipitation during the vegetation period. Permafrost in the Far North affects the moisture regime, and largely regulates it. At low precipitation (84 mm) during the vegetation period, permafrost is a barrier for moisture to travel to the layers below, and atmospheric water is kept for a long time in the root layer providing plants with minimum moisture. At heavy precipitation (123 mm), the moisture of the root layer increases to the upper limit of the optimal reserves (0.87–0.99 MWC) despite the light granulometric composition of soils. The use of peat-mats contributes to more favorable moisture conditions for perennial grasses to emerge and grow by increasing moisture content in the 0.2 m soil layer by 10–17%. Plant cover, due to its low thermal conductivity, retards and reduces heat exchange between the soil and the atmosphere. As a result, the depths of soil thawing under plant cover decrease (44 cm) as compared to bare sites (54 cm). The establishment of sustainable phytocenoses of perennial grasses in the Far North with the purpose of reducing soil thawing is effective when using higher doses of mineral fertilizers (N90-160P90-160K90-160) just as they are or in combination with peatmats. Under conditions of the Far North, the optimal densities of plant cover are achieved at seeding rate of 120 kg/ha.
About the Author
A. V. IGLOVIKOV
Northern Trans-Ural State Agricultural University
Russian Federation
Russian Federation
Candidate of Science in Agriculture, Director of Agrotechnological Institute
7, Respubliki St, Tyumen, 625003, Russia
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Review
For citations:
IGLOVIKOV A.V. METHODS FOR OPTIMIZING WATER AND THERMAL REGIMES OF DISTURBED SOILS UNDER CONDITIONS OF THE FAR NORTH. Siberian Herald of Agricultural Science. 2017;47(5):23-32. (In Russ.) https://doi.org/10.26898/0370-8799-2017-5-3
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