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vol. 5, nr. 3 (2005)
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Air temperature as a factor for prediction of soil water reserves in spring
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Małgorzata Biniak, Andrzej Żyromski
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Department of Agro– and Hydrometeorology, Institute of Environmental Development and Protection, University of Agriculture, pl. Grunwaldzki 24, 50-363 Wrocław |
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vol. 5 (2005), nr. 3,
pp. 513-524
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abstract:
The paper describes possibilities of estimating soil water reserves on the basis of daily air temperatures data from the winter period, from the 1st decade of November till 3rd decade of April in the years 1963-1969 and 1976-1998. For these periods, averages, sums and the number of days with air temperature from different ranges, counted every two degrees from –26°C to 22°C were estimated. As a result, three kinds of variables were received. Dependences between air temperature values and soil water reserves for six soil layers: 0-5, 0-10, 0-20, 0-30, 0-40, 0-50 cm were determined for bare soil on the 1st of April and the 1st of May using step regression analysis. Estimated dependences were used to evaluate the possibilities of using such a meteorological element as air temperatures in three different forms separately, and then all three together, to estimate soil water reserves with an indirect method. Dependences were calculated for each analyzed soil layer and time. The value of the determination coefficient was the index used to describe the usefulness of all the forms.
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keywords:
soil water reserves, air temperature, spring forecasting
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original in:
Polish
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