Spatial variability of soil moisture in grassland
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Institute of Development and Protection of Environment, University of Agriculture, Plac Grunwaldzki 24, 50-363 Wrocław, Poland
Int. Agrophys. 2005, 19(1): 37-45
The paper evaluates spatial moisture variation in research sites in Poland - Pszczew (Wielkopolska Province), Pawłowice (Dolny Śląsk Province), and in Slovakia - Tatranska Kotlina. The sites are grassland. In each site, point-wise moisture measurements were conducted at 25 cm below the surface in seven squares of varied size. The sides of the squares (D) in each site were: 0.5, 1, 2, 4, 6, 10 and 25 m, and their location was random. Soil moisture measurements were carried out using a field moisture and salinity recorder, D-LOG/ms. Field works provided the data which was then analyzed by means of statistical procedures. They showed a linear relationship between moisture variance and the logarithm of the studied area. The analysis of classical dispersion measures and semivariograms demonstrated that moisture differentiation up to a certain point grows along with the increase in the area under study. The highest differentiation was observed in Pszczew and Tatranska Kotlina. High values of the calculated fractal dimensions point to high randomness in moisture distribution in surface soil. The work presents a tentative hypothesis on a linear relationship between moisture dispersion and dispersion of selected physical properties of soil. The hypothesis has not been verified so far.
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