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| Spatial variation of soil physical characteristics and calibration factor of Philip infiltration formula |
| Wu Shiliang1, Nie Weibo2, Ma Xiaoyi1 |
| 1.Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education, Northwest A&F University, Yang-ling, Shaanxi 712100, China; 2.Institute of Water Resources, Xi′an University of Technology, Xi′an, Shaanxi 710048, China |
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Abstract With a soil field infiltration test in the Yangling area as the basis, Philip′s infiltration equation was calibrated by using the calibration theory. The calibration coefficient and the spatial variability of soil physical properties were analyzed using the multifractal method, and based on the joint multifractal theory, a pedo-transfer function of calibration factors was constructed. The research has shown that the calibration results of arithmetic calibration factors are the most optimum. Calibration factors and soil physical properties within the research area possess multifractal characteristics, and on single and multiple scales, the spatial variability of calibration factors, sand content and organic matter content are relatively strong. The spatial variability of calibration factors and sand content is composed of high values in different scale intervals, and the spatial variability of coarse dust content is composed of low values in different scale intervals. On a single scale, there is relatively significant correlation between calibration factors and the content of organic matter as well as clay particles, and on a multiple scale, there is a significant correlation between calibration factors and soil bulk density, clay particle content and organic matter content. The soil transformation function of calibration factors from joint multifractal theory has relatively small calculation errors, and the pedo-transfer function from joint multifractal analysis can possesses a strong theoretical basis and value.
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Received: 14 March 2013
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