Multifractal analysis of soil hydraulic properties in arid areas
N. Pahlevan A , M. R. Yazdani A C , A. A. Zolfaghari A and M. Ghodrati B
+ Author Affiliations
- Author Affiliations
A Faculty of Desert Studies, Semnan University, Semnan 35196-45399, Iran.
B Semnan Agriculture and Natural Resources Research Center, Semnan 35147-54374, Iran.
C Corresponding author. Email: m_yazdani@semnan.ac.ir
Soil Research 54(8) 914-925 https://doi.org/10.1071/SR15284
Submitted: 6 October 2015 Accepted: 22 June 2016 Published: 26 September 2016
Abstract
Physical and hydraulic properties of soil are variable at different spatial scales. This indicates the necessity of understanding spatial patterns of soil properties. Scaling analysis, such as multifractal analysis, has been used to determine the spatial variability of soil properties. There are however limited numbers of studies concerning the applications of multifractal techniques applied to characterise spatial variability of soil properties in arid lands. The objective of this study was to quantify the scaling patterns of soil properties measured across a transect and to apply multifractal analysis in arid land areas. A transect with a length of 4.80 km was selected, and soil properties were measured at 0–20 cm depth every 145 m along the transect. The soil properties analysed were: texture (sand, silt, clay), pH, electrical conductivity (EC), bulk density (BD), soil hydraulic properties (saturated hydraulic conductivity Ks and the van Genuchten soil water-retention equation’s parameters nv and αv), saturated water content (θs), and the slope of the soil water-retention curve at its inflection point (S). Results showed that the variability of pH and BD was characterised by quasi-monofractal behaviour. Results showed that soil hydraulic properties such as Ks, αn, nv, S, and θs were characterised by higher multifractal indices in the transects. EC showed the highest tendency to a multifractal type of scaling or the higher degree of multifractality.
Additional keywords: asymmetry index, box-counting method, hydraulic properties, tension infiltrometer.
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