Fractal Features of Soil Particles as an Index of Land Degradation under Different Land-Use Patterns and Slope-Aspects

Feng He, Neda Mohamadzadeh, Mostafa Sadeghnejad, Ben Ingram and Yaser Ostovari ()
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Feng He: School of Logistics and Management Engineering, Yunnan University of Finance and Economics Kunming, Kuming 650221, China
Neda Mohamadzadeh: Department of Geography and Geospatial Sciences, Kansas State University, 920 N17th Street, Manhattan, KS 66506-2904, USA
Mostafa Sadeghnejad: Department of Geography and Geospatial Sciences, Kansas State University, 920 N17th Street, Manhattan, KS 66506-2904, USA
Ben Ingram: School of Water, Energy and Environment, Cranfield University, College Rd, Cranfield MK43 0AL, UK
Yaser Ostovari: Department of Soil Science, College of Agriculture, Shiraz University, Shiraz 1352467891, Iran

Land, 2023, vol. 12, issue 3, 1-14

Abstract: This study examines the effects of land use and slope aspect on soil erodibility (K-factor) and the fractal dimension (D) of soil particle size distribution (PSD) in calcareous soils at the watershed scale in western Iran. The study analyzed 113 soil samples collected from four land uses (slope-farmland, farmland, pasture, and woodland) at a depth of 0–20 cm, measuring common soil properties such as soil texture, soil organic matter (SOM), calcium carbonate (CaCO 3 ), pH, and cation exchange capacity (CEC). The PSD of soil samples was measured using the international system of soil size fractions, and the D for PSD was calculated. The K-factor was calculated using the RUSLE model. The results showed that the K-factor was highest in slope farmlands with SOM at 1.6% and lowest in woodlands at 0.02 Mg h MJ −1 mm −1 with SOM at 3.5%. The study also found that there were significant correlations between D and clay content (r = 0.52), sand content (r = −0.29), and CEC (r = 0.36). Woodland soils had the highest SOM content, with a mean D value of 2.895, significantly higher than the mean D value of slope farmland soils, which had the lowest SOM at 1.6%. The study concludes that woodland soils retain finer particles, particularly clay, resulting in lower soil loss and land degradation compared to other land uses. Finally, the study suggests that shady slope aspects (south aspect) contain more organic matter due to less solar radiation and higher soil water content, resulting in lower soil erodibility (0.02 Mg h MJ −1 mm −1 ) and higher D values compared to other slope aspects.

Keywords: calcareous soil; DEM; fractal; inceptisols; land degradation; RUSLE; SOM (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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