Volume 30, Issue 1 (spring 2026)
jwss 2026, 30(1): 133-144 |
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Vaezi A R, Akbari S, Haghshenas F. Investigating the Soil Susceptibility to Splash Erosion in Drylands in the Semi-Arid Region of Northwestern Iran. jwss 2026; 30 (1) :133-144
URL: http://jstnar.iut.ac.ir/article-1-4520-en.html
URL: http://jstnar.iut.ac.ir/article-1-4520-en.html
Department of Soil Science and Engineering, Faculty of Agriculture, University of Zanjan, Zanjan, Iran. , vaezi.alireza@gmail.com
Abstract: (90 Views)
Splash erosion is the initial stage of soil erosion by water, which can be significantly influenced by soil properties. The rate of this type of soil erosion in drylands of semi-arid regions is high due to sparse vegetation cover, particularly during the early stages of plant growth. This study was conducted to investigate the soil properties determining splash erosion in semi-arid drylands. Soil aggregates with a diameter of 6 to 8 mm were taken from the soil surface (0-30 cm depth) in thirty dryland farms at three replications. Soil aggregates were purred into splash bowls and exposed to simulated rainfalls with an intensity of 60 mm h-1 for 30 minutes. Different soil properties were determined in ninety soil samples. Based on the results, the highest splash erosion occurred in clay loam (0.0021 gm⁻²s⁻¹), while the lowest value was in loamy sand texture (0.0008 gm⁻²s⁻¹). Splash erosion was significantly affected by grain size distribution; so that positive correlations were found with silt (r= 0.43), clay (r= 0.44), and dispersible clay (r= 0.47), whereas negative correlations existed with sand (r= -0.46) and gravel (r= -0.53). Furthermore, splash erosion was considerably influenced by organic matter (r= -0.23), calcium carbonate (r= -0.22), bulk density (r= -0.60), aggregate stability (r= -0.44), and hydraulic conductivity (r= -0.44). This study revealed that the drylands with fine-textured soils and having a lower amount of organic matter as well as calcium carbonate, have a higher susceptibility to splash erosion in semi-arid regions.
Keywords: Particle size distribution, Bulk density, Fine-texture soils, Dispersible clay, Organic matter.
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