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International audienceIrrigation with treated wastewater which has the characteristics ofhigher salt content, larger sodium adsorption ratio (SAR), and moreorganic matter and suspended particles can cause the deterioration ofthe soil environment. Ordinary water, treated wastewater, andsaline-sodic solutions with SAR = 3, 10 and 20(mmolc·L− 1)0.5,respectively, were used as five irrigation water types, and the changesof soil saturated hydraulic conductivity (Ks), soil pores distribution, andsoil pores single fractal dimension (Dm) were studied after simulatedirrigation for 1 and 2 years with simulated irrigation systems, whichconsisted of soil bins and simulated evaporation systems. The resultsshowed that soil Ks in the following descendingorder: CK > SAR3 > WW > SAR10 > SAR20, and the adverseeffects on soil Ks caused by suspended solidparticles and dissolved organic matter might play a more significantrole than sodium in treated wastewater. The 0-5 cm soils had a smallersingle soil pore area but larger pores quantity after simulatedirrigation, the distribution of soil pores which was irrigated withtreated wastewater had a smaller change compared with saline-sodicsolutions treatments, and it showed the soil pores structure binaryimage was an effective method to analysis soil pores distribution. SoilDmincreased after simulated irrigation, and the smallest was the soilsimulated irrigation with treated wastewater for 1 year, because theplugging and filling of suspended particles and dissolved organic matterin treated wastewater made the soil pores well distributed, but the soilDm did notincrease with increasing of SAR levels in irrigation waters. Therelative SAR levels irrigation to soils and soil Ks had a good linear correlationrelationship, while the relationship between soil Dm and the relativeSAR levels irrigation to soils was very complicated. The soil Dm which calculatedfrom soil binary images could not well reflect the hydraulicconductivity of saturated soil. Irrigation with treated wastewater had agreater effect on soil Ks than soil Dm, comparing withsaline-sodic solutions which had the similar SAR value. It was suggestedthat the future research should consider both the horizontal andvertical directions of soil Dm to well reflect the soilKs

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Impact of Simulated Irrigation with Treated Wastewater and Saline-Sodic Solutions on Soil Hydraulic Conductivity, Pores Distribution and Fractal Dimension