The impact of reclaimed water irrigation on soil connected pore characteristics and hydraulic properties

SHE Ling-yu; SUN Xiao-qin; TIAN Zhuo; WANG Hong-de

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China Environmental Science ›› 2025, Vol. 45 ›› Issue (5) : 2664-2670.

Soil Pollution Control

The impact of reclaimed water irrigation on soil connected pore characteristics and hydraulic properties

SHE Ling-yu¹, SUN Xiao-qin^2,3, TIAN Zhuo³, WANG Hong-de^3,4

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Abstract

This study was conducted in an agricultural irrigation area of reclaimed water in Suqian City. In the irrigation area, regions with long-term surface water irrigation (S1), short-term reclaimed water irrigation (S2), and long-term reclaimed water irrigation (S3) were selected. Undisturbed soil samples were collected from depths of 0~20cm and 20~40cm using plastic and metal rings. CT scanning and image processing technology were used to obtain the connected pores and their structural characteristics under different treatments, while the hydraulic properties of the soils were simultaneously tested. This study aimed to investigate the impact of reclaimed water irrigation on soil pore structure and hydraulic parameters and to analyze the key pore parameters that caused changes in hydraulic properties. The results showed short-term reclaimed water irrigation disrupted the soil pore structure, lending to a simplification of the pore architecture. After long-term reclaimed water irrigation, the soil pore structure improved compared to short-term irrigation, with no significantly difference observed when compared to the soil under long-term surface water irrigation. The use of reclaimed water for irrigation had no significant impact on the pore structure and hydraulic properties of both surface and subsurface soils. Reclaimed water irrigation significantly reduced soil hydraulic conductivity. Compared to the soil under long-term surface water irrigation, the hydraulic conductivity (K_S) for short-term and long-term reclaimed water irrigated soils decreased by 20.81% and 20.18%, respectively. Reclaimed water irrigation had little effect on soil water retention capacity. The changes in pore structure after reclaimed water irrigation significantly affected the soil's hydraulic properties. Redundancy analysis showed that pore parameters explained 83.30% of the variation in hydraulic properties, with surface fractal dimension having the greatest impact on hydraulic properties. Pore shape had no significant relationship with any hydraulic parameters.

Key words

connected pores / hydraulic properties / image processing / reclaimed water / redundancy analysis

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SHE Ling-yu, SUN Xiao-qin, TIAN Zhuo, WANG Hong-de. The impact of reclaimed water irrigation on soil connected pore characteristics and hydraulic properties[J]. China Environmental Science. 2025, 45(5): 2664-2670

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