再生水灌溉对土壤连通孔隙特征及水力性质的影响

佘凌宇; 孙枭沁; 田卓; 王洪德

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (5) : 2664-2670.

土壤污染与控制

再生水灌溉对土壤连通孔隙特征及水力性质的影响

佘凌宇¹, 孙枭沁^2,3, 田卓³, 王洪德^3,4

作者信息 +

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

Author information +

文章历史 +

摘要

以宿迁市某再生水农业灌溉区域开展,选择长期地表水灌溉(S1)、再生水短期灌溉(S2)与再生水长期灌溉(S3)区域,采用塑料环刀和铁环刀取0~20cm和20~40cm的原状土,通过CT扫描和图像处理技术获取不同处理下土壤连通孔隙及其结构特征,同步测试土壤的水力性质,探究再生水灌溉对土壤孔隙结构与水力参数的影响,分析引起水力性质变化的关键孔隙参数.结果表明:短期再生水灌溉破坏孔隙结构,使得孔隙结构趋向于简单化.再生水长期灌溉后,土壤孔隙结构较短期灌溉有一定程度的改善,与长期地表水灌溉土壤相比没有显著差异.再生水灌溉对表层土壤和深层土壤孔隙结构与水力性质无显著影响.再生水灌溉显著降低土壤的导水性.与长期地表水灌溉相比,再生水短期灌溉与长期灌溉土壤的K_S分别降低20.81%与20.18%.再生水灌溉对于土壤的持水性能影响不大.再生水灌溉后孔隙结构的变化显著影响土壤的水力性质,冗余分析结果表明孔隙参数共解释了83.30%的水力性质变异,其中表面分形维数对水力性质的影响最大,孔隙形状与所有的水力参数都没有显著的关系.

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.

导出引用

佘凌宇, 孙枭沁, 田卓, 王洪德. 再生水灌溉对土壤连通孔隙特征及水力性质的影响[J]. 中国环境科学. 2025, 45(5): 2664-2670

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

中图分类号： X53 S27

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