Quantitative Analysis of Soil Pores under Sewage Irrigation Using Computerized Tomography
Guo Xiaoming
Ma Teng
Chen Liuzhu
Liu Lin
Abstract：The suspension solids,salts and organic nutrients in sewage efflunts can significantly affect soil porosity condition. Based on the laboratory simulation and computed tomography,the numbers of soil pores,porosity and shape were quantitative-ly studied under the condition of irrigation with sewage.The results show that the soils irrigated with sewage effluents exhibi-ted higher total pore numbers and macropore numbers(≥1.00 mm in diameter)in the upper layer but lower total pore num-bers,macropore numbers,coarse pore numbers (0.26 -1.00 mm in diameter),total porosity,macroporosity and coarse porosity in the subsoil layer when compared with the soils irrigated with groundwater (p<0.05).Under the condition of irri-gation with suspension or with salt solution,total pore numbers,coarse pore numbers and coarse porosity increased,while macropore numbers,total porosity,macroporosity and cycle rate decreased.Under the condition of irrigation with nutrient solution,total pore numbers,macropore numbers,coarse pore numbers and coarse porosity increased,while macroporosity and cycle rate decreased.For the soil in the study fields,the effect of irrigation with suspension on the soil pores was stronger than that with salt solution.For the same irrigation with suspension or with salt solution,the effect of sewage irrigation on pores in groundwater irrigated soils was stronger than that in sewage irrigated soils.
Keywords：sewage irrigationsoil porecomputed tomographyfarmlandenvironmental geology
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1896-1903 )