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| DOI：10.13522/j.cnki.ggps.20180326 |
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| The Change in Hydraulic Conductivity of Red Soil Irrigated with Treated Wastewater |
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ZHU Jinbin, WANG Hui, HU Chuanwang, LIU Chang, CHEN Xiaoyue
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1.College of Engineering, Hunan Agricultural University, Changsha 410128, China; 2.College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
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| Abstract: |
| 【Objective】 Soil hydraulic properties are affected by many physical and biological factors and this paper presents the results of a study on the change in hydraulic conductivity of red soil irrigated with reclaimed wastewater in subtropical region in southern China. 【Method】 The red soil was packed into columns, and each column was then irrigated with reclaimed wastewater (RW), and diluted reclaimed wastewater at 2∶1 ratio (RW-2), 4∶1 ratio (RW-4) and 6∶1 ratio (RW-6), respectively. The control was freshwater irrigation (CK). The infiltration rate in each soil column was determined using the Mini Disk Infiltrometer, and the soil water characteristic curve was measured using the pressure plate apparatus.【Result】Compared to CK, irrigation with reclaimed and diluted reclaimed wastewater reduced soil hydraulic conductivity (P<0.05) by 12% (RW), 17% (RW-2), 20% (RW-4), and 44% (RW-6). Compared to CK, RW and RW-2 increased capacity of the soil to hold water, while RW-4 and RW-6 reduced the ability of the soil to hold water. Analysis indicated that the hydraulic conductivity was positively correlated with the van Genuchten parameters n and the residual water content θr (P<0.01), as well as the dilution level (P<0.05).【Conclusion】Irrigation with reclaimed water reduced the hydraulic conductivity of the red soil but its effect on the ability of soil to hold water depended on the dilution level, indicating that the soil pore structure can be manipulated by changing dilution level of the reclaimed water. |
| Key words: reclaimed water; wet and dry alternate irrigation; soil; soil water characteristic curve |
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