| Effect of Irrigation Water Quality on Soil Hydraulic Conductivity |
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| 引用本文： | XIAO ZHEN-HUA,B. PRENDERGAST,P. RENGASAMY. Effect of Irrigation Water Quality on Soil Hydraulic Conductivity[J]. 土壤圈, 1992, 2(3): 237-244 |
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| 作者姓名： | XIAO ZHEN-HUA B. PRENDERGAST P. RENGASAMY |
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| 作者单位： | [1]InstituteofSoilScience,AcademiaSinica,P.O.Box821,Nanjing210008（China） [2]InstituteforIrrigationandSalini,AcademiaSinica,P.O.Box821,Nanjing210008（China） |
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| 摘 要： | The effect of irrigation water quality on unsaturated hydraulic conductivity (HC) of undisturbed soil in field was studied.Results show that within the operating soil suction range (0-1.6 KPa) of disc permeameters,the higher the electric conductivity (EC) of irrigation water,the higher the soil HC became.The soil HC doubled when EC increased from 0.1 to 6.0ds m^-1.High sodium-adsorption ratio(SAR) of irrigation water would have an unfavorable effect on soil HC.Soil HC decreased with the increasing of SAR,especially in the case of higher soil suction.An interaction existed between the effects of EC and SAR of irrigation water on soil HC.The HC of unsaturated soil dependent upon the macropores in surface soil decreased by one order of magnitude with 1 KPa increase of soil suction.In the study on the effect of very low soluble salt concentration (EC=0.1 ds m^-1 of irrigation water on soil HC,soil HC was found to be lowered by 30% as a consequence of blocking up of some continuous pores by the dispersed and migrated clay particles.Nonlinear successive regression analysis and significance test show that the effects of EC and SAR of irrigation water on soil HC reached the extremely significant level.
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| 关 键 词： | 土壤电导率 灌溉质量 钠吸附比率 土壤渗水性 |
Effect of Irrigation Water Quality on Soil Hydraulic Conductivity |
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| XIAO ZHEN-HUA,B. PRENDERGAST and P. RENGASAMY. Effect of Irrigation Water Quality on Soil Hydraulic Conductivity[J]. Pedosphere, 1992, 2(3): 237-244 |
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| Authors: | XIAO ZHEN-HUA B. PRENDERGAST P. RENGASAMY |
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| Affiliation: | Institute for Irrigation and Salinity Research, Tatura, Vic. 3616;Institute for Irrigation and Salinity Research, Tatura, Vic. 3616;Institute for Irrigation and Salinity Research, Tatura, Vic. 3616 |
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| Abstract: | The effect of irrigation water quality on unsaturated hydraulic conductivity (HC) of undisturbed soil in field was studied.Results show that within the operating soil suction range (0-1.6 KPa) of disc permeameters,the higher the electric conductivity (EC) of irrigation water,the higher the soil HC became.The soil HC doubled when EC increased from 0.1 to 6.0ds m^-1.High sodium-adsorption ratio(SAR) of irrigation water would have an unfavorable effect on soil HC.Soil HC decreased with the increasing of SAR,especially in the case of higher soil suction.An interaction existed between the effects of EC and SAR of irrigation water on soil HC.The HC of unsaturated soil dependent upon the macropores in surface soil decreased by one order of magnitude with 1 KPa increase of soil suction.In the study on the effect of very low soluble salt concentration (EC=0.1 ds m^-1 of irrigation water on soil HC,soil HC was found to be lowered by 30% as a consequence of blocking up of some continuous pores by the dispersed and migrated clay particles.Nonlinear successive regression analysis and significance test show that the effects of EC and SAR of irrigation water on soil HC reached the extremely significant level. |
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