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去电子处理微咸水矿化度对土壤水盐运移特征的影响
引用本文:王全九,许紫月,单鱼洋,张继红.去电子处理微咸水矿化度对土壤水盐运移特征的影响[J].农业工程学报,2018,34(4):125-132.
作者姓名:王全九  许紫月  单鱼洋  张继红
作者单位:西安理工大学西北旱区生态水利工程国家重点实验室培育基地,西安 710048,西安理工大学西北旱区生态水利工程国家重点实验室培育基地,西安 710048,西安理工大学西北旱区生态水利工程国家重点实验室培育基地,西安 710048,西安理工大学西北旱区生态水利工程国家重点实验室培育基地,西安 710048
基金项目:国家自然科学基金面上项目(5167090151)
摘    要:为探究去电子处理微咸水对土壤水盐运移的影响,该文通过室内土柱试验,分析了不同矿化度微咸水(0.14、2、3、4、5 g/L)经去电子处理后土壤水分入渗及盐分分布规律。结果表明:不同矿化度去电子微咸水土壤入渗速率及湿润锋运移速率明显大于未处理微咸水,入渗时间为200 min时,累积入渗量和湿润锋运移深度在矿化度为4 g/L时增加幅度最大。相同矿化度去电子微咸水与未处理微咸水相比,Philip入渗公式吸渗率、Green-Ampt入渗公式饱和导水率及湿润锋处吸力均显著增加。去电子微咸水能够显著提高土壤的持水效率和上层土壤盐分的淋洗效果,矿化度为4 g/L时,相对淋盐率和Na+相对淋洗率最大。该研究表明去电子化处理能够改善土壤水盐运移特性,有利于微咸水安全利用。

关 键 词:土壤水分  盐分  入渗  去电子微咸水  水盐分布
收稿时间:2017/9/15 0:00:00
修稿时间:2018/2/1 0:00:00

Effect of salinity of de-electronic brackish water on characteristics of water and salt movement in soil
Wang Quanjiu,Xu Ziyue,Shan Yuyang and Zhang Jihong.Effect of salinity of de-electronic brackish water on characteristics of water and salt movement in soil[J].Transactions of the Chinese Society of Agricultural Engineering,2018,34(4):125-132.
Authors:Wang Quanjiu  Xu Ziyue  Shan Yuyang and Zhang Jihong
Institution:State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, China;,State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, China;,State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, China; and State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, China;
Abstract:Abstract: The fresh water resource shortage severely increased in some regions, and the reasonable application of brackish water could alleviate the contradiction between water supply and demand. Hence, effective measures should be taken to regulate the condition of soil water and salt under brackish water irrigation. De-electronic water treatment technology is a new physical water treatment technology, which has received increasing attention in recent years. In order to improve the efficiency of brackish water utilization and alleviate the shortage of agricultural water supply, the de-electronic processor device was used to treat the brackish water with different salinity (0.14, 2, 3, 4 and 5 g/L), and the effect of de-electronic brackish salinity on water and salt movement in soil was revealed by a vertical infiltration experiment. The results showed that the soil infiltration rate and wetting front migration rate were significantly improved by the infiltration of de-electronic brackish water, and it would be varied under different salinity of brackish water. When the salinity of de-electronic brackish water was 3 g/L, the cumulative infiltration amount and wetting front depth reached the maximum at the end of infiltration. Compared with untreated brackish water, the de-electronic brackish water had a maximum relative cumulative infiltration amount and wetting front depth under brackish water condition of 4 g/L salinity. When the infiltration time was 200 min, the cumulative infiltration amount and wetting front depth were relatively increased by 20.5% and 23.1%, respectively, and the infiltration time was reduced by 34.4% after infiltration. The parameters of Philip and Green-Ampt formulas were significantly influenced by de-electronic brackish water. The soil treated by de-electronic brackish water had a greater value of soil sorptivity, saturated hydraulic conductivity and wetting front suction than untreated brackish water. The relationship between sorptivity and salinity of de-electronic brackish water can be described by a quadratic polynomial equation. And the effect of brackish water salinity on saturated hydraulic conductivity can be described by a quadratic polynomial equation as well. When the salinity was 3 g/L, sorptivity and saturated hydraulic conductivity reached the maximum under both conditions of de-electronic brackish water and untreated brackish water. Moreover, de-electronic brackish water could enhance soil water retention capacity and salt leaching effect. For the same soil depth, the soil moisture content increased significantly, especially in the depth range of 20-25 cm. The soil water content within the depth of 20-25 cm relatively increased by 29.5% at the salinity of 4 g/L. Saline content and Na+ content at the depth of 27 cm were obviously higher than that of untreated brackish water after infiltration. The salt and Na+ relative leaching rates were 16.5% and 19.9% respectively at 4 g/L brackish water. And it had a great desalination effect owing to the highest salt and Na+ relative leaching rates. The results of this study prove that de-electronic brackish water can improve soil water movement and enhance salt leaching effect. Meanwhile, the utilization rate of brackish water can be significantly increased. This study can provide a theoretical support for the application of de-electronic brackish water in agriculture irrigation.
Keywords:soil moisture  salinity  infiltration  de-electronic brackish water  water and salt distribution
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