磁化微咸水矿化度对土壤水盐运移的影响

发布时间：2018-03-13 05:21

本文选题：磁化微咸水　切入点：矿化度　出处：《农业机械学报》2017年07期 　论文类型：期刊论文

【摘要】：采用300 mT磁感应强度恒定磁水器对不同矿化度微咸水(0.14、2、3、4、5 g/L)进行磁化处理,并进行一维垂直土柱入渗试验,研究磁化微咸水矿化度对土壤水盐运移的影响。结果表明:微咸水磁化处理后,土壤入渗速率及湿润锋迁移速率显著降低,湿润体含水率显著提高;微咸水矿化度对磁化效果具有显著影响,磁化微咸水矿化度为3 g/L时,相同入渗时间累积入渗量和湿润锋深度相对减少量最大,湿润体含水率相对增加量最多。磁化微咸水入渗对Philip和Green-Ampt入渗公式参数有显著影响,相同矿化度的磁化微咸水土壤吸渗率S、饱和导水率K_s及湿润锋处吸力hf均小于未磁化微咸水;磁化与未磁化微咸水相对吸渗率ΔS及相对饱和导水率ΔK_s与矿化度之间均呈现较好的二次多项式关系,在矿化度为3 g/L时,相对吸渗率ΔS及相对饱和导水率ΔK_s均达到最大。磁化微咸水能够提高土壤持水能力,相同土层深度的土壤含水率显著增加;微咸水磁化处理后,脱盐率显著提高,土层深度0~20 cm磁化微咸水脱盐率均大于未磁化微咸水,矿化度为3 g/L的磁化微咸水磁化脱盐强度最大,相对脱盐效果更好。
[Abstract]:A 300mT magnetic induction constant magnetic water apparatus was used to magnetize different salinity brackish water (0.14), and the perpendicular soil column infiltration test was carried out. The effect of salinity of magnetized brackish water on the migration of soil water and salt was studied. The results showed that the infiltration rate and moisture front migration rate of the soil decreased significantly and the moisture content of the wetted body increased significantly after the magnetization of brackish water. The salinity of brackish water has a significant effect on the magnetization effect. When the salinity of brackish water is 3 g / L, the accumulative infiltration amount and the depth of wetting front are the largest at the same infiltration time. The relative increase of moisture content of wetted body is the most. The infiltration of magnetized brackish water has a significant effect on the parameters of Philip and Green-Ampt infiltration formula. The soil permeability of magnetized brackish water with the same salinity S, saturated water conductivity K / s and suction HF at the wetting front are lower than those of unmagnetized brackish water. There is a good quadratic polynomial relationship between the relative permeability 螖 S of magnetized and unmagnetized brackish water and the relative saturated water conductivity 螖 K / s and the salinity, when the salinity is 3 g / L, The relative permeability 螖 S and the relative saturated water conductivity 螖 Ks reached the maximum. Magnetized brackish water could increase the water holding capacity of the soil, and the soil moisture content of the same soil depth increased significantly, and the desalinization rate increased significantly after the treatment of brackish water. The desalination rate of magnetized brackish water with 0 ~ 20 cm depth is higher than that of unmagnetized brackish water. The magnetized brackish water with a salinity of 3 g / L has the highest desalination intensity, and the relative desalination effect is better than that of unmagnetized brackish water.
【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;中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：国家自然科学基金面上项目(5167090151) 国家重点研发计划项目(2016YFC0501405-4)
【分类号】：S156.4

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