Zhang Ruiqing, Sun Zenghui, Li Gang, Wang Huanyuan, Cheng Jie, Hao Mingde
College of Resources and Environment, Northwest A&F University, Yangling, China.
Key Laboratory of Degraded and Unused Land Consolidation Engineering, The Ministry of Natural Resources, Xi'an, China.
Sci Rep. 2020 Nov 11;10(1):19497. doi: 10.1038/s41598-020-76548-7.
Water infiltration into the soil profile are related to the condition of the soil texture, soil bulk density, and water intensity, it is also affected by the physicochemical properties of the water. In this study, we tested the effect of two different chemical properties of water (groundwater for irrigation and naturally accumulated water) on water infiltration in seven different mixed soil consisting of different ratios of feldspathic sandstone and aeolian sandy soil (1:0, 5:1, 2:1, 1:1, 1:2, 1:5, 0:1) through laboratory soil column testing. Our results show that when the textures of the mixed soils are silty loam and sandy loam (ratios of feldspathic sandstone to aeolian sandy soil 1:0, 5:1, 2:1, 1:1 and 1:2), the infiltration time of the naturally accumulated water is significantly longer than the infiltration time of the groundwater for irrigation. When the mixed soil texture is loamy sand and sand (the ratio of feldspathic sandstone to sandy soil is 1:5 and 0:1), there was no significant difference in the infiltration time of the naturally accumulated water and of the groundwater for irrigation. Using water with the same chemical properties, the infiltration time in different ratios of mixed soil decreases from 1:0, 5:1, 2:1, 1:1, 1:2, 1:5, to 0:1. Using the same feldspathic sandstone to aeolian sandy soil ratio, the cumulative infiltration using naturally accumulated water is greater than that using groundwater for irrigation, and the difference in cumulative infiltration is greatest when the ratio of feldspathic sandstone to sandy soil is 2:1. The relationship between the cumulative infiltration and elapsed time is consistent with the Logarithmic model. The changes in wetting front migration distance are consistent with the changes in the cumulative infiltration. The infiltration characteristics of water in the mixed soil are affected by a combination of water chemical property and soil texture.
水分入渗到土壤剖面与土壤质地、土壤容重和水分强度状况有关，它还受水的物理化学性质影响。在本研究中，我们通过室内土柱试验，测试了两种不同化学性质的水（灌溉用地下水和天然积水）对七种不同比例的长石砂岩与风沙土混合土壤（1:0、5:1、2:1、1:1、1:2、1:5、0:1）水分入渗的影响。我们的结果表明，当混合土壤质地为粉质壤土和砂壤土时（长石砂岩与风沙土比例为1:0、5:1、2:1、1:1和1:2），天然积水的入渗时间显著长于灌溉用地下水的入渗时间。当混合土壤质地为壤质砂土和砂土时（长石砂岩与砂土比例为1:5和0:1），天然积水和灌溉用地下水的入渗时间没有显著差异。使用化学性质相同的水，不同比例混合土壤中的入渗时间从1:0、5:1、2:1、1:1、1:2、1:5到0:1逐渐减少。使用相同的长石砂岩与风沙土比例，天然积水的累积入渗量大于灌溉用地下水的累积入渗量，且当长石砂岩与砂土比例为2:1时，累积入渗量的差异最大。累积入渗量与历时之间的关系符合对数模型。湿润锋迁移距离的变化与累积入渗量的变化一致。混合土壤中水分的入渗特性受水化学性质和土壤质地组合的影响。
