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研究土壤初始含盐量对入渗特性的影响,对盐碱地治理具有重要意义。在室内分别进行初始氯化钠含量为3.6、4.5、5.3、5.7 g·kg-1和9.0 g·kg-1的一维垂直土柱淋洗试验。根据试验数据,采用多元回归法,建立了湿润锋、累积入渗量与时间和土壤含盐量之间的量化关系,回归相关系数分别为0.992、0.922,回归模型拟合程度较好;根据累积入渗量得到了入渗率与时间和土壤含盐量之间的量化关系。实验和分析计算表明:土壤初始含盐量对入渗特性的影响大于时间对入渗特性的影响,相同时间土壤初始含盐量越高,入渗湿润锋、累积入渗量和入渗率值越小。
Studying the effect of initial soil salt content on infiltration characteristics is of great significance to the management of saline-alkali land. One-dimensional vertical soil column leaching experiments with initial sodium chloride contents of 3.6, 4.5, 5.3, 5.7 g · kg-1 and 9.0 g · kg-1 were conducted indoors. According to the test data, the multiple regression method was used to establish the quantitative relationship between wetting front, cumulative infiltration rate and soil salinity. The regression coefficients were 0.992 and 0.922, respectively. The regression model fitted well. According to the cumulative The infiltration rate obtained the quantitative relationship between infiltration rate and time and soil salinity. The experimental and analytical calculations show that the effect of initial soil salinity on infiltration characteristics is greater than that of infiltration characteristics at the same time. The initial salinity of soil is higher at the same time. The infiltration wetting front, cumulative infiltration and infiltration rate The smaller.