摘要
基于室内均匀土柱一维垂直积水入渗试验,分析了入渗水矿化度对滨海盐渍土和棕壤入渗历时、入渗速率、累积入渗量、平均含水率增量的影响。结果表明,相对淡水入渗,咸水入渗显著增加土壤入渗能力,盐渍土和棕壤入渗能力分别在矿化度为12g/L和3g/L时最强,到达25cm湿润锋处入渗历时分别比淡水少32.5%和38.2%。同一矿化度条件下,通常盐渍土入渗能力较棕壤强;不同矿化度条件下,盐渍土入渗能力差异较小。Philip模型对短历时咸水入渗拟合精度较高,偏差在±0.19%范围内。不同矿化度水入渗,盐渍土湿润剖面平均含水率增量为38.22%～38.85%,棕壤为36.64%～37.82%。
The influences of mineralization degree on infiltration characteristics of coastal saline soil and brown soil were investigated by an indoor experiment of one-dimensional water ponding infiltration,using infiltration duration,infiltration rate,accumulative infiltration and average water content increment as indexes.Results show that compared with fresh water,saline water increased soil infiltration ability significantly.The abilities for the two soils reached the highest value as the mineralization were 12and 3g/L,respectively.As wetting front reached 25cm,infiltration duration for saline water was less than that for fresh water by 32.5%and 38.2%.Under the same mineralization degree,the infiltration ability for saline soil was usually stronger than that for the brown soil.Under the different mineralization,however,the infiltration ability for the saline soil did not show a big difference.Philip model could accurately simulate the infiltration process for the short-duration salty water and the deviation was within the range of±0.19%.With different mineralization degree levels water,the mean water content increment for the saline soil varied between 36.64% and 37.82%,while that for the brown soil ranged from 36.64%to 37.82%.
出处
《水土保持通报》
CSCD
北大核心
2013年第3期44-48,117,共6页
Bulletin of Soil and Water Conservation
基金
国家"863"计划课题"农田水肥联合调控技术与设备"(2011AA100504)
国家自然科学基金项目"曝气滴灌气水传输机制与滨海棉田土壤-植物系统响应"(41271236)
烟台市科技计划"设施农业水气耦合灌溉系统水力特征与关键设备"(2011065)
关键词
一维积水入渗
盐渍土
棕壤
咸水
入渗率
one-dimensional ponding infiltration
saline soil
brown soil
saline water
infiltration rate
