粉壤土水盐运移对咸淡水交替灌溉的响应

为了分析不同间歇时间和矿化度对黄河三角洲粉壤土水分入渗特征及盐分分布的影响,进行了咸淡水交替灌溉的室内土柱试验,设置4种间歇时间(0, 30, 60, 90 min)和3种咸水矿化度(3,6,9 g/L),分析了累积入渗量、入渗历时、土壤水盐分布等参数变化.结果表明:相同入渗水量下,咸淡水交替灌溉的入渗历时随间歇时间的增加而显著增大.当咸水矿化度为3,6,9 g/L时,咸淡水交替灌溉处理的平均土壤含水率差异不具有统计学意义,但咸水矿化度为3 g/L处理的平均土壤含盐量低于咸水矿化度为6和9 g/L处理,且间歇90 min的平均土壤含盐量远低于其他处理.因此,当咸水矿化度为3 g/L,间歇时间较长的灌溉方式有利于降低土壤盐分.

Response of water-salt migration to salty and fresh water alternate irrigations in silty loam

Effects of irrigation intervals and salinity on water infiltration dynamics and salt distribution in the silty loam from the Yellow River Delta were investigated.Laboratory simulation experiments were conducted on soil columns and the cumulative infiltration,infiltration duration and water-salt distribution in the soil were monitored in twelve irrigation treatments in terms of four irrigation intervals(0,30,60 and 90 min)and three salinity levels(3,6 and 9 g/L).The results show that the duration of water infiltration becomes longer significantly with increasing irrigation interval in the same amount of infiltration.There is no statistically significant difference in the mean soil water content between the alternate irrigations with salty water in 3,6 and 9 g/L salinity respectively.However,the mean soil salt content in the irrigation treatment with 3 g/L salinity is lower than that in the irrigation treatments with 6 and 9 g/L salinity.Further,the mean soil salt content in the treatments with 90 min irrigation interval is much lower than the treatments with the other irrigation intervals.Overall,the alternate irrigation with salty water in 3 g/L salinity and a longer interval is beneficial to reducing soil salt content in the studied region.