摘要
运用水热耦合模型(SHAW)对内蒙古河套灌区3种盐渍化土壤冻融期水热盐的动态变化进行了模拟研究。研究结果表明:重度盐渍化土壤累积蒸发量最大,主要是由于土壤中盐分含量较大,降低了土壤的冰点,延长了土壤的冻结时间,从而增大了土壤的蒸发量,导致翌年土壤水分大量损失,影响作物播种出苗和发芽。而且重度盐渍化土壤在冻结和融解过程中表层盐分聚积严重,而中度和轻度盐化土壤在冻结期和融解期盐分增加幅度略小一些;当秋浇定额大于150mm时,其中30%～50%水量储存于0～1m土层中,具有明显的储水保墒作用。秋浇定额和秋浇时间对于土壤蒸发量以及1m土层的储水量和含盐量的影响只是在冻结前影响较大。
The Simultaneous Heat and Water model(SHAW)was used to simulate the dynamic variation of water-heat-salt in the process of soil freezing-thawing for three kinds of salinized soil,with different degrees of saline,in the Inner Mongolia Hetao Irrigation District.The results show that the accumulated evaporation of serious saline soil is the largest among the three kinds of soils.It is caused by the high content of salt which can depress the ice point and prolong the period of soil freezing.Consequently,it resu...
出处
《水利学报》
EI
CSCD
北大核心
2009年第4期403-412,共10页
Journal of Hydraulic Engineering
基金
内蒙古自然科学基金重点项目(200508010303)
“十一五”国家科技支撑计划重点项目(2007BAD88B04)
关键词
河套灌区
冻融土壤
水热盐运移
秋浇
SHAW模型
Hetao Irrigation District
freezing-thawing of soil
water-heat-salt transfer
Simultaneous Heat and Water（SHAW）model
autumn irrigation
