摘要
通过室内有沙层土柱入渗中钾离子运移试验,研究了有沙层土柱中钾离子随入渗水运移的过程和特性。结果表明,入渗过程中,由于沙层阻水造成钾离子在沙层以上积累,而在沙层内钾离子浓度并不增加。经平衡计算和有无沙层试验比较表明,粗沙基本不吸附钾离子,因沙层阻水而使钾离子暂时滞留在土-沙界面上,随水量增大钾离子浓度锋透过沙层。因此,干旱区农田洗盐需要一定水量并持续一定时间,方能使盐锋达到沙层以下,起到抑制盐分的作用。
Based on experiments of water infiltration into a loess column with a sand layer,the characteristics of salt movement with the infiltration water is studied.During the process,the salt is accumulated above the sand layer,but the concentration of salt is not increased.By balance analysis and comparison with the results of experiments without sand layer,salt is resorted above the layer temporarily because the layer arrests water penetrating through it,and that sand doesn't adsorb salt.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2005年第2期127-132,共6页
Journal of Northwest A&F University(Natural Science Edition)
基金
国家自然科学基金项目(59879022)
关键词
室内试验
有沙层土柱
钾离子运移
农田洗盐
experiments in lab
loess column with sand layer
characteristics of K^+ movement
salt leaching of farmland
