不同蓄水时间下滨海盐土盐分淋失规律研究

通过室内淋洗模拟试验,对比研究了蓄水时间对滨海盐土脱盐效果的影响.试验结果表明,蓄水时间与脱盐效果成反比,蓄水1～2 h后排水脱盐效果最好;脱盐后的土柱离子组成及含量相当,不同蓄水时间下离子迁移规律具有相似性,土壤离子按脱盐率由大到小排序,阳离子依次为Mg<'2+>、Na<'+>、Ca<'2>、K<'+>,阴离子依次为...

Salt Leaching of the Coastal Salinized Soil under Different Storage Time of Water

In order to obtain the optimal desalting way and investigate the law of soil water and salt transport on coastal salinized soil under different storage time of water,this paper studies the disalting effect on seashore saline soil by leaching simulation experiment in laboratory.The experiment results showed that there are opposite effects between the storage time of water and disalting effect,1~2 hours after the storage of water is the best time for the disalting effect is.The ion species and content are similar after disalination in different soil columns,and so is the law of the procedure of ion transport under different storage time.The order in which the cations are desalted from easy to difficult is: Mg2+>Na+>Ca2+>K+,while the anions order is: Cl->SO2-4>HCO-3.The pH in filtrate increases as the storage time of water increases,but the pH of soil hasn't changed very much and keep in the safe area of the plant.There is no significant difference between the disalting soil and primitive soil,except the SAR of the former is larger than the latter.