不同矿化度水淋洗重度盐碱土的水盐运移特征

Water and Salt Transporting Feature of Soil with Different Degree Mineralization of Water Leaching Severe Saline-alkali Soil

通过室内土柱试验探讨了不同矿化度水淋洗重度盐碱土的水盐运移特征。结果表明,微咸水和咸水的入渗速率要明显高于淡水入渗。在灌水淋洗后土壤盐分含量均大幅下降,以淡水和微咸水的脱盐效果较好。3个处理淋洗后土壤的Na+、Cl-、SO42-、K+、Mg2+、Ca2+含量下降,CO32-、HCO3-含量有所上升,土壤pH值上升,淡水淋洗土壤pH值上升幅度较大。因此,微咸水淋洗重度盐碱土在3种矿化度水中的综合淋洗效果最好,用微咸水代替淡水淋盐改良,将会有不错的效果。

An indoor soil column experiment was carried out to investigate the water and salt transporting characteristics of severe saline-alkali soil,which was leached with different salinity of water.The results indicated that the soil infiltration rate of mincro-saline and saline water was obviously higher than that of fresh water.The soil salinity desended significantly after irrigation and the soil desalinization effect by leaching with fresh and mincro-saline water was better.After irrigation,soil pH and the concentrations of CO3^2- and HCO-3 increased in the three treatments soil,while the concentrations of Na^＋,Cl^-,SO4^2-,K^＋,Mg^2＋ and Ca^2＋ decreased,soil pH of leached with fresh water increased greatly.Among the three degree mineralization of water,the mincro-saline water has the best comprehensive effect of leaching severe saline-alkali soil.Therefore,replacements of fresh water with mincro-saline water shoud have better leaching effects.