不同入渗水质对天津滨海吹填土淋洗脱盐的影响  

Effect of Infiltration Water Quality on the Desalting Process of Dredger Fill in the Coastal Area of Tianjin

作　　者：赖羽寒 赵秀芳[2] 傅瓦利[1] 侯颖臻 

机构地区：[1]西南大学,重庆400700 [2]天津市泰达盐碱地绿化研究中心,天津300457

出　　处：《节水灌溉》2014年第5期55-58,共4页Water Saving Irrigation

基　　金：天津市滨海新区"十大战役"重大科技支撑项目(2010-Bk140003);天津市建交委科技项目(NG-CW-QT-11-0010)

摘　　要：为研究不同矿化度入渗水质对天津滨海吹填土淋洗脱盐的影响,通过室内土柱模拟试验,分析了海水、中咸水和淡水3种水质入渗条件下天津滨海吹填土水分、盐分以及pH的变化特征。结果表明:3种不同矿化度入渗水作用下,湿润峰均与入渗时间呈显著的幂函数关系(R2>0.99),且随矿化度升高,入渗速率增大,即海水>中咸水>淡水;入渗结束后,海水、中咸水和淡水处理吹填土盐分分别为3.90、2.93、1.36dS/m,脱盐率为67.01%、75.21%、88.49%,脱盐效果显著;土壤pH均由淋洗前的7.65升为8.74、8.66和9.00,随盐分降低土壤碱化有所增强。In order to study the effect of different mineralization degree infiltration water on the desalting process of dredger fill in the coastal area of Tianjin, the changes of the soil moisture, soil salinity and pH of the dredger fill under the conditions of infiltration with seawater, medium saline water and fresh water, were analyzed through soil column leaching test in laboratory in this paper. The results showed that there was a remarkable power function relationship （R^2 〉0. 99） between wetting front distance and infiltration time under the three different salinity water conditions, and the infiltration rate increased with the increase of salinity, namely, the seawater〉 the medium saline water, the freshwater; after infiltration, the soil salinity of the three treatments with seawater, medium saline water and fresh water were 3. 90, 2.93, 1.36 dS/m, respectively; the desalting effect was significant and the desalting rate was 67. 01%, 75.21 %, 88. 49 % respectively; the pH value of the three treatments increased from 7. 65 before desalting to 8. 74, 8. 66, 9.00, respectively, this indicated that the soil alkalization increased with the decrease of salinity trend.

关 键 词：吹填土 淋洗脱盐 咸水灌溉 

分 类 号：S278[农业科学—农业水土工程]