海湾泥 碱渣和粉煤灰混合基质在稳定入渗条件下离子及水盐动态研究  

Ions and Water-Salt Dynamic of Artificial Soil with Dredged Sediment, Caustic Sludge and Coal Ash Under Steadily Infiltrated Condition

作　　者：黄明勇[1] 张桥 王振宇[1] 伍钧[3] 张清[1] 

机构地区：[1]天津市盐碱地生态绿化工程中心,天津300457 [2]四川省气象环境评价中心,四川成都610072 [3]四川农业大学资源环境学院,四川雅安625014

出　　处：《农业环境科学学报》2008年第5期1815-1819,共5页Journal of Agro-Environment Science

基　　金：国家科技支撑项目(2007BAD67B03)

摘　　要：通过对海湾泥、碱渣和粉煤灰最佳配比组合在积水稳定入渗条件下的水盐动态、离子组成以及是否存在脱盐碱化问题进行了研究。结果表明,该配比基质水盐动态可分为表层脱盐、盐峰下移及底土脱盐阶段,各层次脱盐所需要的时间和用水量因深度不同而不同,0～40cm层次达到脱盐标准需要2～3d,而底土层则需要18d。淋洗前的全盐含量是淋洗后的63.5倍,混合基质盐分的化学类型由Na+-Cl-型转变到HCO3--Ca2+型,随着脱盐的进行,SAR变化与全盐量(TS)变化存在显著的正相关,RSC与全盐含量(TS)呈显著的负相关,当基质盐分降到0.1%以下时,SAR、RSC值降到1以下,且没有出现pH上升的现象,说明该配比没有出现碱化问题。Water-sah dynamic, ions composition and desahed alkalization of artificial soil, which was mixed with dredged sediment, caustic sludge and coal ash in optimizing proportion, were studied under steadily infiltrated condition. The results indicated that the water-sah movement of the soil included three phases, desalination phase in upper layer, salt peak downshift phase and substratum desalination phase. Time consumed and water quantity used of each layers were different with depths, it would take 2-3 days. for the total content of salt in 0-40 cm layer reaching desahing criterion, but subsoil was 18 days. The total content of salt in the soil reduced 63.5 times through washing salt, and the chemical type of the artificial soil was from Na^＋-Cl^- to HCO3^--Ca^2＋ with desalination. There were positively linear correlation between SAR value With total salt content, negatively linear correlation between RSC value and total salt content with desalination, SAR value and RSC value decreased to 1 when total salt content of the soil dropped to no more than 0.1%. The pH value did not rise, showing that the soil alkalization was not found in the course of desalination and the concentrations of ions had no harm to the growth of plant after the desalination.

关 键 词：混合基质 稳定入渗 离子组成 水盐动态 

分 类 号：X781.2[环境科学与工程—环境工程]