干旱区高盐度潜水蒸发条件下土壤积盐规律分析

发布时间：2018-04-10 03:20

本文选题：干旱区　切入点：高盐度潜水　出处：《水利学报》2016年02期

【摘要】：为分析干旱区高盐度潜水蒸发条件下土壤中盐分积累规律,利用室外土柱模拟试验开展了不同TDS(Total Dissolved Solids)(30和100 g/L)、不同包气带质地(细砂和粉质黏土)和不同潜水埋深(0.5、1.0和3.0 m)的高盐度潜水蒸发条件下分层土壤盐分的监测工作。通过对各个土柱不同深度7次取样得到的土壤平均含盐量数据分析表明:高盐度潜水蒸发条件下,潜水埋深越浅,土壤剖面上相同深度范围内的含盐量就越大;在其他条件一定时,包气带质地为粉质黏土的土壤剖面含盐量大于包气带质地为细砂的土壤剖面含盐量;由于黏性土的膜效应和土壤中积盐对土壤孔隙的填充作用,导致粉质黏土土柱上层的土壤含盐量表现为潜水TDS为30 g/L的大于潜水TDS为100 g/L的,在土柱下层的土壤含盐量表现为潜水TDS为30 g/L的小于潜水TDS为100 g/L的;由于TDS升高对毛细水的重力和土体结构的改变,随着潜水TDS的升高,粉质黏土土壤剖面上出现局部积盐深度下移的趋势。
[Abstract]:For the analysis of soil salt accumulation in arid area of high salinity groundwater evaporation conditions, using outdoor soil column experiments carried out in different TDS (Total Dissolved Solids) (30 and 100 g/L), different vadose zone texture (fine sand and silty clay) and different groundwater depth (0.5,1.0 and 3 m) monitoring work layered soil salinity in high salinity groundwater evaporation conditions. Through the various soil column in different depth of the 7 sampling of the average soil salinity data analysis showed that high salinity groundwater evaporation conditions, groundwater depth is shallow, soil salt content in the same depth range is bigger in other conditions; certainly, the vadose zone soil texture of silty clay salt content is greater than the soil texture is fine sand vadose zone salinity; filling effect on soil salt accumulation due to pore membrane effect of cohesive soil and the soil, resulting in silty clay soil column The salt content of soil layer is greater than 30 g/L TDS diving diving TDS is 100 g/L, the lower the soil column in the soil salt content is less than 30 g/L TDS diving diving TDS 100 g/L; TDS increased due to gravity and soil structure of capillary water change with the increase of diving TDS, the local salt accumulation depth downward trend appeared in the silty clay soil.

【作者单位】：新疆农业大学水利与土木工程学院;中国地质科学院水文地质环境地质研究所;中国地质大学水资源与环境学院;新疆昌吉州地质环境监测站;
【基金】：国家自然科学基金-新疆联合基金重点支持项目(U1403282);国家自然科学基金项目(51069016) 新疆自治区地方公派出国留学成组配套项目(XJDF201307) 新疆自治区水文学及水资源重点学科基金(xjswszyzdxk20101202)
【分类号】：S151.9

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