摘要
根据现场监测资料,对辽东湾西侧绥中砂质平原土壤盐渍化特征进行了分析。监测区含水层主要是由较粗的透水性较好砂砾石等粗颗粒物质组成,由于地下水的过度开采,海水入侵严重,海水入侵带入的可溶性盐在土层中积蓄,使土层产生不同程度的盐渍化,其盐渍化最显著的地段在大渔场(SL1孔)区段,距海岸最近;受季节性降水的影响,盐渍化的类型和分布也不同,平水期主要是硫酸盐-氯化物型的轻盐渍化土,主要集中在1.5 m层位;丰水期土壤盐渍化较轻,在1.5 m处有氯化物型轻盐渍化土分布,各离子含量明显降低,HCO-3含量高,Cl-含量最低;枯水期分布层位主要在2.0 m以下,主要是硫酸盐-氯化物型和氯化物型中盐渍化土,各离子含量从表层向下部增高,阴离子HCO-3含量最高,Na+与HCO-3曲线分布较一致。
Based on the field monitoring data, characteristics of soil salinization in Suizhong sandy plain of the west of Liaodong Bay were analyzed. The bottom aquifer bed in this area was composed of coarse particulate matter whose water permeability is better like sandy gravel. Duing to excessive exploitation of umderground water, seawater intrusion was serious and the dissolved salt brought by sea water intrusion was accumulating in the soil layer, which induced different levels of soil salinization. The obvious salinization areas presented in Dayuchang（ SL1 borehole）, which was located in the nearest place off the shore ; Accounting to the seasonal rainfall, the types and distribution of salinization were also different. The moderately salinized soils were found to occupy the major proportion during median water pe- riod, distributing on the 1.5 m layer, were the main composition in the soil. During high flow period, the degree of soil salinization was lighter and the chloride type slightly salinized soils were distributing on the 1.5 m below the surface. The inclusion of ion inclined significantly. HCO3- taked the most share while C1taked the least. During low water period, the salinized soils distributed under 2 m layer. And the main inclusion were sulfate-chloride type and chloride type moderately salinized soils. The ion distribution increases from the surface to below and the HCO3- was the main composition. The distributing curve of Na ＋ and HCO3- were consistently.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2014年第4期537-542,共6页
Marine Environmental Science
基金
海洋公益性行业科研专项(201105020)"环渤海区域海水入侵
土壤盐渍化预警与防控关键技术研究示范"
关键词
滨海地区
海水入侵
土壤盐渍化
化学成份
coastal area
seawater intrusion
soil salinization
chemical composition
