包头市南郊污灌区农田表层土壤轻稀土平面空间分布特征  

Distribution of Farmland Surface Soil Lanthanum in Two-Dimensional Space of Sewage Irrigation Area in the Southern Suburbs of Baotou

作　　者：张庆辉[1] 刘兴旺[2] 程莉[1] 朱晋[1] 赵捷[1] 同丽嘎[1] 贺晓慧[1] 乌云塔娜[1] 

机构地区：[1]包头师范学院资源与环境学院,内蒙古包头014030 [2]包头师范学院化学学院,内蒙古包头014030

出　　处：《天津农业科学》2015年第7期39-47,共9页Tianjin Agricultural Sciences

基　　金：国家自然科学基金项目(41461074)

摘　　要：研究包头市南郊污灌区农田表层土壤轻稀土（Light rare earths,LREE）元素镧（La）、铈（Ce）、镨（Pr）、钕（Nd）、钐（Sm）和铕（Eu）分布特征,旨在为污灌区农田土壤环境质量评价及外源LREE污染修复提供依据。采集包头市南郊污灌区农田表层土样,测定样品中LREE含量,将LREE土壤背景值作为污灌区农田土壤外源LREE元素积累的参照基准值,分析土壤LREE空间分布规律。南郊污灌区整个研究区土壤LREE含量范围为131.86~241.41 mg·kg-1,是河套土壤LREE背景值129.54 mg·kg-1的1.02~1.86倍,整个研究区土壤LREE含量的平均值为182.77 mg·kg-1,是背景值的1.41倍。依据研究区所有取样点制作的LREE等值线分布图显示,人类活动使污灌区农田土壤LREE超量积累,应该重视外源LREE在污灌区农田土壤环境中的累积性变化,它对污灌区农田土壤生态环境具有不可忽视的潜在生态风险。This paper studied characteristics of Light rare earths （LREE, include La,Ce,Pr,Nd,Sm and Eu）distribution in farmland surface soil of sewage irrigation in Southern suburbs of Baotou（SSBT）, providing a scientific basis to evaluation of the soil environmental quality of sewage irrigated and repair of LREE pollution in soil. Stream farmland surface soils samples were collected in SSBT, to determine the content of LREE. Taking soil background value of the LREE as reference values for sewage irrigated farmland, spatial distribution of LREE in soil was analyzed. The results showed that the content of LREE in SSBT was 131.86-241.41 mg. kg-1, the average total content of LREE was 182.77 mg. kg-1,it was 1.41 times than background value 129.54 mg. kg-1. According to LREE contour map of all sampling points, LREE has obvious ribbon enrichment distribution in space, it indicates that there are the plane spatial variation of accumulation and enrichment of exogenous LREE in farmland surface soil. There is full enrichment LREE in the sewage irrigation area because human activities lead to excess accumulation of exogenous LREE in the farmland surface soil of sewage irrigation, external LREE has the potential ecological risk to farmland surface soil ecological environment in SSBT and this cannot be ignored.

关 键 词：轻稀土 分布特征 平面空间 农田表层土壤 污灌区 

分 类 号：S159[农业科学—土壤学]