包头市南郊污灌区农田表层土壤镨的平面空间分布特征

发布时间：2018-05-21 18:41

本文选题：镨 + 分布特征　；参考：《江苏农业科学》2016年04期

【摘要】：研究内蒙古包头市南郊污灌区农田表层土壤稀土镨(Pr)的分布特征,旨在为污灌区农田土壤环境质量评价及外源稀土Pr污染修复提供依据。采集包头市南郊污灌区农田表层土壤样品,测定样品中稀土Pr含量,将稀土Pr土壤背景值作为污灌区农田土壤外源稀土积累的参照基准值,分析土壤Pr二维空间分布规律。结果表明:南郊污灌区整个研究区土壤Pr含量范围7.34~12.80 mg/kg,是河套地区土壤Pr背景值8.2 mg/kg的0.90~1.56倍,整个研究区土壤Pr含量的平均值为10.12 mg/kg,是背景值的1.23倍。研究区所有取样点稀土Pr等值线分布图分析结果表明,稀土Pr在二维空间上具有明显的带状富集分布特征,表明外源稀土元素在农田表层土壤中积累富集的平面空间差异性。由结果可知,人类活动使污灌区农田土壤Pr超量积累,应该重视外源稀土Pr在污灌区农田土壤环境中的累积性变化,其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。
[Abstract]:The distribution characteristics of praseodymium (pr) in the surface soil of farmland in the southern suburb of Baotou, Inner Mongolia were studied in order to provide the basis for the evaluation of soil environmental quality and the remediation of exogenous rare earth pr pollution. The surface soil samples of farmland in the southern suburb of Baotou city were collected, and the content of rare earth pr in the samples was determined. The background value of rare earth pr soil was used as the reference value for the accumulation of exogenous rare earth elements in the farmland soil of the sewage irrigation area, and the two-dimensional spatial distribution of soil pr was analyzed. The results showed that the soil pr content in the whole study area was 7.34 ~ 12.80 mg / kg, which was 1.56 times of the soil pr background value of 8.2 mg/kg in Hetao area. The average value of soil pr content in the whole study area was 10.12 mg / kg, 1.23 times of the background value. The distribution of rare earth pr isograms at all sampling sites in the study area showed that rare earth pr had obvious zonal enrichment and distribution in two-dimensional space, indicating the plane spatial difference of the accumulation and enrichment of exogenous rare earth elements in the surface soil of farmland. The results showed that human activities caused excessive accumulation of pr in farmland soil of polluted irrigation area, and the accumulative change of exogenous rare earth pr in farmland soil environment of sewage irrigation area should be paid more attention to. It has potential ecological risk to farmland soil ecological environment in sewage irrigation area.
【作者单位】：包头师范学院资源与环境学院;包头师范学院化学学院;
【基金】：国家自然科学基金(编号:41461074)
【分类号】：S151.93

【参考文献】