盐池县禁牧封育区国道两侧土壤磁化率与土壤重金属含量的关系研究

Study on the Relationship between Soil Magnetic Susceptibility and Soil Heavy Metal Content on Both Sides of National Highway in Closed Pasture Area of Yanchi County

采集盐池县G20国道两侧土壤剖面土壤样品143样,测定样品的磁化率以及多种重金属元素含量。对土壤磁化率和重金属元素含量进行了特征分析。结果表明:研究区内土壤Χlf的变化范围为13~54×10^-8m^3/kg,土壤Χfd的变化范围为1.92%~13.51%,研究区内土壤样品中Mn、As、Cu和Pb元素含量平均分别为308.01mg/kg、8.15mg/kg、11.76mg/kg和15.10mg/kg。土壤低频磁化率与高频磁化率之间呈显著正相关,低频和高频磁化率均于频率磁化率呈显著负相关。土壤样品的磁化率与Mn、As、Pb和Cu含量呈现显著相关,相关系数分别为:0.599、0.338、0.521和0.222;与4种元素的污染负荷指数呈显著最正相关,相关系数为0.421。磁化率可以指示盐池县G20国道两侧土壤重金属的单一污染水平和综合污染水平,可以反映土壤污染主要来源为交通污染。

A total of 143 samples were collected from soil profiles on both sides of the G20 national road in Yanchi county and the magnetic susceptibility of the sample was determined. The characteristics of soil magnetic susceptibility and content of heavy metal elements in soil were also measured. The results show that: the variation range of soil Χlf was 13~54×10^-8 m^3/kg, and the variation range of soil Χfd was 1.92%~13.51%. The average contents of Mn, As, Cu and Pb in soil samples were 308.01 mg/kg, 8.15 mg/kg, 11.76 mg/kg and 15.10 mg/kg, respectively. Soil low frequency magnetic susceptibility and high frequency magnetic susceptibility was significantly positive correlated, and both low frequency and high frequency magnetic susceptibilit y are negatively correlated with frequency magnetic susceptibility. Magnetic susceptibility of soil samples was significantly correlated with Mn, As, Pb and Cu contents, and the correlation coefficients were 0.599, 0.338, 0.521 and 0.222, respectively . The pollution load index of the four elements showed the most significant positive correlation, and the correlation coefficient was 0.421. The magnetization rate can indicate the single pollution level and the comprehensive pollution level of heavy metals in the soil on both sides of the road in Yanchi county, which can reflect that the main source of soil pollution is traffic pollution.