吉林延边地区土壤稀土元素的活化特征及其影响因素

Activation characteristics and influence factors of REE in soil in Yanbian of Jilin

采用ICP-MS方法对吉林延边地区土壤中的15项稀土元素的全量和有效量进行分析,并研究了该地区土壤稀土元素的活化特征及土壤元素全量和土壤pH值对稀土元素活化的影响。结果表明:延边地区稀土元素总有效态含量的分布范围为18.52～118.02 mg/kg,平均含量为56.75 mg/kg,稀土有效量空间分布存在明显差异;土壤稀土元素的活化系数为0.23～0.46,环境因素对稀土元素的活化有着重要的影响;稀土元素全量与有效量之间皆呈显著正相关,相关系数为0.480～0.779,土壤中稀土元素有效含量受全量控制;部分土壤稀土元素的活化系数与土壤pH值呈显著正相关。

The total contents and available contents of 15 kinds of REE in Yanbian area were analyzed by the ICP-MS,and the activation characteristics of REE in soil and the influence of total contents with pH value in soil on the activation of REE were studied.The results showed that： the contents of available REE in Yanbian area ranged from 18.52 to 118.02 mg/kg,averaging 56.75 mg/kg.The spatial distribution of available REE had significant differentiation.The activation coefficient of REE ranged from 0.23 to 0.46,which indicated it was greatly impacted by the environmental factors.The total and available contents of REE in soil had significantly positive correlation,with its coefficient ranging from 0.480 to 0.779,and the available contents of REE were controlled by the total contents.The activation coefficient of partial REE had great positive correlation with the pH value of soil.