中国南方红壤中稀土元素分布的研究

Distribution of rare earth elements in red soils in southern China

中国南方红壤中稀土元素总量主要集中在１５０～２００μｇ／ｇ范围内，且土壤剖面层的底土层含量最高；稀土元素分布模式表明，红壤中轻稀土元素间略有分异，而轻、重稀土元素间以及重稀土元素间没有明显分异；稀土元素含量与红壤中有机质、粘粒含量及阳离子交换量间的相关性很弱。

REE contents in red soils mainly range from 150 to 200 μg/g,and concentrate in the C layer of the soil profiles. Distribution patterns of REE in red soils show that there exists slightly differentiation in LREE,but no obvious differentiati on between LREE and HREE,and in HREE can be observed. The correlation between RE E contents and soil organic matter,contents of soil clay,and ECEC is weak,but th ere exists obviously positive correlation between REE contents and contents of s oil Fe、Mn oxides,and phosphate.