黄土高原土壤中硒等元素的地球化学特征

研究了我国黄土高原景观土壤中硒等元素的地球化学特征。结果表明：硒、铅、钙等元素在不同类型土壤剖面中表现出相似的分异特征，硒主要富积于土壤表层，并与土壤有机质含量呈正相关；磷、锌、铅等元素从残积景观向推积景观迁移，并在此累积，而硒则在水成景观（泾河水体）中富积。硒在土壤中的地球化学行为受制于土壤中的有机质含量和气候条件，其含量水平与土壤类型及发育程度密切相关。

Geochemical Features of Elements of Selenium etc. in Soil of Loess Plateau

The geochemical features of elements of selenium etc. in soil of Chinese Loess Plateau landscape is studied. The results indicate that the elements of Se, Pb and Ca show similar differential law in different kinds of soil sections. Se mainly accumulates at top layer of soil, and its content is positive correlation with content of organic matter in soil. P, Zn and Pb are transference from residual landscape to accumulational landscape, and are accumulated there. But Se is accumulated in aqueous landscape (Jinghe River water body). The geochemical action of Se in soil is controlled by the content of organic matter in soil and meteorological condition, and its content is closely correlatied with soil type and soil growth degree.