内蒙古通辽市科尔沁区土壤硒地球化学特征

对通辽市科尔沁区土壤与农作物中硒元素地球化学特征及影响因素的系统研究显示，研究区土壤硒含量水平普遍较低，且空间分布不均，仅局部达到足硒水平.硒元素主要富集在表层土壤中，且与有机碳、Al₂O₃、TFe₂O₃、Mn、P等呈正相关关系，表明土壤中有机碳、黏土矿物、铁锰氧化物对硒元素地球化学行为有重要影响.研究区土壤呈碱性至强碱性，富硒农作物并不严格产出在富硒土壤中.因此，开发富硒农产品要综合考虑土壤硒含量、土壤有效态硒含量、农作物硒含量、土壤理化性质及地理景观等因素.

GEOCHEMICAL CHARACTERISTICS OF SELENIUM IN THE SOIL OF HORQIN DISTRICT,INNER MONGOLIA

A systematic study on the geochemical characteristics and influencing factors of selenium (Se) in soil and crops of Horqin district, Tongliao City, shows that the Se content in the soil is generally low with uneven spatial distribution and only partially reaching the Se-sufficient level. Se is mainly concentrated in surface soil and positively correlated with organic carbon, Al₂O₃, TFe₂O₃, Mn and P, showing that the organic carbon, clay minerals and Fe-Mn oxides significantly affect the geochemical behavior of Se. The soil in the study area is alkaline to strongly alkaline. However the Se-rich crops are not strictly produced in Se-rich soil. Therefore, the development of Se-rich agricultural products should comprehensively consider such factors as Se content, available Se content in soil, Se content in crops, soil physicochemical property and geographical landscape.