Abstract: Selenium (Se) is an essential trace element for animals and human beings, and it is of great concern as both a nutrient and an environmental toxin due to a narrow range between deficient and toxic concentrations. Studies in last two decades regarding the distribution and speciation of Se in Se-rich rocks and soils, mobility and transformation of Se, bioavailability of Se and risk assessment for human, the interactions between microbial and Se, as well as Se isotope geochemistry in typical high-Se areas in China were summarized in this paper. At last, we overviewed the related progresses, and made the prospects on environmental geochemistry of Se.

Key words: selenium, environmental geochemistry, selenium speciation, selenium isotope, human health

摘要： 硒是人体和动物必需的微量元素，但其营养性的阈值范围较窄，已引起了不同领域研究者的广泛关注。综述了近20年来我国典型高硒区——湖北恩施富硒岩石与土壤中硒的分布与形态、硒的赋存状态、硒的迁移转化规律、硒的生物可利用性与人体健康风险、微生物与硒相互作用等硒的环境地球化学过程与循环规律，以及硒的同位素地球化学等方面的重要研究进展，并对硒的环境地球化学未来的研究方向进行了展望。

关键词: 硒, 环境地球化学, 硒形态, 硒同位素, 人体健康