硒是人体的必需营养微量元素,环境中硒的缺乏或过剩与某些疾病的流行有密切的关系。发硒含量是人体近期对硒摄取水平的纪录,人群发硒含量的地理分异可以反映人群对硒摄取量的地理分异。因此编制我国发硒含量等级分布图,探讨发硒的地理分异及其影响因 Selenium is an essential micronutrient of the human body, and the lack or excess of selenium in the environment is closely related to the prevalence of certain diseases. Hair selenium content is the human body’s recent record of selenium levels, the selenium content of the population of the geographical differentiation can reflect the population of selenium uptake of geographical differentiation. Therefore, the preparation of our country selenium level distribution map to explore the selenium geographical differences and its causes