人和动物体内的硒主要来自于食物链植物。对粮食、蔬菜以及其它食物链植物施硒的众多研究发现，植物对硒的吸收存在以下特点：①不同植物吸收硒的能力不同，十字花科、百合科和豆科植物大于菊科、禾本科和伞形科；②同一植物的不同部位吸收硒的能力各异，通常含量，非食用部位大于可食用部位 Selenium in humans and animals comes mainly from food chain plants. Many studies on the selenium application to foodstuffs, vegetables and other food-chain plants found that the absorption of selenium by plants has the following characteristics: ①The ability of different plants to absorb selenium is different. Cruciferae, liliaceae and leguminous plants are more than those of Compositae, Umbelliferae; ② The same plant in different parts of the ability to absorb selenium different, usually content, non-edible parts larger than edible parts