硒是环境中重要的生命元素。硒元素的丰缺在土壤——植物——动物和人的生态系统中,土壤是最基本的因素,土壤通过食物链影响人体的硒营养。随着环境污染和作物产量的提高,世界范围内食物链中硒的水平呈下降趋势。土壤含硒量过低可引起动物白肌病(WMD)或肌营养不良症(NMD);人体克山病、 Selenium is an important element of life in the environment. Abundance of Selenium In soil-plant-animal and human ecosystems, soil is the most fundamental factor, and soil affects the body’s selenium nutrition through the food chain. With the increase of environmental pollution and crop yields, the level of selenium in the food chain in the world has been declining. Low levels of soil selenium can cause animal white muscle disease (WMD) or muscular dystrophy (NMD); human Keshan disease,