Because of the high vegetation coverage rate in Bole City, Bortala Mongolian Autonomous Prefecture, Xinjiang, plants absorb selenium and increase the selenium content in the soil, which is high in selenium and belongs to selenium-enriched soil.

Selenium is a trace element beneficial to human health, and it is called "encyclopedia" because of its functions of improving human immunity, promoting blood circulation, resisting virus, resisting oxidation and delaying aging.

Therefore, the soil in Bole City, Bortala Mongolian Autonomous Prefecture, Xinjiang belongs to selenium-enriched soil, which is not only beneficial to the growth of crops, but also provides trace elements needed for human health.