Any of the six chemical elements in group 2 of the periodic table, including [[铍|鈹|pi2]], [[镁|鎂|mei3]], [[钙|鈣|gai4]], [[锶|鍶|si1]], [[钡|鋇|bei4]], and [[镭|鐳|lei2]]

General term for soil with high levels of salt or alkaline content; includes saline soil, alkaline soil, and various types of salinized or alkalized soils