高密地区灌溉水及土壤氟地球化学特征
姜冰, 刘阳, 吴振, 张德明, 孙增兵, 马健

Geochemical characteristics of fluorine in irrigation water and soils in the Gaomi area, Shandong Province, China
JIANG Bing, LIU Yang, WU Zhen, ZHANG De-Ming, SUN Zeng-Bing, MA Jian
图3 表层土壤氟地球化学等级
Fig.3 Geochemical grade map of fluorine in topsoil