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胡庆海, 王学求, 田密, 吴慧, 柳青青, 李俊华, 盘炜, 王丽君

Assessment of green food production areas: A case study of the Yongqing area in the Beijing-Tianjin-Hebei region

HU Qing-Hai, WANG Xue-Qiu, TIAN Mi, WU Hui, LIU Qing-Qing, LI Jun-Hua, PAN Wei, WANG Li-Jun

图4 永清县表层土壤中硒(a)、碘(b)、氟(c)、锗(d)地球化学等级

Fig.4 Geochemical class maps of selenium (a), iodine (b), fluorine (c), germanium (d) contents in surface soils in the Yongqing county