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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5 河北省永清县艳芬家庭农场土地二维码标识及内容展示

Fig.5 Land two-dimensional code identification and content display of the Yanfen family farm in Yongqing County, Hebei Province