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开封古城不同朝代文化层重金属积累与污染分析
陈彦芳1(), 马建华1,2(), 刘德新1, 谷蕾1
Heavy metal enrichment and pollution of historical cultural layers in Kaifeng City, Henan Province
Yanfang CHEN1(), Jianhua MA1,2(), Dexin LIU1, Lei GU1

图7. 各钻孔文化层重金属污染与人口密度的关系

Fig. 7. The linear correlation between PLIˉ and population density of cultural layers