北京市房山区土壤重金属元素分布、富集特征及来源解析
韩冰, 黄勇, 李欢, 安永龙

Distributions, enrichment characteristics, and sources of heavy metals in soils in Fangshan District, Beijing
HAN Bing, HUANG Yong, LI Huan, AN Yong-Long
图11 重金属源因子占比
Fig.11 Factor contribution proportion of heavy metal elements