Multi-Index Assessment of Heavy Metal Contamination and Ecological Risks in Paddy Soils Along National Highways in Southern Henan Province, China
文献类型： 外文期刊
作者： Jin, Minghui 1 ; Tang, Mingming 1 ; Liu, Juan 1 ; Zhang, Jishi 2 ; Xiao, Rongying 1 ;
作者机构： 1.Xinyang Agr & Forestry Univ, Coll Agron, Xinyang 464000, Peoples R China
2.Henan Acad Agr Sci, Inst Plant Nutr Agr Resources & Environm Sci, Zhengzhou 450000, Peoples R China
关键词： heavy metals; national highways; paddy soils; pollution evaluation; environmental risk
期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）
ISSN：
年卷期： 2025 年 15 卷 6 期
页码：
收录情况： SCI
摘要： (1) Background: Road traffic emissions significantly influence heavy metal accumulation in roadside agricultural soils, posing risks to food safety. (2) Methods: This study investigated the concentrations of heavy metals (As, Cd, Cu, Cr, Hg, Ni, Pb, and Zn) in paddy soils at 96 soil samples along National Highways G107 and G312 in southern Henan, China, to evaluate the contamination situation and ecological risks using a multimetric approach. (3) Results: Cd, Hg, Cu, and Zn exceeded provincial background levels. Cd dominated contamination, showing heavy pollution (single factor index, Pi > 5) within 40 m of G107 and moderate/heavy levels (Pi = 2-5) along G312. The Nemerow index (PN) classified both highways as slightly polluted (PN = 0.70-0.81), with higher contamination along G107. Geoaccumulation indices identified Cd as mildly/moderately polluted within 40 m of G107 and G312 and Zn as slightly contaminated within 20-40 m of G107. Despite low total ecological risk, Cd contributed >75% to cumulative risk due to its high toxicity (Tr = 30). (4) Conclusions: Road traffic constitutes one of the contributors to heavy metal accumulation in paddy soils along national highways in southern Henan Province, while agricultural cultivation adjacent to transportation corridors poses potential food safety risks.
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