Characteristics and environmental significance of topsoil magnetic susceptibility in cities on the eastern of Qinghai-Xizang Plateau: a case study of Haidong City

WANG Yanyu, LIU Liang, LAI Juanjuan, MA Fan, TONG Fan

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2026, Vol. 50 ›› Issue (1) : 121-132.

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南京林业大学学报（自然科学版）
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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2026, Vol. 50 ›› Issue (1) : 121-132. DOI: 10.12302/j.issn.1000-2006.202403028

Characteristics and environmental significance of topsoil magnetic susceptibility in cities on the eastern of Qinghai-Xizang Plateau: a case study of Haidong City

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Abstract

【Objective】 Magnetic susceptibility technology, known for its affordability, efficiency, and non-destructive nature, is widely used for monitoring and evaluating heavy metal pollution in urban soil. The eastern margin of the Qinghai-Xizang Plateau, with its unique plateau ecosystem and fragile environmental conditions, presents significant challenges. Understanding the distribution, sources and potential health risks of heavy metals in this region’s urban soil is crucial for protecting local residents’ health. 【Method】This study focused on Haidong, a representative city on the eastern margin of the Qinghai-Xizang Plateau. It systematically evaluated the spatial distribution and pollution characteristics of the surface soil through a combination of soil sampling and literature analysis. The analysis included the distribution of surface magnetic susceptibility in different functional areas of Haidong and the variation of magnetic susceptibility in soil profiles at a depth of 0-6 cm. Additionally, the study examined the distribution characteristics of soil magnetic susceptibility in the eastern margin of the Qinghai-Xizang Plateau and surrounding areas. 【Result】(1) The mass magnetic susceptibility of surface soil in Haidong showed significant variation (CV=0.65), decreasing with depth. The topsoil contains few superparamagnetic particles, mainly due to soil formation. (2) Pollution evaluation using magnetic susceptibility concentration factors and pollution load indices indicated that Haidong’s topsoil was either slightly polluted or non-polluted. Heavy metals such as Cr, Cu, Mn, Fe, and Ni originated primarily from soil formation, while Cd, Pb, and Zn were mainly from human activities. (3) The low frequency mass magnetic susceptility χlf semi-quantization model results were as follows: χlf < 59.7 × 10-8 m3/kg indicates clean soil; [59.7 × 10-8, 498.0 × 10-8) m3/kg indicated slight pollution; [498.0 × 10-8, 998.0 × 10-8) m3/kg indicated moderate pollution; χlf ≥ 998.0 × 10-8 m3/kg indicated severe pollution. (4) The magnetic susceptibility of the eastern Qinghai-Xizang Plateau was significantly lower than that of surrounding heavy industry cities. 【Conclusion】While the coefficients between surface magnetic susceptibility and heavy metal elements in Haidong varies, a significant correlation exists. Magnetic susceptibility serves as an effective index for rapid monitoring and evaluation of soil heavy metal pollution on the eastern margin of the Qinghai-Xizang Plateau.

Key words

magnetic susceptibility in topsoil / soil heavy metal / soil pollution assessment / eastern margin of Qinghai-Xizang Plateau / Haidong City

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WANG Yanyu , LIU Liang , LAI Juanjuan , et al . Characteristics and environmental significance of topsoil magnetic susceptibility in cities on the eastern of Qinghai-Xizang Plateau: a case study of Haidong City[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2026, 50(1): 121-132 https://doi.org/10.12302/j.issn.1000-2006.202403028

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