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<p>Livestock farming is undergoing a rapid transition from traditional backyard systems to industrial intensification, yet the resulting shifts in the geochemical signatures of manure remain poorly understood, particularly for representative agricultural regions such as Z County in the Sichuan Basin of China—a typical livestock hub encompassing 204 manure samples (162 backyard vs. 42 industrial). In this study, we focus on a suite of potentially toxic elements (PTEs), including Cd, Hg, As, Pb, Cr, Cu, Zn, and Ni in 204 manure samples (162 backyard vs. 42 industrial) from a representative agricultural region in China. Our findings reveal a dramatic quantitative divergence and structural distortion in the geochemical profiles driven by intensification. Industrial manure exhibited a significant marked enrichment in Cu and Zn concentrations—4.18 and 2.22 times higher than backyard levels, respectively—while concentrations of Pb, Cr, and Ni declined, reflecting a shift from natural environmental background contamination to specialized feed-additive input. Crucially, we identified an elemental decoupling phenomenon: the strong synchronized linkage between Cu and Zn in backyard systems (<i>r</i> = 0.97) was substantially disrupted in industrial facilities (<i>r</i> = 0.75). Furthermore, Mercury (Hg) demonstrated an enhanced sensitivity to pH in intensified systems, with its correlation coefficient strengthening from − 0.10 to − 0.48. Radar fingerprinting visualized this transition as a shift from balanced circular patterns to highly asymmetric, needle-like distortions driven by anthropogenic formula control. Intensification overrides natural biogeochemical processes, making traditional monitoring inadequate. Elemental decoupling and fingerprint distortion should thus be integrated into early-warning frameworks as sensitive indicators of anthropogenic interference in agricultural ecosystems. These findings suggest that conventional risk assessment frameworks, which often assume synergistic metal behaviors, may need to be recalibrated to account for the elemental decoupling triggered by farming intensification.</p>

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Geochemical Fingerprint Distortion and Elemental Decoupling of Heavy Metals in Livestock Manure Driven by Farming Intensification

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Qiu Cheng,
  • Yi Jijun,
  • Gan Jinyu,
  • Zhang Jun,
  • Ling Chaosheng,
  • Bai Yang,
  • Du Qiuxiang,
  • Li Qianglin,
  • Wang Liting,
  • Wang Mingxi,
  • Fan Shoubo

摘要

Livestock farming is undergoing a rapid transition from traditional backyard systems to industrial intensification, yet the resulting shifts in the geochemical signatures of manure remain poorly understood, particularly for representative agricultural regions such as Z County in the Sichuan Basin of China—a typical livestock hub encompassing 204 manure samples (162 backyard vs. 42 industrial). In this study, we focus on a suite of potentially toxic elements (PTEs), including Cd, Hg, As, Pb, Cr, Cu, Zn, and Ni in 204 manure samples (162 backyard vs. 42 industrial) from a representative agricultural region in China. Our findings reveal a dramatic quantitative divergence and structural distortion in the geochemical profiles driven by intensification. Industrial manure exhibited a significant marked enrichment in Cu and Zn concentrations—4.18 and 2.22 times higher than backyard levels, respectively—while concentrations of Pb, Cr, and Ni declined, reflecting a shift from natural environmental background contamination to specialized feed-additive input. Crucially, we identified an elemental decoupling phenomenon: the strong synchronized linkage between Cu and Zn in backyard systems (r = 0.97) was substantially disrupted in industrial facilities (r = 0.75). Furthermore, Mercury (Hg) demonstrated an enhanced sensitivity to pH in intensified systems, with its correlation coefficient strengthening from − 0.10 to − 0.48. Radar fingerprinting visualized this transition as a shift from balanced circular patterns to highly asymmetric, needle-like distortions driven by anthropogenic formula control. Intensification overrides natural biogeochemical processes, making traditional monitoring inadequate. Elemental decoupling and fingerprint distortion should thus be integrated into early-warning frameworks as sensitive indicators of anthropogenic interference in agricultural ecosystems. These findings suggest that conventional risk assessment frameworks, which often assume synergistic metal behaviors, may need to be recalibrated to account for the elemental decoupling triggered by farming intensification.