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Updated: Jul 9, 2025

Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil
Published on: September 1, 2020
Unveiling the spatial differentiation drivers of major soil element behavior along traffic network accessibility
Siyu Wang1, Zhunan Xiong1, Xiaoxiao Han1
1Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China.
Transportation accessibility significantly impacts soil metal pollution in urban areas. Higher accessibility correlates with increased toxic elements like Cadmium (Cd) and Mercury (Hg), driven by urbanization and industrial activity.
Area of Science:
- Environmental Science
- Urban Ecology
- Geochemistry
Background:
- Urbanization alters land use and accelerates socio-economic flows, challenging traditional urbanization gradients.
- Transportation network accessibility is a key indicator of urban development and influences environmental conditions.
- Growing concerns exist globally and in China regarding metal pollution in urban soils.
Purpose of the Study:
- To investigate the drivers of toxic and trace metal elements in surface soil.
- To analyze the influence of urbanization, soil properties, and topography on metal distribution.
- To assess how varying transportation accessibility levels affect soil metal concentrations in the Beijing-Tianjin-Hebei urban agglomeration.
Main Methods:
- Utilized geographic detector analysis to identify driving forces.
- Employed single-factor pollution index and Moran's Index for pollution assessment and spatial analysis.
- Collected and analyzed surface soil samples (0-20 cm) for heavy metal and trace element concentrations.
Main Results:
- Accessibility significantly influences Cadmium (Cd) and Mercury (Hg) levels, with higher concentrations in more accessible areas.
- Cadmium (Cd) and Vanadium (V) exhibited the highest pollution exceedance rates (93.18% and 75.76%).
- Spatial clustering of elements was observed, with hotspots in high-accessibility zones, indicating urbanization's role in agglomeration patterns.
Conclusions:
- Urbanization intensifies soil pollution by toxic elements, particularly in areas with high transportation accessibility.
- Trace elements (Mn, Ti, V) are increasingly influenced by urbanization, alongside natural processes.
- Findings highlight the need for targeted environmental management strategies in rapidly urbanizing regions.
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