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Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil
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Cadmium source identification in soils and high-risk regions predicted by geographical detector method
Yinjun Zhao1, Qiyu Deng2, Qing Lin1
1Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Ministry of Education, Nanning Normal University, Nanning, 530001, PR China; Key Laboratory of Earth Surface Process and Intelligent Simulation (Guangxi), Nanning Normal University, Nanning, 530001, PR China.
Environmental Pollution (Barking, Essex : 1987)
|April 19, 2020
Summary
Soil cadmium (Cd) enrichment in Guangxi, China, is driven by natural factors like soil type and geology in non-mining areas, and mining activities in others. This research identifies high-risk Cd zones for targeted soil management.
Area of Science:
- Environmental Science
- Geochemistry
- Soil Science
Background:
- Cadmium (Cd) soil contamination is a significant environmental issue, particularly in regions with naturally high background Cd levels.
- The precise mechanisms driving Cd enrichment in these high-background areas remain unclear, hindering effective management strategies.
- Guangxi Zhuang Autonomous Region (Guangxi), China, presents a case study due to its high background Cd and mining-related pollution.
Purpose of the Study:
- To investigate the sources of Cadmium (Cd) enrichment in Guangxi soils.
- To predict areas at high risk of Cadmium (Cd) soil pollution.
- To differentiate between natural and anthropogenic sources of Cadmium (Cd) contamination.
Main Methods:
- Utilized the geographical detector method to analyze Cadmium (Cd) distribution in Guangxi soils.
- Classified soil samples into non-mining and mining areas based on potential Cadmium (Cd) sources.
- Assessed the influence of factors such as soil type, geological age, rock type, and geomorphic type on Cadmium (Cd) content.
Main Results:
- In non-mining areas, Cadmium (Cd) enrichment was primarily attributed to soil type (q=0.34), geological age (q=0.27), rock type (q=0.26), and geomorphic type (q=0.20), linked to carbonatite weathering in karst areas.
- In mining areas, Cadmium (Cd) enrichment was mainly driven by mining activities (q=0.08) and rock type (q=0.05), specifically related to lead-zinc ore extraction.
- High-risk Cadmium (Cd) soil pollution areas are concentrated in Guangxi's karst regions and mining zones, including Hechi, Laibin, Chongzuo, and parts of Liuzhou, Baise, Nanning, and Guilin.
Conclusions:
- Widespread high Cadmium (Cd) concentrations in Guangxi soils are likely predominantly natural in origin.
- Elevated Cadmium (Cd) levels around mining sites are strongly indicative of anthropogenic sources from mining activities.
- Findings provide crucial data for targeted soil restoration and management of contaminated agricultural lands in Cadmium (Cd)-affected regions.
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