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| Study on factors affecting soil cadmium bioavailability in soil in karst area |
| Received:December 12, 2019 |
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| KeyWord:Guangxi;carbonate parent soil;cadmium;bioavailability;influence factors |
| Author Name | Affiliation | | TANG Shi-qi | Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China | | YANG Zheng | Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China | | MA Hong-hong | Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China | | GUO Fei | Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China | | YANG Ke | Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China | | LIU Fei | Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China | | PENG Min | Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China | | LI Kuo | Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China | | LIU Xiu-jin | Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China |
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| Abstract: |
| Karst areas are the main soil cadmium content distribution areas in China. Explaining the mechanism of soil cadmium bioavailability in these areas is of great significance to understand the risks associated with soil cadmium of China. In this study, vertical soil profiles, rice seed, and its corresponding root-soil samples were collected in Guangxi and the effects of soil pH, organic matter, clay mineral, and carbonate on the bioavailability of cadmium in carbonate parent soil were discussed. Among them, it was determined that pH, organic matter, and clay minerals mainly affect the adsorption of cadmium. The bioavailability of cadmium is affected by pH, clay minerals, and organic matter in descending degree of strength order. The role of carbonate is mainly reflected as a buffer against soil acidification. In general, Guangxi has strong karst development and the soil is constantly forming new clay minerals that are stable under epigenetic conditions. In addition, the rich carbonate and organic matter in the soil of the karst areas are more favorable for the fixation of cadmium in the parent soil of carbonate rock; however, preventing soil acidification is the first measure to prevent and control the risk of soil cadmium pollution. |
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