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| Fractions and Bioavailability Spatial Distribution of Soil Cd Under Long-term Sewage Irrigation |
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| KeyWord:wastewater irrigation; soil Cd; chemical fraction; spatial distribution |
| Author Name | Affiliation | | CHEN Tao | College of Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | CHANG Qing-rui | College of Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | LIU Jing | College of Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China |
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| Abstract: |
| Long-term sewage irrigation would influence fractions and bioavailability of heavy metals in soils. Here Cd fractions and bioavailability spatial distribution were studied in farmland in Fenghui irrigated area of Xi′an City under long term sewage irrigation. Soil Cd existed mainly in exchangeable and carbonate fractions, accounting for 73% of total content. With increasing sewage irrigation time, soil Cd tended to transform to exchangeable and carbonate fractions. Irrigation history significantly affected exchangeable, carbonate and Fe-Mn oxides fractions. Soil bioavailable Cd and potentially available Cd contents had weaker spatial structure than unavailable Cd, implying that bioavailable Cd was more influenced by external factors. Soil Cd bioavailability reduced from the east to the west of the irrigated area. These findings would be very useful for adjusting agricultural structures and planning environmental remediation in the future. |
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