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| Risk management of cadmium pollution at the county level based on multiple evaluation methods |
| Received:November 07, 2021 |
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| KeyWord:cadmium;county;risk assessment;cropland;soil acidification |
| Author Name | Affiliation | E-mail | | LIU Pengqi | College of Resources and Environmental Sciences/Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing 100193, China
National Academy of Agriculture Green Development, China Agricultural University, Beijing 100193, China | | | XU Donghao | National Academy of Agriculture Green Development, China Agricultural University, Beijing 100193, China | | | LI Yalin | College of Resources and Environmental Sciences/Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing 100193, China | | | CAI Zejiang | Institute of Agricultural Resources and Regional Planning, CAAS/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China
Red Soil Experimental Station of Chinese Academy of Agricultural Sciences in Hengyang/National Observation and Research Station of Farmland Ecosystem in Qiyang, Qiyang 426182, China | | | WEN Shilin | Institute of Agricultural Resources and Regional Planning, CAAS/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China
Red Soil Experimental Station of Chinese Academy of Agricultural Sciences in Hengyang/National Observation and Research Station of Farmland Ecosystem in Qiyang, Qiyang 426182, China | | | XU Minggang | Institute of Agricultural Resources and Regional Planning, CAAS/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China
Red Soil Experimental Station of Chinese Academy of Agricultural Sciences in Hengyang/National Observation and Research Station of Farmland Ecosystem in Qiyang, Qiyang 426182, China | | | ZHU Qichao | College of Resources and Environmental Sciences/Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, Beijing 100193, China
National Academy of Agriculture Green Development, China Agricultural University, Beijing 100193, China | qichaozhu@126.com |
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| Abstract: |
| To support zoning decision-making for Cd-contaminated arable land at a regional scale, this study used a typical cereal production county in the Hunan Province to evaluate the contamination risk. Paired soil-rice samples were collected using the grid method to assess the risk and spatial distribution characteristics of Cd pollution using single factor evaluation, the geo-accumulation index, and human health risk assessment. The results showed obvious differences in Cd contamination zoning among the three evaluation methods. The single factor evaluation showed that only 5.9% of the county was at risk. In contrast, the geo-accumulation index showed that 29.2% of the county was at risk, primarily in the middle and eastern areas, while the health risk assessment showed that 90.0% and 82.7% of the county was at risk to children and adults, respectively, mainly in the mid-eastern and southern parts of the county. Scenario analysis showed that acidification management was an effective measurement to reduce the risk of land with slightly to moderately contaminated acidity, with the health risk area decreasing by 22.0%~37.8%. These findings suggest that human health-oriented risk assessment should be addressed in contamination zoning and risk management schemes in acidic areas of China, and that acidification amendment is an effective measure to reduce the risk of slight to moderate Cd-contaminated land for safe utilization. |
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