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| Analysis of the changes in the input and output balance of heavy metals in Chinese agricultural soils |
| Received:August 30, 2022 Revised:March 13, 2023 |
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| KeyWord:agricultural soil;heavy metal;input and output;inventory method |
| Author Name | Affiliation | E-mail | | LIU Ziqing | Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China
School of Environmental Studies, China University of Geosciences, Wuhan 430078, China | | | LIU Jing | Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China | | | LIU Hanbing | Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China | | | FAN Feiyue | Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China | | | SU Chunli | School of Environmental Studies, China University of Geosciences, Wuhan 430078, China | suchunli@163.com | | SUN Zaijin | Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China | sunzaijin@tcare-mee.cn | | SHI Huading | Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China | | | LIANG Jiahui | Technical Centre for Soil, Agricultural and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China | |
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| Abstract: |
| To study the current status and analyze the changes in the input and output balance of heavy metals in Chinese agricultural soils, this study established an input and output inventory of heavy metals in Chinese agricultural soils based on published literatures and statistical data from 2015 to 2020 and compared it with that from 2006 to 2015. The results showed that, compared with 2006 to 2015, the input of atmospheric deposition to eight heavy metals（Cd, Hg, As, Pb, Cr, Cu, Zn, and Ni）in Chinese agricultural soils decreased by 15.8%- 65.4% in 2015 to 2020, input of irrigation water to Hg increased by 19.4%, 64.7%, and 6.6%, input of fertilizers to Zn increased by 5.9%, input of livestock manures to Cu, Zn, and Ni increased by 6.6%-64.7%, and input of sewage sludge to As and Cr increased by 22.8% and 3.5%, respectively. The net inputs of Cd, Hg, As, Pb, Cr, and Ni to Chinese agricultural soils decreased by 28.0%, 54.1%, 43.7%, 47.8%, 60.7%, and 48.4%, respectively. The main reasons for the decrease in heavy metal input were strict control of air pollutant emissions and wastewater discharges, optimization of fertilizer production processes and sludge purification processes, and the increase in crop yields. The net input of Cu and Zn increased by 2.4% and 7.2%, respectively, mainly due to the lack of restrictions on the content of Cu and Zn in the Feed Health Standards and the Requirements for the Limits of Toxic and Hazardous Substances in Fertilizers. The input of heavy metals to Chinese agricultural soils is generally greater than the output, and despite the accumulation of heavy metals, the accumulation is decreasing. |
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