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| Atmospheric deposition as a dominant source of cadmium in agricultural soils of north China |
| Received:December 11, 2021 |
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| KeyWord:cadmium（Cd）;agricultural soil;source inventory;atmospheric deposition;north China |
| Author Name | Affiliation | E-mail | | LIU Jin | Institute of Atmospheric Physics, Chinese Academy of Sciences, State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Beijing 100029, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | PAN Yuepeng | Institute of Atmospheric Physics, Chinese Academy of Sciences, State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Beijing 100029, China
University of Chinese Academy of Sciences, Beijing 100049, China | panyuepeng@mail.iap.ac.cn | | SHI Huading | Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China | |
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| Abstract: |
| An inventory of Cd inputs to agricultural soils in north China during 2005-2019 is presented, which states the major sources including atmospheric deposition, sewage sludge, livestock manures, inorganic fertilizer, and irrigation water. Across the four major cropland areas in Beijing, Tianjin, Hebei, and Shandong, irrigation water was the main source of Cd accumulation during the period 2005- 2009, accounting for 63.0% of total inputs(1.56~2.63 mg · m-2 · a-1), followed by atmospheric deposition(30.9%), livestock manures (5.2%), inorganic fertilizers(0.6%), and sewage sludge(0.3%). However, a decade later, total Cd inputs to agricultural soils in the target region significantly reduced to 0.22~0.35 mg · m-2 · a-1. During 2015-2019, atmospheric deposition became an important source, responsible for an estimated 56.5% of total Cd inputs, followed by livestock manure(23.8%), irrigation water(13.7%), inorganic fertilizers (3.9%), and sewage sludge(2.1%). These findings suggested that the major source of Cd in agricultural soils shifted from irrigation water to atmospheric deposition during the past 15 years. |
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