期刊
ENVIRONMENTAL POLLUTION
卷 280, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.116965
关键词
Cadmium; Paddy field; Transport mechanism; Rice cultivation dominated regions
资金
- Natural Resources Science and Technology Program of Jiangsu Province [2020006, 2020001]
- National Natural Science Foundation of China [41771243]
- National Key Researches and Development Program of China [2017YFD0800305]
- Open Fund of the Key Laboratory of Coastal Zone Exploitation and Protection, Ministry of Natural Resources [2019CZEPK01]
- Program A for Outstanding Ph.D. Candidate of Nanjing University (NBS) [202002A022]
This study provides an overview of Cd pollution levels in paddy soils and rice grains in China, highlighting the need for more attention in the Yangtze River basin, especially in Hunan. The review also summarizes the sources, transport mechanisms, and influencing factors of Cd in soil-rice ecosystems, offering potential methods to control Cd accumulation.
Cd accumulation in paddy soils and its subsequent transfer to the food chain are widespread environ-mental issues, which has been extensively investigated in China. However, most studies focused on regional scales and these results may not be applicable to present the Cd contamination status in soil-rice ecosystems at a national scale. Therefore, based on collected data from China's rice cultivation dominated regions, this study provides the Cd pollution level of paddy soils and rice grains in China. Results in-dicates that the Yangtze River basin, especially Hunan, required more attention due to the elevated Cd concentrations in soil-rice ecosystems. Moreover, this review summarizes the significant natural and anthropogenic sources, transport and accumulation mechanism as well as the influencing factors of Cd in soil-rice ecosystems. The wide occurrence of Cd contamination in paddy soils derived primarily from mining activities, intensive application of phosphates fertilizers and e-waste. Physicochemical charac-teristics of soil, soil microorganisms, temperature as well as the physiological features of rice plants all contribute to Cd accumulation in rice grains, which can be controlled to mitigate Cd accumulation in rice grains. This review will provide a scientific reference for Cd pollution control and management with respect to paddy field ecosystems in China and other countries. (c) 2021 Elsevier Ltd. All rights reserved.
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