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引用本文:钟松雄,李晓敏,李芳柏.Cadmium Isotopes Fractionation in Soil-Plant Systems: A Review[J].Acta Pedologica Sinica,2021,58(4):825-836. DOI:10.11766/trxb202006010266
ZHONG Songxiong,LI Xiaomin,LI Fangbai.Cadmium Isotopes Fractionation in Soil-Plant Systems: A Review[J].Acta Pedologica Sinica,2021,58(4):825-836. DOI:10.11766/trxb202006010266
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钟松雄1,2,3,4, 李晓敏5, 李芳柏2,4
1.中国科学院广州地球化学研究所, 广州 510640;2.广东省科学院广东省生态环境与土壤研究所广东省农业环境综合治理重点实验室, 广州 510650;3.中国科学院大学, 北京 100049;4.华南土壤污染控制与修复国家地方联合工程研究中心, 广州 510650;5.华南师范大学环境研究院, 广东省化学品污染与环境安全重点实验室, 广州 510006
关键词:  土壤  镉同位素分馏  迁移转化  植物  吸收转运
Cadmium Isotopes Fractionation in Soil-Plant Systems: A Review
ZHONG Songxiong1,2,3,4, LI Xiaomin5, LI Fangbai2,4
1.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China;3.University of Chinese Academy of Sciences, Beijing 100049, China;4.National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangzhou 510650, China;5.Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety, Environmental Research Institute, South China Normal University, Guangzhou 510006, China
Cd contamination of soils has aroused great concerns among the people the world over for its causing Cd concentration in food crops beyond the limit for food safety, thus posing a threat to human health via the food chain. Migration and transformation of cadmium in soil, uptake of cadmium by plant roots, transport and storage of cadmium in different organs of plants are critical processes of the biogeochemical cycling of cadmium in the soil-plant systems. In recent years, the technique of stable isotope fractionation has been applied to investigation of cadmium transfer and storage in soil-plant systems, providing new insights into the transformation of cadmium in different soil pools and plant compartments. In this study, a brief introduction is presented first to the fundamental principle and methodology of cadmium isotopic composition analysis. And then discussions in detail are made about directions and extents of the Cadmium isotopes fractionation in soil induced by a number of processes, such as dissolution of soil minerals, precipitation, adsorption, and chelation with organic matter, with special emphasis laid on mechanisms of the fractionation of Cd in different plant parts during the three critical processes, that is, cadmium uptake by plant roots, cadmium translocation from root to shoot and cadmium storage in grains. To the best of our acknowledge, fractionation of cadmium isotopes in soil-plant systems may be subject to impacts of a number of factors/processes, such as soil minerals, composition of organic matter, root exudates and microorganisms in the rhizosphere, type of plants, stage of plant growth, nutrient elements with antagonistic effect, and so on. However, it remains as of yet unclear as to how. In the end, based on the status quo of the research on cadmium isotopes fractionation in soil-plant systems, perspectives for future research are put forth to encourage a combined application with other techniques, such as spectroscopy-based speciation analyses, molecular biological analyses, and so on, in the hope that the future research may provide a better understanding of the mechanisms of cadmium transformation in soil-plant systems, and help develop regulation strategies and remediation technologies for safe production of crops in cadmium-contaminated soils.
Key words:  Soil  Cadmium isotope fractionation  Migration and transformation  Plant  Uptake and translocation