Abstract
Purpose
Recently, the cadmium (Cd) accumulation in the black shale area has attracted increasing attentions, due to its extensive distribution and extremely high background values. The aim of our study is to explore the impacts of soil properties on Cd uptake by rice, and identify the key factors of Cd transfer from soil to rice in the black shale area.
Materials and methods
A total of 40 pairs of topsoil and rice samples were collected from the paddy fields in the black shale area and the control area. The relevant parameters in the soils, as well as the Cd concentrations in different rice tissues, were analyzed.
Results and discussion
The results show that 87.5% of the soil samples in the study area exceed the risk screening values of Cd, and 42% of the rice grain samples exceed the allowable limit of Cd. The key factor influencing Cd uptake by rice in this area is the soil phytoavailable Cd concentration. Compared to those in the control area, the soils in the black shale area have a much higher Cd level but a lower phytoavailability due to the higher pH, which is caused by carbonate. Even so, the level of Cd in the rice from the black shale area indicates a much higher ecological risk.
Conclusions
Soil pH and iron (Fe) are the most important variables exhibiting direct effects on Cd fractions in soils. In light of the neutral or weakly alkaline soil in the black shale area, we concluded that increasing the soil pH was not a feasible way to reduce Cd levels in the rice in this area.
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Acknowledgments
Special thanks are due to the responsible editor and two anonymous reviewers for their careful works and constructive comments. This study was financially supported by the National Natural Science Foundation of China (41867049, 41661085, 41761099, 41763004) and the Nature Sciences Foundation of Guangxi (2018GXNSFAA281263 and 2016GXNSFBA380106).
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Zhong, C., Feng, Z., Jiang, W. et al. Evaluation of geogenic cadmium bioavailability in soil-rice system with high geochemical background caused by black shales. J Soils Sediments 21, 1053–1063 (2021). https://doi.org/10.1007/s11368-020-02802-0
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DOI: https://doi.org/10.1007/s11368-020-02802-0