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Chemical fractions of trace metals in atmospheric wet and dry deposition and contribution to rice root and foliar uptake

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Abstract

Aims

Atmospheric trace metal deposition is an important source in agricultural soils and crops, but a large knowledge gap exists between foliar and root uptake of wet/dry deposition. We aim to distinguish the contribution of dry and wet-deposited trace metals to rice plant via foliar and root uptake and to investigate their accumulations during the full growth season.

Methods

We performed an atmospheric exposure experiment using customized open top chambers (OTCs) to distinguish the impacts of wet and dry deposition contribution to foliar and root uptake and their mobility in soils. The foliar uptake and then translocation was hypothesized the major pathway of trace metal accumulation in rice grains.

Results

Foliar uptake of wet- and dry-deposited Cu, Zn, and Pb played an important role in their accumulations in rice plant, contributing to 44–47%, 23–25%, and 35–37% in rice grains, respectively. The leaf Cu, Zn, and Pb accumulated from atmospheric deposition can be transported upward to rice grains but nodes seem to restrict them downward translocation. Rice leaves cannot directly take up atmospheric As and the deposited As can only accumulate in rice through the root uptake. The trace metals showed high mobility in atmospheric deposition, which significantly increase the bioavailable trace metal fractions in surface soils and soil solutions.

Conclusions

This study provides a new insight of similar or even higher contributions of foliar uptake than root uptake of trace metals from atmospheric deposition and that reducing the accumulation of atmospheric trace metals due to deposition on leaves can effectively decrease the accumulation of trace metals in crops.

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Data will be made available on request.

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Acknowledgements

This work was financially supported by Key Scientific Research and Development Projects of Jiangxi Provence (20194ABC28010) and National Natural Science Foundation of China (42177234). We are also acknowledged Mei-Xiang Qiu, Xiao-Hui Zhang, and Man-Ju Zhu for the help in filed management in the experimental site.

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design. The writing and overall conceptualization were performed by Ruizhi Xia and Jun Zhou. Material preparation, data collection and analysis were performed by Ruizhi Xia, Yazhu Mi and Kaixin Hu. Hongbiao Cui, Hailong Liu, Jing Zhou commented on previous versions of the manuscript. All authors read and approved the final manuscript. Jun Zhou designed the study.

Corresponding author

Correspondence to Jun Zhou.

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All authors have no financial interests.

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Responsible Editor: Jian Feng Ma.

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Xia, R., Zhou, J., Mi, Y. et al. Chemical fractions of trace metals in atmospheric wet and dry deposition and contribution to rice root and foliar uptake. Plant Soil 494, 285–299 (2024). https://doi.org/10.1007/s11104-023-06274-2

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  • DOI: https://doi.org/10.1007/s11104-023-06274-2

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