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Intercropping of kenaf and soybean affects plant growth, antioxidant capacity, and uptake of cadmium and lead in contaminated mining soil

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Abstract

Intercropping is considered a sustainable agricultural practice that can reduce the environmental impacts on agriculture. Our study investigated the morphology, physiology, and cadmium (Cd) and lead (Pb) uptake of kenaf (Hibiscus cannabinus L.) and soybean (Glycine max L.) under intercropping in mining soil. Results showed that mutual intercropping is conducive to the growth and biomass accumulation of kenaf and soybean, compared to their respective monoculture. Intercropping increased the relative chlorophyll index in kenaf, while that in soybean had no significant effect. Furthermore, intercropping increased the antioxidant enzyme activity of kenaf, while that of soybean reduced or had no significant effect. The content of malondialdehyde (MDA) was decreased in both of the species. Compared to their respective monoculture, Cd content was increased in kenaf leaves and reduced in soybean roots. Moreover, intercropping decreased the Pb content in tissues of both the species, except that Pb content of kenaf roots was increased. At the same time, root, leaf, or stem bioconcentration factors also performed the same trend, and TF was less than 1. These results indicated that intercropping can increase the plant growth and decrease the metal content in plant tissues. Present findings could provide support for future research on kenaf and soybean cultivation in contaminated lands. In addition, the present study strengthens our understanding about the effectiveness of intercropping system on heavy metal–contaminated lands for sustainable agricultural production.

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Funding

This study was supported by a grant from “The National Natural Science Foundation of China” (31960368).

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  1. Guangxi Key Laboratory of Agro-Environment and Agric-Products Safety, Key Laboratory of Plant Genetics and Breeding, College of Agriculture, Guangxi University, Nanning, 530004, China

    Muzammal Rehman, Jiao Pan, Samavia Mubeen, Wenyue Ma, Dengjie Luo, Shan Cao & Peng Chen

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  1. Muzammal Rehman
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  2. Jiao Pan
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  3. Samavia Mubeen
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  7. Peng Chen
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The experiment was designed by Peng Chen. Material preparation was done by Muzammal Rehman, Jiao Pan, and Wenyue Ma. Data collection, data analysis, and write up of the first draft of the manuscript were done by Muzammal Rehman. Manuscript was revised by Peng Chen, Samavia Mubeen, Dengjie Luo, and Shan Cao. All authors read and approved the final manuscript.

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Rehman, M., Pan, J., Mubeen, S. et al. Intercropping of kenaf and soybean affects plant growth, antioxidant capacity, and uptake of cadmium and lead in contaminated mining soil. Environ Sci Pollut Res 30, 89638–89650 (2023). https://doi.org/10.1007/s11356-023-28757-6

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