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Assessment of herbaceous community structure for identifying metal-tolerant species at different land uses in and around Varanasi city

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Abstract

Plant community structure under different land uses provides an important understanding of vegetation dynamics to safeguard future restoration programmes and balance ecosystem services. Therefore, this study was carried out to estimate the alterations in soil properties and contamination by potentially toxic metals at different land uses (industrial, brick kiln, highway, and residential areas) compared to the reference (botanical garden area) site coupled with their subsequent influence on herbaceous community structure, bioconcentration, translocation, and extraction amount of metals in different plant species. Most of the total and phytoavailable metals (Co, Cr, Cd, Cu, Ni, Pb, Mn, and Zn) were higher at the contaminated sites compared to the reference site. The number of herbaceous species was highest at the reference site and minimum at the industrial site. Dominant and tolerant species were Cyanodon dactylon, Croton bonaplandianus, Achyranthus aspera, Malvestrum coromendelianum, Dicanthium annulatum, Nicotiana hindostana, Sporobolus virginicus, and Parthenium hysterophorus, found at the industrial, brick kiln, and highway sites. Based on transfer coefficients, C. bonaplandianus, D. annulatum, and Eleusine indica were recognized as potential accumulators, whereas C. dactylon, Commelina benghalensis, A. aspera, Amaranthus sessilis, and M. coromendelianum were found as excluder species for different metals. The identified tolerant herbaceous species could be used for future phytoremediation strategies and the prevention of hazardous risks to living components of contaminated sites.

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Acknowledgements

The authors are thankful to the Head, Department of Botany, and the Co-ordinators, Institute of Eminence, CAS in Botany and ISLS, Banaras Hindu University for providing the necessary facilities for the experiment. The authors are also thankful to Dr. Bhanu Pandey, Scientist, CSIR–Central Institute of Mining and Fuel Research, Dhanbad for guiding us in CCA statistical analysis. M. Agrawal is also thankful to DST-SERB, New Delhi, for J.C. Bose Fellowship. S.B. Agrawal acknowledges CSIR, New Delhi, for the Emeritus scientist project.

Funding

Srishti Mishra is grateful to Banaras Hindu University for proving financial support as University Research Fellowship of the University Grants Commission, New Delhi, India. Madhoolika Agrawal is also thankful to DST-SERB, New Delhi, for J.C. Bose Fellowship (Sanction no. JCB/2021/000040).

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Srishti Mishra: writing original draft, methodology, conceptualization, visualization; Shashi Bhushan Agrawal: visualization, writing—review and editing; Madhoolika Agrawal: visualization, writing—review and editing and supervision. All authors read and approved the final manuscript.

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Correspondence to Madhoolika Agrawal.

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Mishra, S., Agrawal, S.B. & Agrawal, M. Assessment of herbaceous community structure for identifying metal-tolerant species at different land uses in and around Varanasi city. Environ Sci Pollut Res 31, 6960–6976 (2024). https://doi.org/10.1007/s11356-023-31529-x

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  • DOI: https://doi.org/10.1007/s11356-023-31529-x

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