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Micro-spatial variation of elemental distribution in estuarine sediment and their accumulation in mangroves of Indian Sundarban

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Abstract

This work describes the micro-spatial variation of elemental distribution in estuarine sediment and bioaccumulation of those elements in different mangrove species of the Indian Sundarbans. The potential ecological risk due to such elemental load on this mangrove-dominated habitat is also discussed. The concentrations of elements in mangrove leaves and sediments were determined using energy-dispersive X-ray fluorescence spectroscopy. Sediment quality and potential ecological risks were assessed from the calculated indices. Our data reflects higher concentration of elements, e.g., Al, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, and Pb, in the sediment, as compared to that reported by earlier workers. Biological concentration factors for K, Ca, Mn, Fe, Cu, and Zn in different mangroves indicated gradual elemental bioaccumulation in leaf tissues (0.002–1.442). Significant variation was observed for elements, e.g., Ni, Mn, and Ca, in the sediments of all the sites, whereas in the plants, significant variation was found for P, S, Cl, K, Ca, Mn, Fe, Cu, and Zn. This was mostly due to the differences in uptake and accumulation potential of the plants. Various sediment quality indices suggested the surface sediments to be moderately contaminated and suffering from progressive deterioration. Cu, Cr, Zn, Mn, and Ni showed higher enrichment factors (0.658–1.469), contamination factors (1.02–2.7), and geo-accumulation index (0.043–0.846) values. The potential ecological risk index values considering Cu, Cr, Pb, and Zn were found to be within “low ecological risk” category (20.04–24.01). However, Cr and Ni in the Sundarban mangroves exceeded the effect range low and probable effect level limits. Strong correlation of Zn with Fe and K was observed, reflecting their similar transportation and accumulation process in both sediment and plant systems. The plant–sediment elemental correlation was found to be highly non-linear, suggesting role of some physiological and edaphic factors in the accumulation process. Overall, the study of micro-spatial distribution of elements can act as a useful tool for determining health of estuarine ecosystem.

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Acknowledgements

MB and PC are thankful to UGC, University of Calcutta, and the Govt. of West Bengal, India [Grant number: UGC/971/Fellow (Univ)]; SG and PC acknowledge DST, Govt. of India [Grant number SR/FT/LS-155/2011]; MB, SG, and PC acknowledge UGC-DAE, Kolkata Centre, for providing financial and infrastructural support.

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  1. Department of Environmental Science, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, West Bengal, 700019, India

    Madhurima Bakshi, S. S. Ram, Somdeep Ghosh & Punarbasu Chaudhuri

  2. UGC-DAE Consortium for Scientific Research, Kolkata Centre, Kolkata, India

    S. S. Ram, Anindita Chakraborty & M. Sudarshan

  3. Ion Beam Laboratory, Institute of Physics, Bhubaneswar, India

    S. S. Ram

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  1. Madhurima Bakshi
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Bakshi, M., Ram, S.S., Ghosh, S. et al. Micro-spatial variation of elemental distribution in estuarine sediment and their accumulation in mangroves of Indian Sundarban. Environ Monit Assess 189, 221 (2017). https://doi.org/10.1007/s10661-017-5891-9

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