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    Carbon isotopic and biochemical fingerprints of sedimentary organic matter in lower Narmada and Tapi rivers, north-west coast of India

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    Chem_Ecol_35_537a.pdf (999.7Kb)
    Date
    2019
    Author
    Pradhan, U.K.
    Wu, Y.
    Shirodkar, P.V.
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    Abstract
    Sources of organic matter (OM) in lower Narmada and Tapiriver-estuaries were examinedusing organic carbon to nitrogen ratio (Corg/N),stable carbon isotope ratio ( 13Corg) andlignin phenol biomarkers. The signature of lower Corg (av. 0.50%)and higher  13Corg (av. -20.3‰) inNarmada and,higher Corg (av. 0.85%) and lower  13Corg (av. -22.8‰)in Tapihighlight the difference in OM characteristics ofboth systems, nevertheless they flow adjacent to each other. TheOM in Tapiwas predominated by fresh plant tissues, as indicated by higher 8=1.2–3.2 mg/100mgCorg,lower Ad/Alv = 0.22-0.46 and lower LPVI = 17-23. The plant OM present in the sediments of Narmada was previously degraded and mixed with soil. The OMcontribution from algaewas restricted to estuarine stations in both the rivers, which was~50% in Narmada and ~35% in Tapi. The contribution of OM from fresh vascular plant was higher (20% to 63%) in Tapithan Narmada (2% to 35%). This study illustrated the benefits of using lignin phenols along withCorg/N and  13Corgto identify the potential OM sourcesin two large river-estuary systems of India, whichhighlighted the complex interaction of natural and anthropogenic processes acted on theterrestrial OM compositions
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    https://doi.org/10.1080/02757540.2019.1600682
    http://drs.nio.org/drs/handle/2264/8260
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