Sources and preservation dynamics of organic matter in surface sediments of Narmada River, India – illustrated by amino acids. Journal of Marine Systems, 201: 103239.

dc.contributor.authorDearlyn Fernandes
dc.contributor.authorYing Wu
dc.contributor.authorPrabhaker Vasant Shirodkar
dc.contributor.authorUmesh Kumar Pradhan
dc.contributor.authorJing Zhang
dc.contributor.authorSamwel Mchele Limbu
dc.date.accessioned2021-04-18T05:38:47Z
dc.date.available2021-04-18T05:38:47Z
dc.date.issued2020-01
dc.description.abstractThe preservation process of organic matter (OM) in estuarine environments determines the recycling and sinking of nutrients. This process requires the identification of sources, degradation states and the main processes affecting OM transformations. Unfortunately, our understandingof the sources, degradation and factors affecting OM distribution in tropical rivers experiencing strong seasonality and monsoonal influence is still limited. This study examined the sources, degradation and factors affecting OM distribution along the Narmada River and its estuary during different seasons. Surface waters and sediments were analyzed seasonally for selected physico-chemical parameters and bulk compositions of sediments, together with amino acids (AA, including the bacterial biomarker, D-AA). The sources of OM were soils containing detrital terrestrial plant material, with C4 and C3 plants dominating the estuarine and riverine stations, respectively. The other sources of OM were in-situ production, together with bacteria and their remnants. Strong seasonality and monsoonal conditions control the sources and distribution of OM in the river. Higher concentrations of total hydrolysable amino acids (THAA) were observed in riverine stations, suggesting the presence of relatively fresher OM. The lower OC:SA ratios recorded in the estuarine sediments indicated a limited OM preservation in the studied river. Positive degradation index (DI) values were obtained during the pre-monsoon season, suggesting seasonal changes in OM diagenesis. Physical (strong tidal currents, rainfall, reduced water flow due to seasonal variations and shallow water depth within the estuary) and geochemical (mineral surface adsorption processes) factors control the distribution and transport of OM. Taken together, the sources, preservation and diagenesis of terrestrial OM along the Narmada River was controlled differentially by the strong seasonal variability of the region. Thus, under variable temporal conditions, tropical estuaries and rivers form important realms for examining, determining, evaluating and assessing OM in order to better interpret nutrient budgets of the seas and oceans.en_US
dc.description.sponsorshipNatural Science Foundation of China (No. 41530960). Ministry of Human Resources Development (India), Chinese Scholarship Council (P. R. China) and East China Normal Universityen_US
dc.identifier.doihttps://doi.org/10.1016/j.jmarsys.2019.103239
dc.identifier.urihttp://hdl.handle.net/20.500.11810/5607
dc.publisherElsevieren_US
dc.subjectNarmada River; Sediment; Organic matter (OM); Amino acids (AA); Surface area (SA); Degradation index (DI)en_US
dc.titleSources and preservation dynamics of organic matter in surface sediments of Narmada River, India – illustrated by amino acids. Journal of Marine Systems, 201: 103239.en_US
dc.typeJournal Article, Peer Revieweden_US
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