Spatial and temporal variations of organic matter in sediments of the Netravati River, India. Hydrological Processes, 33(20): 2642-2657.

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dc.contributor.authorDearlyn Fernandes
dc.contributor.authorYing Wua
dc.contributor.authorP. V. Shirodkar
dc.contributor.authorUmesh Kumar Pradhan
dc.contributor.authorZhuo-Yi Zhu
dc.contributor.authorJing Zhang
dc.contributor.authorSamwel Mchele Limbu
dc.date.accessioned2021-04-17T19:13:49Z
dc.date.available2021-04-17T19:13:49Z
dc.date.issued2019-05-29
dc.description.abstractOrganic matter (OM) such as organic nitrogen plays a substantial role in the global biogeochemical cycling of bio‐reactive components—amino acids (AA) in aquatic environments. Spatial and temporal variations in source, diagenesis, and fate of organic nitrogen such as AA in sediments of small tropical rivers and the role of oxbow/meandering loops under changing climatic conditions are poorly investigated. This study assessed the spatial and seasonal variations in OM composition, source, and diagenesis of a tropical small mountainous river—Netravati River, India, for 1 year. Water samples were determined for suspended particulate matter, and surface sediments were examined for bulk parameters, surface area (SA), and the L‐ and D‐enantiomers of AA. The L‐ and D‐enantiomers of AA displayed subtle seasonal variations in composition and depicted varying degrees of diagenesis. The concentration of D‐enantiomer of AA was high and showed substantial contributions from bacteria, terrestrial source, and in situ production. The D‐arginine was the most abundant D‐enantiomer of AA in the study area, possibly due to extracellular secretion by bacterial species and adsorption onto sediments, and thus, it was protected from degradation. Degradation index was more negative at the oxbow and meandering loop stations during the dry season suggesting that local geomorphologic settings steer the diagenesis of OM within the river. A negative relationship between gamma‐aminobutyric acid and organic carbon:surface area (OC:SA) ratio and a positive correlation between tyrosine and OC:SA ratio suggested accelerated loss of OM. Furthermore, the concentrations of most bulk parameters were higher in the lower reaches during monsoon and premonsoon seasons. Taken together, changes in seasons have an operational control in distinguishing the composition, source, and diagenesis of spatial OM distribution. Moreover, oxbows and river meandering loops influence the diagenetic processes in small tropical river systems.en_US
dc.description.sponsorshipMinistry of Human Resources Development (India); Natural Science Foundation of China, Grant/Award Numbers: 41530960, 41276081,111 project (B08022); Chinese Scholarship Council (P.R. China)en_US
dc.identifier.citation7.1.20 Dearlyn Fernandes, Ying Wua, P. V. Shirodkar, Umesh Kumar Pradhan, Zhuo-Yi Zhu, Jing Zhang and Samwel Mchele Limbu (2019). Spatial and temporal variations of organic matter in sediments of the Netravati River, India. Hydrological Processes, 33(20): 2642-2657. https://doi.org/10.1002/hyp.13516en_US
dc.identifier.doihttps://doi.org/10.1002/hyp.13516
dc.identifier.urihttp://hdl.handle.net/20.500.11810/5601
dc.publisherWileyen_US
dc.subjectamino acids; meandering loops; Netravati River; organic matter (OM); surface area (SA)en_US
dc.titleSpatial and temporal variations of organic matter in sediments of the Netravati River, India. Hydrological Processes, 33(20): 2642-2657.en_US
dc.typeJournal Article, Peer Revieweden_US
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