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Lake desiccation drives carbon and nitrogen biogeochemistry of a sub-tropical hypersaline lake

  • EFFECTS OF CHANGES IN SALINITY
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Abstract

Saline lakes across the globe have experienced severe reduction in their surface area as a result of climate change and human-induced perturbations like water diversion and extraction. The changing lake volume is predicted to have large-scale implication on the in-lake biogeochemistry. This study explores the carbon (C) and nitrogen (N) cycling in a desiccating hypersaline lake (Sambhar Lake, India) along with adjacently located brine reservoir and salt pans by measuring concentrations and stable isotopic ratios of different C and N pools during winter and monsoon. Incubation experiments to estimate the net nitrification and mineralization rates in lake sediments were also performed. The Lake witnessed a large decrease in surface area and showed a clear signature of desiccation on lake biogeochemistry. Both particulate and dissolved fractions of C and N in the lake increased as the lake desiccated from monsoon to winter. Low N isotopic composition (δ15N) of particulate organic matter during winter suggested the presence of N2 fixers in this nutrient-rich saline environment. Taken together, significant difference in C and N concentrations and isotopic compositions were observed across the lake, brine reservoir, and salt pans, suggesting considerable modulation of in-lake processes due to human interventions.

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Acknowledgments

The funding for this study was provided by the Department of Space, Government of India. We also thank Mr. Rajesh Oza of Hindustan Salt Limited for cooperation during the fieldwork and Mr. Vikas Soni (PRL, Ahmedabad) for assistance during winter sampling.

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Correspondence to Sanjeev Kumar.

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Guest editors: Erik Jeppesen, Miguel Cañedo-Argüelles, Sally Entrekin, Judit Padisák & S.S.S. Sarma / Effects of induced changes in salinity on inland and coastal water ecosystems

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Sarkar, S., Khan, M.A., Sharma, N. et al. Lake desiccation drives carbon and nitrogen biogeochemistry of a sub-tropical hypersaline lake. Hydrobiologia 850, 4557–4574 (2023). https://doi.org/10.1007/s10750-023-05193-8

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  • DOI: https://doi.org/10.1007/s10750-023-05193-8

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