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Influence of land use change on nitrate sources and pollutant enrichment in surface and groundwater of a growing urban area in Tanzania

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Abstract

In the present study, 3-year (1997, 2008 and 2017) satellite images as well as different hydro-chemical parameters, nitrogen and oxygen isotopic composition of nitrate were used to examine the impacts of land use and land cover change on surface and groundwater quality. Through isotopic composition, sources of surface and groundwater pollutants were also elucidated. The results showed significant land use transition whereby land use changed from forest and bare land to agricultural land and built-up areas. A slight reduction in the size of areas covered by water bodies was also observed. Results indicate differences in nitrate concentration that mirror land use changes. Samples with elevated levels of nitrate above 10 mg/L were located near agricultural fields and areas with intensive livestock keeping activities. In groundwater, ẟ15N-nitrate and ẟ18O-nitrate ranged from 3.2‰ to 20.1‰ with a mean value of 11.7 ± 1.8‰ and from 2.1‰ to 12.0‰ with mean value of 5.4 ± 1.8‰, respectively. In surface water, ẟ15N-nitrate and ẟ18O-nitrate ranged from 2.4‰ to 19.3‰ with mean value of 4.9 ± 1.4‰ and from 1.5‰ to 21.9‰ with a mean value of 13.5 ± 2.8‰, respectively. Isotopic composition data suggest sources of nitrate in both ground and surface water dominated by synthetic and organic fertilizer application and to a lesser extent a natural soil nitrate source.

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Acknowledgements

Professor Alfred N. N. Muzuka, who died during the course of this work—Alfred, you will always be remembered for your diligence and adherence to standards. We also thank the African Development Bank (AfDB) for a support given to the Nelson Mandela African Institution of Science and Technology (NM-AIST) from which this research benefited.

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  1. School of Materials, Energy, Water and Environmental Sciences (MEWES), The Nelson Mandela African Institution of Science and Technology (NM AIST), P. O. Box 447, Arusha, Tanzania

    Clarah L. Mallya & Mwemezi J. Rwiza

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  1. Clarah L. Mallya
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  2. Mwemezi J. Rwiza
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Correspondence to Mwemezi J. Rwiza.

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Mallya, C.L., Rwiza, M.J. Influence of land use change on nitrate sources and pollutant enrichment in surface and groundwater of a growing urban area in Tanzania. Environ Earth Sci 80, 111 (2021). https://doi.org/10.1007/s12665-021-09386-z

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