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Land Use, Not Stream Order, Controls N₂O Concentration and Flux in the Upper Mara River Basin, Kenya

Mwanake, R. M.; Gettel, G. M.; Aho, K. S.; Namwaya, D. W.; Masese, F. O.; Butterbach-Bahl, K.; Raymond, P. A.

Abstract (englisch):
Anthropogenic activities have led to increases in nitrous oxide (N2O) emissions from river systems, but there are large uncertainties in estimates due to lack of data in tropical rivers and rapid increase in human activity. We assessed the effects of land use and river size on N2O flux and concentration in 46 stream sites in the Mara River, Kenya, during the transition from the wet (short rains) to dry season, November 2017 to January 2018. Flux estimates were similar to other studies in tropical and temperate systems, but in contrast to other studies, land use was more related to N2O concentration and flux than stream size. Agricultural stream sites had the highest fluxes (26.38 ± 5.37 N2O‐N μg·m–2·hr–1) compared to both forest and livestock sites (5.66 ± 1.38 N2O‐N μg·m–2·hr–1 and 6.95 ± 2.96 N2O‐N μg·m–2·hr–1, respectively). N2O concentrations in forest and agriculture streams were positively correlated to stream carbon dioxide (CO2‐C(aq)) but showed a negative correlation with dissolved organic carbon, and the dissolved organic carbon:dissolved inorganic nitrogen ratio. N2O concentration in the livestock sites had a negative relationship with CO2‐C(aq) and a higher number of negative fluxes. ... mehr

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DOI: 10.1029/2019JG005063
Zitationen: 10
Web of Science
Zitationen: 9
Zitationen: 12
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 0148-0227, 2156-2202, 2169-8953, 2169-8961
KITopen-ID: 1000100863
HGF-Programm 12.02.01 (POF III, LK 01) Effects of land use and climate change
Erschienen in Journal of geophysical research / Biogeosciences
Verlag John Wiley and Sons
Band 124
Heft 11
Seiten 3491-3506
Vorab online veröffentlicht am 15.09.2019
Nachgewiesen in Dimensions
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