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Ecosystem Catalysis: Soil Urease Activity and Grazing in the Serengeti Ecosystem

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dc.creator McNaughton, S. J.
dc.creator Zuniga, Gina
dc.creator McNaughton, M. M.
dc.creator Banyikwa, Feetham F.
dc.date 2016-09-21T12:28:40Z
dc.date 2016-09-21T12:28:40Z
dc.date 1997
dc.date.accessioned 2018-03-27T08:55:44Z
dc.date.available 2018-03-27T08:55:44Z
dc.identifier McNaughton, S.J., Zuniga, G., McNaughton, M.M. and Banyikwa, F.F., 1997. Ecosystem catalysis: soil urease activity and grazing in the Serengeti ecosystem. Oikos, pp.467-469.
dc.identifier http://hdl.handle.net/20.500.11810/3822
dc.identifier 10.2307/3546619
dc.identifier.uri http://hdl.handle.net/20.500.11810/3822
dc.description Full text can be accessed at http://www.jstor.org/stable/3546619?seq=1#page_scan_tab_contents
dc.description The activity of soil ureases was evaluated in the laboratory in soils from three locations in the Serengeti National Park, Tanzania, differing in the grazing intensities that the grasslands there support. Urease activity was assayed by the instantaneous release of NH4 as soon as soils drained to field capacity after application of an aqueous urea solution approximating N concentrations in ungulate urine. The appearance of NO3 and S04 in extracts was used as an index of biological activity and pH changes; neither responded to urea addition. Ammonium appearance in extracts of soils to which water but not urea was applied was low and identical; appearance in extracts where urea had been added was high and differed between sites, increasing with the level of grazer activity at a site. The data document ecologically meaningful levels of soil urease in Serengeti soils and a positive associa- tion of those levels with grazing intensity.
dc.language en
dc.publisher Wiley
dc.title Ecosystem Catalysis: Soil Urease Activity and Grazing in the Serengeti Ecosystem
dc.type Journal Article, Peer Reviewed


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