Show simple item record O'Halloran, L. Shugart, H. Wang, L. Caylor, K. Ringrose, S. Kgope, B. 2011-05-19T13:54:15Z 2011-05-19T13:54:15Z 2010-02-19
dc.identifier.citation O'Halloran, L. et al (2010) Nutrient limitations on aboveground grass production in four savanna types along the Kalahari Transect, Journal of Arid Environments, Vol. 74, pp. 284-290 en_US
dc.identifier.other 10.1016/j.jaridenv.2009.08.012
dc.description.abstract The Kalahari Transect (KT) is an International Geosphere–Biosphere Programme mega-transect designed to examine hydrological and ecological patterns and processes throughout the savannas of southern Africa. The KT traverses a precipitation gradient ranging from w920 mm rain/year in the north to w260 mm rain/year in the south. Previous research shows a positive correlation between canopy cover and precipitation suggesting a water limitation on productivity. However, there has been minimal research on other possible sources of limitations, such as soil Nitrogen (N) and/or Phosphorus (P). We used a factorial in-situ experimental design to test for increased aboveground grass production (measured as peak season standing stock) under elevated soil P and Pþ N levels. Four sites along the KT precipitation gradient were used in this study: Mongu (Zambia), Pandamatenga (Botswana), Ghanzi (Botswana) and Tshane (Botswana). Soils at each site were amended with N and P fertilizers during the dry season. We extracted soil samples during the following growing season to analyze for plant available soil P. Vegetation samples were harvested from which we measured foliar P and aboveground grass biomass production. We saw differences in foliar P at the treatment and site level but not for the interaction between treatment and site. There were individual effects from site on biomass but not for any interactions with nutrient treatments. Despite higher levels of foliar P, we did not detect an increase in aboveground biomass. This may be explained by luxury uptake or allocation to below ground resources. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Kalahari en_US
dc.subject Phosphorous en_US
dc.subject Precipitation en_US
dc.subject Savanna en_US
dc.subject.lcsh Grass biomass en_US
dc.title Nutrient limitations on aboveground grass production in four savanna types along the Kalahari Transect en_US
dc.type Published Article en_US en_US

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