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Trends in savanna structure and composition along an aridity gradient in the Kalahari

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dc.contributor.author Scholes, RJ en_US
dc.contributor.author Dowty, PR en_US
dc.contributor.author Caylor, K en_US
dc.contributor.author Parsons, DAB en_US
dc.contributor.author Frost, PGH en_US
dc.contributor.author Shugart, HH en_US
dc.date.accessioned 2007-03-26T07:11:38Z en_US
dc.date.accessioned 2007-06-07T10:01:47Z
dc.date.available 2007-03-26T07:11:38Z en_US
dc.date.available 2007-06-07T10:01:47Z
dc.date.copyright en_US
dc.date.issued 2002-06 en_US
dc.identifier.citation Scholes, RJ, et al. 2002. Trends in savanna structure and composition along an aridity gradient in the Kalahari. Journal of Vegetation Science, vol. 13(3), pp 419-428 en_US
dc.identifier.issn 1100-9233 en_US
dc.identifier.uri http://hdl.handle.net/10204/2027 en_US
dc.identifier.uri http://hdl.handle.net/10204/2027
dc.description.abstract The Kalahari sand sheet occupies 2.5 million ha in southern Africa. It is an area with relatively similar deep Aeolian soils, and a strong south to north gradient in rainfall, from 200 to 1000 mm mean annual precipitation (MAP) in the region studied. This provides an excellent basis for gradient studies at the sub continental scale. This paper briefly reviews the literature on the vegetation of the Kalahari and describes the vegetation structure and composition at 11 new sites. There is a clear gradient in woody plant biomass (as indexed by basal area) from south to north. Above the minimum level of 200 mm MAP, the woody basal area increases at a rate of ca. 2.5 m2.ha (-1) per 100 mm MAP. Mean maximum tree height also increases along the gradient, reaching 20 in at ca. 800 mm MAP. The number of species to contribute > 95% of the woody basal area increases from one at 200 mm to 16 at 1000 mm MAP. Members of the Mimosaceae (mainly Acacia) dominate the tree layer up to 400 mm MAP. They are replaced by either the Combretaceae (Combretum or Terminalia) or Colophospermum mopane of the Caesalpinaceae between 400 and 600 mm MAP, and by other representatives of the Caesalpinaceae above 600 mm MAP. The vegetation is largely deciduous up to 1000 mm MAP, except for species that apparently have access to groundwater, which may be locally dominant above about 600 mm MAP. en_US
dc.format.extent 199554 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en en_US
dc.publisher Opulus Press Uppsala en_US
dc.rights Copyright: 2002 Opulus Press Uppsala en_US
dc.source en_US
dc.subject Vegetation structure en_US
dc.subject Biomass en_US
dc.subject Kalahari en_US
dc.subject Shrub lands en_US
dc.subject Tree height en_US
dc.subject woodlands en_US
dc.subject Plant sciences en_US
dc.subject Ecology en_US
dc.subject Forestry en_US
dc.title Trends in savanna structure and composition along an aridity gradient in the Kalahari en_US
dc.type Article en_US


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