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Rooting depth and above-ground community composition in Kalahari sand woodlands in western Zimbabwe

Published online by Cambridge University Press:  01 March 2008

Ricardo M. Holdo  and
Jonathan Timberlake
Ricardo M. Holdo
Affiliation:
Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA
Jonathan Timberlake
Affiliation:
Biodiversity Foundation for Africa, P.O. Box FM 730, Famona, Bulawayo, Zimbabwe and Royal Botanic Gardens, Kew, Richmond TW9 3AB, UK
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Abstract:

The pattern of coarse-root distribution was analysed in the woody plant community along a 200-m edaphic gradient on a Kalahari sand woodland catena in Zimbabwe. The root systems of 45 trees and shrubs were excavated, mapped, and digitized to analyse rooting depth and architecture. Patterns of change in the above-ground community were also identified along this transect. Rooting depth increased, and the centre of mass of the root profile shifted towards the maximum rooting depth as a function of distance up the catena. The data also suggest that interspecific variation in rooting depth may increase up the catena. The below-ground pattern was accompanied by above-ground changes: species richness and basal area also increased up the catena. It is hypothesized that increasing soil depth allows greater coexistence of alternative water-use strategies, resulting in the observed increase in species richness up the catena.

Keywords

Baikiaea plurijugaBrachystegia spiciformiscatenacommunity assemblyroot architecturerooting profilessoil depthspecies turnovertree diversity
Type
Research Article
Information
Journal of Tropical Ecology , Volume 24 , Issue 2 , March 2008 , pp. 169 - 176
Copyright
Copyright © Cambridge University Press 2008

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References

LITERATURE CITED

CHILDES, S. L. 1984. The population dynamics of some woody species in the Kalahari sand vegetation of Hwange National Park. University of the Witwatersrand, Johannesburg. 195 pp.Google Scholar
CHILDES, S. L. & WALKER, B. H. 1987. Ecology and dynamics of the woody vegetation on the Kalahari sands in Hwange National Park, Zimbabwe. Vegetatio 72:111–128.CrossRefGoogle Scholar
COATES PALGRAVE, K. 1977. Trees of Southern Africa. Struik Publishers, Cape Town. 922 pp.Google Scholar
DIMITRAKOPOULOS, P. G. & SCHMID, B. 2004. Biodiversity effects increase linearly with biotope space. Ecology Letters 7:574–583.CrossRefGoogle Scholar
FARGIONE, J. & TILMAN, D. 2005. Niche differences in phenology and rooting depth promote coexistence with a dominant C-4 bunchgrass. Oecologia 143:598–606.CrossRefGoogle Scholar
FLINT, R. F. & BOND, G. 1968. Pleistocene sand ridges and pans in western Rhodesia. Geological Society of America Bulletin 79:299–314.CrossRefGoogle Scholar
JACKSON, R. B., CANADELL, J., EHLERINGER, J. R., MOONEY, H. A., SALA, O. E. & SCHULZE, E. D. 1996. A global analysis of root distributions for terrestrial biomes. Oecologia 108:389–411.CrossRefGoogle ScholarPubMed
MCKANE, R. B., GRIGAL, D. F. & RUSSELLE, M. P. 1990. Spatiotemporal differences in N-15 uptake and the organization of an old-field plant community. Ecology 71:1126–1132.CrossRefGoogle Scholar
NIKLAS, K. J. 1994. Plant allometry: the scaling of form and process. University of Chicago Press, Chicago. 412 pp.Google Scholar
PARRISH, J. A. D. & BAZZAZ, F. A. 1976. Underground niche separation in successional plants. Ecology 57:1281–1288.CrossRefGoogle Scholar
SCHENK, H. J. & JACKSON, R. B. 2002a. The global biogeography of roots. Ecological Monographs 72:311–328.CrossRefGoogle Scholar
SCHENK, H. J. & JACKSON, R. B. 2002b. Rooting depths, lateral root spreads and below-ground/above-ground allometries of plants in water-limited ecosystems. Journal of Ecology 90:480–494.CrossRefGoogle Scholar
SCHOLES, R. J. & WALKER, B. H. 1993. An African savanna: synthesis of the Nylsvlei study. Cambridge University Press, Cambridge. 306 pp.CrossRefGoogle Scholar
SCHULZE, E. D., MOONEY, H. A., SALA, O. E., JOBBAGY, E., BUCHMANN, N., BAUER, G., CANADELL, J., JACKSON, R. B., LORETI, J., OESTERHELD, M. & EHLERINGER, J. R. 1996. Rooting depth, water availability, and vegetation cover along an aridity gradient in Patagonia. Oecologia 108:503–511.CrossRefGoogle ScholarPubMed
SILVERTOWN, J., DODD, M. E., GOWING, D. J. G. & MOUNTFORD, J. O. 1999. Hydrologically defined niches reveal a basis for species richness in plant communities. Nature 400:61–63.CrossRefGoogle Scholar
STUBBS, W. J. & WILSON, J. B. 2004. Evidence for limiting similarity in a sand dune community. Journal of Ecology 92:557–567.CrossRefGoogle Scholar
TIMBERLAKE, J. & CALVERT, G. M. 1993. Preliminary root atlas for Zimbabwe and Zambia. Zimbabwe Bulletin of Forestry Research 10:1–96.Google Scholar
WALKER, B. H. & NOY-MEIR, I. 1982. Aspects of the stability and resilience of savanna ecosystems. Pp. 556–590 in Huntley, B. J. & Walker, B. H. (eds.). Ecology of tropical savannas. Springer-Verlag, Berlin.CrossRefGoogle Scholar
WALKER, B. H., LUDWIG, D., HOLLING, C. S. & PETERMAN, R. M. 1981. Stability of semi-arid savanna grazing systems. Journal of Ecology 69:473–498.CrossRefGoogle Scholar
WALTER, H. 1971. Ecology of tropical and subtropical vegetation. Oliver and Boyd, Edinburgh. 539 pp.Google Scholar
ZERIHUN, A., MONTAGU, K. D., HOFFMANN, M. B. & BRAY, S. G. 2006. Patterns of below- and above-ground biomass in Eucalyptus populnea woodland communities of northeast Australia along a rainfall gradient. Ecosystems 9:501–515.CrossRefGoogle Scholar