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ECOPHYSIOLOGY C. B. Zou P. W. Barnes S. Archer C. R. McMurtry

C. B. Zou ∆ P. W. Barnes ∆ S. Archer ∆ C. R. McMurtry
Soil moisture redistribution as a mechanism of facilitation
in savanna tree≠shrub clusters
Received: 24 August 2004 / Accepted: 24 March 2005 / Published online: 8 June 2005
” Springer-Verlag 2005
Abstract Plant≠soil water relations were examined in the
context of a selective removal study conducted in tree≠
shrub communities occupying different but contiguous
soil types (small discrete clusters on shallow, duplex soils
versus larger, extensive groves on deep, sandy soils) in a
subtropical savanna parkland. We (1) tested for the
occurrence of soil moisture redistribution by hydraulic
lift (HL), (2) determined the influence of edaphic factors
on HL, and (3) evaluated the significance of HL for
overstory tree≠understory shrub interactions. Diel cy-
cling and nocturnal increases in soil water potential
(Ysoil), characteristic signatures of HL, occurred inter-
mittently throughout an annual growth cycle in both
communities over a range of moisture levels (Ysoil=ņ0.5


Source: Archer, Steven R. - Savanna/Woodland Ecology Lab., School of Natural Resources and the Environment, University of Arizona


Collections: Environmental Sciences and Ecology