期刊
JOURNAL OF ARID ENVIRONMENTS
卷 72, 期 5, 页码 624-632出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaridenv.2007.09.006
关键词
Adesmia bedwellii; arid ecosystem; dimorphic roots; Porlieria chilensis; soil water potential
Hydraulic lift is defined as the passive movement of water through roots from wetter, deeper soil layers into drier shallower layers along a gradient in soil water potential. This process is generally found in plant species with dimorphic root systems, which use water from both shallow and deep layers. We assessed the ability of three shrub species of the Chilean coastal desert, Porlieria chilensis, Adesinia bedwellii and Proustia cuneifolia, to act as hydraulic lifters. Our results showed evidences that the three species are hydraulic lifters with larger fluctuations of soil water potentials in summer 2004 and smaller fluctuations in winter 2004 and summer 2005. The soil water potential was higher beneath P. chilensis than beneath P. cuneifolia and A. bedwellii. Soils were significantly wetter at 60 cm than at 30 cm depth. The movement of water from wetter and deeper soil layers to drier and shallower soil layers through hydraulic lift may allow these shrubs to extend their metabolic activity into the lengthy drought period that characterizes the Chilean desert ecosystems. (c) 2007 Elsevier Ltd. All rights reserved.
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