Seasonal Water Acquisition and Redistribution in the Australian Woody Phreatophyte, Banksia prionotes

Sap flows in the xylem of plant roots in response to gradients in water potential, either between soil and atmosphere (transpiration) or soil layers of different moisture content (termed hydraulic redistribution). The latter has the potential to influence water budgets and species interactions, but...

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Bibliographic Details
Published in:Annals of botany 2000-02, Vol.85 (2), p.215-224
Main Authors: BURGESS, STEPHEN S.O., PATE, JOHN S., ADAMS, MARK A., DAWSON, TODD E.
Format: Article
Language:English
Subjects:
Banksia prionotes
Banksia prionotes, sap flow, hydraulic lift, heat ratio method, deuterium, stable isotopes, root architecture
deuterium
Dyes
Groundwater
heat ratio method
hydraulic lift
Hydraulics
Plant roots
root architecture
Sap flow
Soil hydraulic properties
Soil water
Soil water content
stable isotopes
Water uptake
Xylem
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Summary:Sap flows in the xylem of plant roots in response to gradients in water potential, either between soil and atmosphere (transpiration) or soil layers of different moisture content (termed hydraulic redistribution). The latter has the potential to influence water budgets and species interactions, but we lack information for all but a few plant communities. We combined heat pulse measurements of sap flow with dye and isotope tracing techniques to gauge the movement of xylem sap within, and exudation from, roots of Banksia prionotes (Lindley). We demonstrated ‘ hydraulic lift’ during the dry season and provide some evidence that extremely dry soils limit hydraulic lift. In addition we report difficulties posed by spiralled xylem tissue in roots for the application of heat pulse techniques.
ISSN:0305-7364
1095-8290
DOI:10.1006/anbo.1999.1019