Abstract:
:Plant roots transfer water between soil layers of different water potential thereby significantly affecting the distribution and availability of water in the soil profile. We used a modification of the heat pulse method to measure sap flow in roots of Grevillea robusta and Eucalyptus camaldulensis and demonstrated a redistribution of soil water from deeper in the profile to dry surface horizons by the root system. This phenomenon, termed "hydraulic lift" has been reported previously. However, we also demonstrated that after the surface soils were rewetted at the break of season, water was transported by roots from the surface to deeper soil horizons - the reverse of the "hydraulic lift" behaviour described for other woody species. We suggest that "hydraulic redistribution" of water in tree roots is significant in maintaining root viability, facilitating root growth in dry soils and modifying resource availability.
journal_name
Oecologiajournal_title
Oecologiaauthors
Burgess SS,Adams MA,Turner NC,Ong CKdoi
10.1007/s004420050521subject
Has Abstractpub_date
1998-07-01 00:00:00pages
306-311issue
3eissn
0029-8549issn
1432-1939pii
10.1007/s004420050521journal_volume
115pub_type
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