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 redistri- bution 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 sig- nificant in maintaining root viability, facilitating root growth in dry soils and modifying resource availability.
DOI:
https://doi.org/10.1007/s004420050521Altmetric score:
Dimensions Citation Count:
Publication year
1998
Authors
Burgess S S O; Adams M A; Turner N C; Ong C K
Language
English
Keywords
eucalyptus camaldulensis, grevillea robusta, hydrology, multipurpose trees, root systems, sap flow, soil types, soil water, water, water transport
Geographic
Australia, Kenya
