Uptake of water from a Kandosol subsoil: I. Determination of soil water diffusivity

David M. Deery, John B. Passioura, Jason Condon, Asitha Katupitiya

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Aims: To determine soil water diffusivity, D('), on undisturbed field soil at medium to low water content (suction range from 10 to 150 m of water), for the purpose of modeling the uptake of water by plant roots.Methods: The method is based on the analysis of onestep outflow induced by a turbulent stream of dry air over the exposed end of a soil core, with the other endof the core enclosed. The outflow is measured through time as the change in the weight of the core as it sits on a recording balance. D(') is calculated by deconvolutingthe measured outflow function.Results: Over the suction range of 10 to 150 m of water, D(') calculated on the undisturbed soil ranged from 20×10'9 to 10×10'9 [m2s'1], substantially higher than other published estimates over this range in suction.
Original languageEnglish
Pages (from-to)483-492
Number of pages10
JournalPlant and Soil
Volume1-2
Issue number368
Early online dateNov 2012
DOIs
Publication statusPublished - Jul 2013

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