2008 Joint Annual Meeting (5-9 Oct. 2008): Development of Multi-Functional Heat Pulse Probe for Soil Monitoring of Natural and Managed Ecosystems.
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699-22 Development of Multi-Functional Heat Pulse Probe for Soil Monitoring of Natural and Managed Ecosystems.



Wednesday, 8 October 2008
George R. Brown Convention Center, Exhibit Hall E
Jan Hopmans, 1 Shields Ave, University of California-Davis, Land Air Water Resources Dept, 123 Veihmeyer Hall, Davis, CA 95616, Gerard J. Kluitenberg, Department of Agronomy, Kansas State University, 2004 Throckmorton Hall, Manhattan, KS 66506, Jirka Simunek, Bourns Hall A135, University of California-Riverside, University of California-Riverside, Environmental Sciences, Riverside, CA 92521, Ben Shaw, Mechanical Engineering, University of California, Davis, CA 95616, Greg Pasternack, Land, Air and Water, University of California Davis, Davis, CA 95616, Atac Tuli, University of California-Davis, UC Davis, 1 Shields Ave,, Dept of LAWR, Veihmeyer Hall, Davis, CA 95616 and Tamir Kamai, Land, Air and Water Resources, University of California, Davis, 1 Shields Ave, Davis, CA 95616
The main objectives of this project is to develop a multi-functional heat pulse probe (MF-HPP) for simultaneous measurement of bulk soil thermal, water flow and solute transport properties, and to apply the HPP in root chamber experiments to measure and model root water and nitrate uptake in water-limited soil conditions. The HYDRUS-2D transport code was expanded, incorporating multi-dimensional root water and nutrient uptake under water-limited conditions. In addition, a more flexible computer model is being developed using COMSOL Multiphysics software that allows coupling of water, solute and heat transport for any 3-dimensional geometry of the HPP sensor. Various HPP proto types have been developed and tested, including those with wireless data transmission, to estimate soil water content, soil water fluxes, and soil salinity. In addition, we present the development of an in situ sensor using UV spectroscopy to measure soil solution nitrate to study plant nutrient uptake.
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