Evaluation of Spatial and Temporal Root Water Uptake Patterns of a Flood-Irrigated Pecan Tree Using the HYDRUS (2D/3D) Model
Publication: Journal of Irrigation and Drainage Engineering
Volume 139, Issue 8
Abstract
Quantitative information about the spatial and temporal patterns of compensatory root water uptake (RWU) in flood-irrigated pecan orchard is limited. We evaluated spatio-temporal compensated and uncompensated RWU patterns of mature pecan tree in a silty clay loam orchard using the HYDRUS (2D/3D) model. HYDRUS (2D/3D) simulations, which agreed well with measured water contents and temperatures at different soil depths and horizontal distances from the tree trunk, suggested that while both compensated and uncompensated RWU varied with soil depth they did not do so laterally because of similar spatial vertical distributions of root length density (RLD) for the under-canopy and the tree canopy dripline locations. Considering compensated RWU resulted in an increase in actual transpiration by 8%, and a decrease in evaporation and drainage by 5% and 50%, respectively, during a growing season. Simulated transpiration and relative transpiration (a ratio between actual and potential transpiration) values were correlated with measured transpiration and plant-based water stress indicators (stem and leaf water potentials), respectively. Overall, our results of the spatio-temporal compensatory RWU provide support to use HYDRUS (2D/3D) as a tool for managing efficient water use of pecan.
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Acknowledgments
We thank New Mexico State University Agricultural Experiment Station for support and the Specialty Crop Research Initiative (SCRI), USDA-NIFA for funding this research. We thank Dr. Rolston St. Hilaire, Department of Plant and Environmental Sciences, New Mexico State University, for providing LAI data and the LI-1600 porometer. Our thanks are to Mr. Ramakrishna R. Gopal for his help with PEST, and Dr. Parmodh Sharma and Dr. Pradip Adhikari with field sampling. We also thank Dr. Laurie Abbott, Department of Animal and Range Sciences, New Mexico State University, for allowing us to use plant root washing facilities.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 139 • Issue 8 • August 2013
Pages: 599 - 611
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Nov 8, 2012
Accepted: Mar 4, 2013
Published online: Jul 15, 2013
Published in print: Aug 1, 2013
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