Some Measured and Simulated Plant Water Relations of Yellow-poplar
Data from an experimental study of the water relations of yellow-poplar (Liriodendron tulipifera L.) on a silt loam soil were compared with simulation results from an hourly soil-plant water relations model. Simulated annual evapotranspiration was very similar for the 2 years studied even though rainfall and drainage through the root zone in the second year were higher by 28 cm. Water uptake from the B1 horizon supplied 83 percent of the simulated transpiration. Experimental values of leaf water potential matched or were somewhat higher than simulated values. The comparison suggested that deep roots may have an important influence on plant water potential. The model results approximated hourly stomatal dynamics on about half of the measurement occasions. Simulation results for five sunny days following rainfall showed that the vegetative surface conductance and water potential had midday minima that decreased during the drying period. Evapotranspiration decreased as water stress increased, and the simulated flux of water back into the root zone from deeper soil contributed 18 percent of the water evapotranspired in the 5-day period. The simulation forecasted that soil water potentials decreased below -5 bars on more occasions than were observed in periodic soil water measurements. Forest Sci. 24:327-341.
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Document Type: Journal Article
Affiliations: Office of Industrial Siting Administration, Boyd Bldg., Suite 500, Cheyenne, Wyoming 82002
Publication date: 1978-09-01
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- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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