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Published in Soil Sci Soc Am J 31:161-164 (1967)
© 1967 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Measurement of Water Loss by Mesquite (Prosopis glandulosa var. glandulosa Torr.) Using the Thermoelectric Method1

C. W. Wendt, J. R. Runkles and R. H. Haas2

ABSTRACT

The quantitative aspects of the thermoelectric method were investigated in a controlled environment chamber using mesquite (Prosopis glandulosa var. glandulosa Torr.). A high degree of correlation for trees less than 10 mm in diameter (r = 0.97) was obtained between water transpired and the product of the cross-sectional area of the stem and the relative sap velocity. As the size of trees increased the correlation decreased due to variations in relative sap velocities around the circumference of larger trees. Although the correlation coefficient was high for trees less than 10 mm in diameter, the coefficient of variation was 15.6% which was probably due to the variation in the moisture content of the plants.

NOTES

1 A contribution of the Soil and Crop Sciences and Range Science Department, Texas Agr. Exp. Sta., Texas A&M Univ., College Station. Presented before a joint meeting of Div. S-1 and S-6 Soil Sci. Soc. Amer., Columbus, Ohio, Nov. 1965. Approved by the Director of the Texas Agri. Exp. Sta. as Tech. Article 5464.

2 Research Assistant in Soil Physics, Professor of Soil Physics, and Assistant Professor of Range Science, respectively. Present address of the senior author: South Plains Research and Extension Center, Route 3, Lubbock, Texas.

Received for publication August 8, 1966. Accepted for publication November 18, 1966.






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