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Published in Soil Sci Soc Am J 50:578-582 (1986)
© 1986 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Estimating Macroporosity in a Forest Watershed by use of a Tension Infiltrometer1

K. W. Watson and R. J. Luxmoore2

ABSTRACT

The ability to obtain sufficient field hydrologic data at reasonable cost can be an important limiting factor in applying transport models. A procedure is described for using ponded-flow- and tension-infiltration measurements to calculate transport parameters in a forest watershed. Thirty infiltration measurements were taken under ponded-flow conditions and at 3, 6, and 15 cm (H2O) tension. It was assumed from capillarity theory that pores >0.1-, 0.05-, and 0.02-cm diam, respectively, were excluded from the transport process during the tension infiltration measurements. Under ponded flow, 73% of the flux was conducted through macropores (i.e., pores >0.1-cm diam.). An estimated 96% of the water flux was transmitted through only 0.32% of the soil volume. In general the larger the total water flux the larger the macropore contribution to total water flux. The Shapiro-Wilk normality test indicated that water flux through both matrix pore space and macropores was log-normally distributed in space.

NOTES

1 Research sponsored by the Office of Health and Environmental Research, U.S. Dep. of Energy, under Contract no. DE-AC05-840R21400 with Martin Marietta Energy Systems, Inc. Publication no. 2661, Environmental Sciences Division, ORNL.

2 Research Associate, Univ. of Tennessee, Knoxville, and Research Staff Member, Oak Ridge National Laboratory, respectively. Address of Senior Author is Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831. Address of Senior author is currently Geraghty and Miller, Inc., P.O. Box 271173, Tampa, FL 33688-1173.

Received for publication September 6, 1986.


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