Abstract
ABSTRACT Field studies determined the spatial variability patterns of field-measured infiltration rates on a semiarid seeded rangeland near Eureka, Utah, USA. Two kinds of instruments, namely a double-ring infiltrometer and a modular type rainfall simulator, were used in both a moderately grazed pasture and an ungrazed exclosure (protected for over 20 years) to measure infiltration rates at 10 and 30 minutes. There were 104 grid points per instrument on a 24 m x 24 m grid (2 m spacing) at each site, with a total of 416 infiltrometer plots. Dependency of specific infiltration rate measurements on nearby measurements, as determined from autocorrelograms and semivariograms, was nonexistent. Percent cover (vegetation plus litter) explained from 18 to 36% of the variance associated with measured infiltration rates.
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