SPATIAL VARIABILITY OF SOLUBLE SALT CONTENT IN A MANCOS SHALE WATERSHED

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Abstract

A study was conducted to examine data collected in the microwatershed land process studies with regard to quantifying spatially variable soil properties. All 35 sampling sities were classified as occurring on the Mancos shale formation within a 777 km2 (300 mi2) area of the Price River Basin. Samples were taken at 0–2.5, 2.5–7.5, and 7.5–15.0-cm depths. Using the electrical conductivity (EC) of either the 1:1 or saturation extract as the salinity index parameter, it was found that EC values were distributed log-normally about the mean EC value of 35 observations. The coefficient of determination for the log-normal statistical plots was r2 = 1.00 for all three depths sampled at the 35 sites. The variance in the EC values increased with depth.

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