Monday, November 5, 2007 - 1:30 PM
105-1

Distribution and Formation of Two Calcareous Soils on the Southern High Plains of Texas.

Charlie Clark1, Wayne Hudnall2, and B. L. Allen2. (1) Texas Tech University, 4830 7th Street, Lubbock, TX 79416, (2) MS 42122, Texas Tech University, Plant & Soil Science Department, Lubbock, TX 79409

Landscape relationships are fundamental in understanding soil formation, distribution and occurrence.  A study was conducted on two calcareous soils on the Southern High Plains of Texas to better understand and predict their occurrence and variability across the landscape.  The two soils studied were the Estacado (fine-loamy, mixed, superactive, thermic Aridic Paleustolls) and the Bovina (fine-loamy, mixed, superactive, thermic Calcidic Paleustolls).  Physical, chemical, mineralogical, morphological characteristics were used as tools in addition to GIS (Geographic Information Systems) mapping.  GIS was used to examine landscape relationships such as depth to the calcic horizon and slope.  Sand/silt ratios, micromorphology, and carbonate percentages were used to study lithology.  Results support our hypothesis that parent materials of these soils resulted from more than one depositional episode.

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