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This article in SSSAJ

  1. Vol. 52 No. 6, p. 1722-1731
     
    Received: Sept 18, 1987
    Published: Nov, 1988


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doi:10.2136/sssaj1988.03615995005200060039x

Calciustolls in Central Texas: I. Parent Material Uniformity and Hillslope Effects on Carbonate-Enriched Horizons

  1. L. T. West ,
  2. L. P. Wilding,
  3. C. T. Hallmark and
  4. C. R. Stahnke
  1. Dep. of Agronomy, Univ. of Georgia, Athens, GA 30602
    Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843
    Texas Agric. Exp. Stn. and Dep. of Agriculture, Tarleton State Univ., Stephenville, TX 76401

Abstract

Abstract

Most soils associated with soft, Cretaceous limestones in Texas occupy moderately to strongly sloping erosional landforms and are underlain by interbedded weakly to strongly indurated limestone. Fourteen pedons from four hillslopes in these landscapes were sampled to evaluate soil parent materials and the effect of hillslope position on genesis of the soils and carbonate-enriched horizons. Clay-free, carbonate-free particle size distribution and elemental analysis of the residue silt fraction indicate that the soils had developed from stratified parent materials. Calcareous microfossils observed in thin section and siliceous microfossils observed with scanning electron microscopy indicate the soil parent materials to be primarily limestone of composition similar to that underlying the soils. Dust is being added to the soil surface at a rate of 1 to 2 mm/100 yr but has not been an important parent material amendment. The primary effect of hillslope position on genesis of soils and carbonate-enriched horizons is through site stability. No consistent relationships were observed between soils on backslope and summit positions, and expression of carbonate-enriched horizons.

Contribution from the Dep. of Soil and Crop Sciences, Texas A&M Univ. and Texas Agric. Exp. Stn. no. TA-23188.

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