Characterization and Genesis of a Sharpsburg-Wymore Soil Sequence in Southeastern Nebraska1
- Abdul M. Al-Janabi and
- James V. Drew2
Major belts of Sharpsburg and Wymore soils in southeastern Nebraska are related to a gradient of loess which varies from a continuous mantle adjacent to the Missouri river valley to a thin, discontinuoan mantle with increasing distance toward the southwest. Sharpsburg with a silty clay loam subsoil occurs where loess is relatively continuous, whereas Wymore with a silty clay subsoil occurs in thin and discontinuous loess farther from the river valley. Within these belts, soils with well-developed sub-soils frequently occupy high, relatively stable positions on interfluves, whereas soils with less well-developed subsoils occur on the beveled, younger surfaces of interfluve slopes.
In a transition zone between major belts of Sharpsburg and Wymore, however, a reverse situation exists. Here Sharpsburg occurs on the highest positions of interfluves and gives way to Wymore on beveled slopes at lower elevations. Morphological, particle size, and mineralogical data indicate that a sequence of soils within this transition zone increases in degree of development from the top to the side of an interfluve in the order Sharpsburg-Wymore. Hypotheses presented to explain the distribution of these soils on the landscape involve differences in soil moisture regime or rate of loess accumulation as influenced by slope characteristics.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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