Abstract
AbstractIn Typic Hapludalfs formed in Peoria loess along the Mississippi River Valley from Mississippi to Minnesota, the base status distinctly and abruptly differs at 37° to 38°N latitude. The Memphis soils to the south are more intensively and deeply leached of bases than Alford and Fayette soils to the north. This change coincides with an abrupt historic climatic difference in precipitation (normal and effective). Paleoclimatic reconstruction shows that the climatic boundary could have persisted throughout the Holocene and its changing environments. The constancy of climatic difference through time can account for the soil differences at the critical latitude.
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