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Early Effects of Forest Vegetation and Topographic Position on Dark-Colored, Prairie-Derived Soils¹

ABSTRACT

A complete development range of soils from the Humic Gley (Haplaquolls) and Brunizem (Argiudolls) soils of the original tall grass prairie to well-developed Brunizem-Gray-Brown Podzolic Intergrade (Mollic and Aquollic Hapludalfs) soils was studied in a recently forested "Prairie Grove" remnant in eastcentral Illinois. The first measurable changes occur in organic carbon, cation exchange capacity, and base saturation. Alterations in color and structural development which distinguish a minimal A2 horizon are followed by accelerated movement of clay from the A to B horizons. Differences in soil development in an area of uniform forest occupancy are related to the physiographic position of the soil units and the subsequent retarding of normal forest soil development by conditions of excessive soil moisture.

¹ Contribution from Departments of Forestry & Agronomy, Illinois Agr. Exp. Sta., Urbana.

² Former Research Assistant, Professor of Forestry, and Assistant Professor of Pedology, in Agronomy, respectively. The senior author is now Instructor, State University College of Forestry at Syracuse University, Syracuse, New York.

Received for publication February 10, 1969. Accepted for publication October 3, 1969.