Messenger, A. Steven||Flemal, Ronald C.
M.S. Ed. (Master of Education)
Department of Geography
Forests and forestry--Illinois--De Kalb County; Forest soils
The southern boundary of the Northern Hardwood Forest in the central Great Lakes states is approximately 42°N, and overlaps the area of Oak- Hickory Forest dominance. This paper assesses some of the factors responsible for the segregation of a Northern Hardwood Forest association from an adjacent Oak- Hickory Forest association. The study area is Chief Shabbona Forest Preserve, an 86 acre tract of timber in extreme southern De Kalb County, Illinois. Six soil pits were excavated in the study area, three within each of the two forest associations. Morphological descriptions and determination of soil pH, humus content, texture, exchangeable calcium, potassium and magnesium were conducted on sample profiles. Depth of loess, relative land surface elevation and depth to mottling were determined along a line transect extending through both associations. Results indicate that differences in topographic position between the two sides of the preserve have determined the succession and length of dominance of forest associations on the opposite sides of the woodland. Appreciable differences in depth of the water table evidently favored a longer period of dominance of a spruce-fir forest association on one side, and the rapid encroachment of northern hardwoods on the other. Different forest histories as well as different sequences of their soil-forming factors have likely been responsible for the distinct differences in present soils and forest types found within the preserve.
Hodur, Richard D., "Soil and soil formation factors in relation to the segregation of a northern hardwood forest and an oak-hickory forest in northern Illinois" (1971). Graduate Research Theses & Dissertations. 4964.
vii, 50 pages
Northern Illinois University
Rights Statement 2
NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.