Composition of an Upland, Streamside Forest in Piatt County, Illinois

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Abstract
Oaks and hickories comprised 48% of the 224 trees/acre and 83% of the average stand basal area of 102 ft2/acre in a 34-acre portion of the Robert Allerton Park, located on rolling uplands along the Sangamon River. Such sites were among the 1st to be invaded by woody species following glaciation. The well-developed Gray-Brown Podzolic soils of the area reflect a longer period of forest occupancy than in the "Prairie Groves" which were characteristic of the Illinois Prairie Region. White oak (Quercus alba L.) and black oak (Q. velutina Lam.) were the leading dominants, followed in order of importance by red elm (Ulmus rubra Muhl.), pignut hickory (Carya glabra (Mill.) Sweet.), red oak (Quercus rubra L.), American elm (Ulmus americana L.), mockernut hickory (Carya tomentosa Nutt.), sugar maple (Acer saccharum Marsh.), white ash (Fraxinus americana L.), and shagbark hickory (Carya ovata (Mill.) K. Koch).

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