Scott Demyan and Neil Smeck. School of Natural Resources, The Ohio State University, 2120 Coffey Road, Columbus, OH 43210
Stripmining of coal and subsequent reclamation provides an opportunity to examine the early stages of soil evolution in these landscapes created with minespoil. In 1978 immediately following reclamation of a stripmine in Coshocton County, Ohio, data were collected to characterize chemical and physical properties of the minesoil. Reclamation included grading of spoil to approximate original contour and replacement of roughly 20 cm of soil (stockpiled prior to mining) on the surface, prior to establishment of grass cover. The objectives of this study are to (i.) examine changes that have occurred since reclamation in 1978, (ii.) identify relationships between minesoil properties and variables such as aspect, replaced soil thickness, vegetation, and slope position, and (iii.) quantify changes in spatial variability of replaced soil and underlying spoil. During the 2004-05 academic year, samples were collected from grid points that were established and sampled 28 years ago. Due to the development of a darkened surface layer in the replaced soil, two samples were collected from the soil layer and one from the spoil below the soil contact. Initial data document a 6-fold gain in organic carbon and a 2-fold gain in extractable Ca2+ in the upper portion of the soil layer. Other changes noted are a loss of both extractable Ca2+ and Mg2+ from the lower portion of the soil layer and underlying spoil and a slight decrease in pH of both soil and spoil. These data suggest that cycling of Ca2+ to the surface by vegetation and melanization have been the two dominant pedogenic processes during the past 28 years. Data necessary to address cambic horizon development for possible reclassification of these minesoils from Entisol to Inceptisol are currently being collected.
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Back to The ASA-CSSA-SSSA International Annual Meetings (November 6-10, 2005)