Changes In Solum Chemistry Following Clearcutting of Northern Hardwood Stands

Abstract

AbstractTo assess the role of the soil in retaining nutrients after clearcutting, the sola beneath three even‐aged pin cherry (Prunus pensylvanica L.)‐birch (Betula alleghaniensis Britton and B. papyrifera Marsh.) stands were analyzed for post harvest changes in Ca, Mg, K, pH, organic carbon, titratable acidity, and loss‐on‐ignition. A 93‐year‐old second‐growth northern hardwood stand served as the preharvest comparison. The stands were located in central New Hampshire. The sites were selected to reduce influences from such external parameters as elevation, aspect, physiographic position, and parent material. Within each site, morphologically matched pedons of a single soil series were sampled. Mineral soil analysis indicated that organic matter may be translocated into the upper mineral horizon following the post‐harvest initiation of surface decomposition. A large influx of Ca, Mg, and K into the mineral soil was associated with this decomposition. Potassium concentrations showed a rapid increase throughout the solum soon after harvesting. Following an assumed reduction in counter ion leaching, Ca and Mg accumulation was apparent, particularly in spodic horizons high in soil organic matter. Exchangeable nutrient levels remained two to three times higher at the 30 yr post‐harvest relative to the preharvest site.