Stump sPROUT dominance probabilities of five oak species in southern Indiana 25 years after clearcut harvesting

by

Dale R. Weigel, Daniel C. Dey, Callie J. Schweitzer, and Chao-Ying Joanne Peng

(DRW)Forester (Retired), USDA Forest Service, Bedford, IN 47421;(DCD) Research Forester, USDA Forest Service, Northern Research Station, Columbia, MO 65211; (CJS) Research Forester, USDA Forest Service, Southern Research Station, Huntsville, AL 35801; and (CJP) Professor (Retired), Indiana University, Bloomington, IN 47405

Abstract – Oak stump sprouts are vital to sustaining oak’s presence and long-term dominance when regenerating oak-, mixed-hardwood forests. A study was initiated on the Hoosier National Forest in southern Indiana in 1987 to predict the sprouting potential and dominance probability of oaks. Before clearcutting, we sampled 2,188 trees of 5 oak species: white oak (Quercus alba L.), chestnut oak (Q. prinus L.), black oak (Q. velutina Lam.), scarlet oak (Q. coccinea Muenchh.), and northern red oak (Q. rubra L.). Measurements were taken after 25 years to develop sprouting and dominance probability models. A dominant oak was one that had 1 or more sprouts per stump in the dominant or codominant crown class 25 years after clearcutting. We used logistic regression to develop models for estimating dominance probabilities of the five species. Two models were developed that predict future sprout dominance based on a preharvest stand inventory and four models were developed based on measurements of stump sprouts and competing vegetation 1 or 5 years postharvest. Managers can use our models to anticipate regeneration failures before harvesting or sprout success after harvest.