Abstract
In the period 1953–1954, five levels of thinning were imposed as part of a crop tree release study on a 32-year-old mixed stand of scarlet oak ( Quercus coccinea Muench.) and black oak ( Quercus velutina Lam.) located in southeastern Missouri. In winter 1985, 162 live trees were felled (90 scarlet oaks and 72 black oaks). A section of 10 cm thickness was cut from the base of each butt log. Dendrochronological techniques were used to gather and prepare data to compare treatment responses. Although there was a significant differential treatment response attributable to thinning, the timing of this response varied between the two species. Black oaks had a 10 year period of increased differential growth immediately after the thinning whereas the scarlet oaks, with a 12 year differential growth period, lagged 6–7 years behind. This was not apparent using the standard inventory techniques of periodic diameter measurements.
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