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Abstract
Accurate simulation of the effects of unevenaged management on future stand structure and species composition requires good empirical data on sapling growth, survival, and canopy recruitment, particularly as these dynamics are influenced by the number and size of canopy openings created at each harvest. In order to examine the response of various species to different levels of understory light and woody competition, we measured annual growth increments (1993-97) on tree saplings in 30 northern hardwood stands in north-central Wisconsin and adjacent western Upper Michigan. Understory conditions in the 100 “gap” plots sampled ranged from closed canopy to group selection openings (>400 m2). Average daily radiation received by individual saplings was estimated from computer analysis of hemispherical canopy photographs taken directly above the 510 subject saplings (size 25 cm tall to 10 cm dbh). In addition, data on woody competition experienced by subject trees were collected for all sapling and overstory trees in the plot.
Parent Publication
Citation
Goodburn, John M.; Lorimer, Craig S. 1999. Predicting sapling growth and recruitment in different size canopy gaps. In: Stringer, Jeffrey W.; Loftis, David L., eds. 1999. Proceedings, 12th central hardwood forest conference; 1999 February 28-March 1-2; Lexington, KY. Gen. Tech. Rep. SRS-24. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. 293 p
