The study consists of 16 treatment units – stands ranging in size from 7 to 11 ha – within the H.J. Andrews Experimental Forest. Each unit is has assigned one of four alternative thinning regimes – unthinned (Control), light thin with patch openings (GAP), light thin (Light) or heavy thin (Heavy),. The stands are to be managed under these alternative regimes over several harvest cycles as the experiment evaluates alternative thinning regimes to convert uniform, even-aged stands, to structurally heterogeneous uneven-aged structure. Vegetation data collection occurred pretreatment (1997 or 1998) and post-treatment (2001, 2003, 2005 and 2010).
Cheryl Ann Friesen, Gabriel F. Tucker, James H. Mayo, Paul D. Anderson, Valerie Banner, William H. Emmingham
Evaluate alternative silvicultural approaches for converting uniform even-aged stands of Douglas-fir to more complex, uneven-aged stand structure and composition.