Uneven Aged Management Project (UAMP), Andrews Experimental Forest

  • Creator(s): William H. Emmingham, Gabriel F. Tucker, Paul D. Anderson
  • PI(s): Paul D. Anderson
  • Originator(s): William H. Emmingham, Gabriel F. Tucker
  • Other researcher(s): Cheryl Ann Friesen
  • Dates of data collection: Jun 1 1997 - Jul 26 2005
  • Data collection status: Study collection is completed and no new collection is planned
  • Data access: Online
  • DOI:
  • Access constraint: Acknowledgement of the USFS Pacific Northwest Research Station and the Willamette National Forest.
  • Last update: Feb 13 2018 (Version 2)
<Citation>     <Acknowledgement>     <Disclaimer>    
Emmingham, W.; Tucker, G.; Anderson, P. 2018. Uneven Aged Management Project (UAMP), Andrews Experimental Forest. Uneven-aged Management Project. Forest Science Data Bank, Corvallis, OR. [Database]. Available: Accessed 2023-12-11.
Data sets were provided by the Forest Science Data Bank, a partnership between the Department of Forest Science, Oregon State University, and the U.S. Forest Service Pacific Northwest Research Station, Corvallis, Oregon. Significant funding for these data was provided by the National Science Foundation Long-Term Ecological Research program (DEB-02-18088).
While substantial efforts are made to ensure the accuracy of data and documentation, complete accuracy of data sets cannot be guaranteed. All data are made available 'as is'. The Andrews LTER shall not be liable for damages resulting from any use or misinterpretation of data sets.
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).

Study Description Study Site Map Taxonomic Hierarchy Download Study Location Information: (CSV)
Ecological Metadata Language: (EML)
1Overstory tree and snag data (Jun 30 1998 - Jul 21 2005)METADATADATA
Tree and snag diameter measurements, condition classes, and a subsample of tree heights for each 0.1 ha circular measurement plot.
2Low shrub, forb, fern, grass and ground substrate cover data (Jun 30 1997 - Jul 21 2005)METADATADATA
Eight micro-plots per transect are sampled for percent cover by Species or Ground Surface Features at 1.6-meter interval along a 14.6 m horizontal transect; two transects per 0.1 ha measurement plot.
3Plot species inventory (Jun 30 1997 - Jul 26 2005)METADATADATA
All species observed within the 0.1 ha plot perimeter (17.84 m radius) were recorded. Species were categorized into life-form groups: tree, shrub, herb, fern, grass, and bryophyte.
4Tall shrub and small tree canopy cover data (Jun 30 1997 - Jul 25 2005)METADATADATA
Canopy cover of understory trees (< 5 cm DBH) and tall shrubs determined as the total proportional length of a 14.5 m horizontal transect intecepted by the vertical projection of the vegetation canopy; two transects per 0.1 ha plot.
5Seedling and sapling density data (Jul 1 1997 - Jul 22 2005)METADATADATA
Count of all seedlings and saplings by height class in a 14.6 m x 1.5 m strip plot; two strip plots per 0.1 ha sample plot.
6Overstory canopy closure data (Jun 30 1998 - Jul 21 2005)METADATADATA
Percent canopy closure defined by percent of sky view occluded by all live foliage, any part of tree bole, limbs and or snags; conifers and hardwoods must have a dbh > 5 cm.

 Field Sampling Protocol - Uneven-Aged Management Project (UAMP) Field Sampling Protocol (Updated: August 2009)

 Uneven age forest management study site locations, Andrews Experimental Forest (TP116)

 Wilson, Duncan S., Anderson, Paul D., Puettmann, Klaus J. 2009, Evaluating the consistency of understorey vegetation response to forest thinning through synthetic analysis of operational-scale experiments (Pub. No: 4759)
 Anderson, Paul D. 2007, Understory vegetation responses to initial thinning of douglas-fir plantations undergoing conversion to uneven-age management (Pub. No: 4745)