Plant biomass dynamics following logging, burning, and thinning in Watersheds 6 and 7, Andrews Experimental Forest, 1979 to present

  • Creator: Mark E. Harmon, Kari B. O'Connell
  • PI: Mark E. Harmon
  • Originator: Kari B. O'Connell
  • Other researchers: Robert J. Pabst, Frederick J. Swanson, James H. Mayo
  • Dates of data collection: Jul 9 1979 - Aug 20 2014
  • Data collection status: Study continues and further data collection is planned
  • Data access: Online
  • DOI:
  • Last update: Dec 22 2015 (Version 7)
<Citation>     <Acknowledgement>     <Disclaimer>    
Harmon, M.; O'Connell, K. 2015. Plant biomass dynamics following logging, burning, and thinning in Watersheds 6 and 7, Andrews Experimental Forest, 1979 to present. Long-Term Ecological Research. Forest Science Data Bank, Corvallis, OR. [Database]. Available: Accessed 2021-08-04.
Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 2025755), US Forest Service Pacific Northwest Research Station, and Oregon State University.
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.
In 1974, Watershed 6 was clearcut and watershed 7 was shelterwood cut for the purposes of 1) comparing volume growth for the residual stand after shelterwood harvest with pretreatment growth and concurrent growth of a nearby stand, 2) comparing survival and height growth of both planted and natural regeneration on the clearcut and shelterwood watersheds, and 3) correlating seedling survival and height growth with amount of light (canopy density estimate), competition from lesser vegetation, type of seedbed material, and soil-air interface temperatures on watersheds 6 and 7. In the fall of 2001, WS7 was thinned to 220 trees per acre. This study includes vegetation measurements taken in the summer of 2002 in watersheds 6 and 7 for the purpose of characterizing plant succession after thinning in a small, high-elevation watershed.

Study Description Study Site Map Taxonomic Hierarchy Download Study Location Information: (CSV)
Download Full Documentation: (PDF)(EML)
1Individual tree remeasurement (Jun 1 2002 - Aug 20 2014)METADATAData not online
These data are available through TV010 entity 2
4Ground Surface Cover Types METADATADATA
5Understory Vegetation Cover (Aug 31 2003 - Aug 31 2008)METADATADATA
6Biomass Measurements METADATADATA
9Vegetation cover estimates (Jul 9 1979 - Dec 18 1995)METADATADATA

 WS6 and WS7 Vegetation Research and History - Report based on original study plan and establishment report for vegetation research in watersheds 6 and 7.
 WS6 and WS7 plot layout - Schematics of various plot layouts for given measurements
 WS6 and WS7 original maps - Original maps of watersheds with transect and plot layouts, including riparian areas.

 Long-term growth, mortality and regeneration of trees in permanent vegetation plots in the Pacific Northwest, 1910 to present (TV010)
 Post-logging community structure and biomass accumulation in Watershed 10, Andrews Experimental Forest , 1974 to present (TP041)
 Ecosystem dynamics in a mature (Hagan block) and old-growth (Watershed 2) forest, Andrews Experimental Forest, 1981 to present (TP091)
 Plant succession and biomass dynamics following logging and burning in Watersheds 1 and 3, Andrews Experimental Forest, 1962 to Present (TP073)
 Plant biomass dynamics in old-growth Watersheds 8 and 9 at the Andrews Experimental Forest, 2003 to present (TP115)