Plant biomass dynamics in old-growth Watersheds 8 and 9 at the Andrews Experimental Forest, 2003 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, Mark E. Harmon
  • Dates of data collection: Jun 1 2003 - Jan 1 2010
  • Data collection status: Study continues and further data collection is planned
  • Data access: Online
  • Last update: Jun 29 2005 (Version 2)
<Citation>     <Acknowledgement>     <Disclaimer>    
Harmon, M.; O'Connell, K. 2005. Plant biomass dynamics in old-growth Watersheds 8 and 9 at the Andrews Experimental Forest, 2003 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.
On the HJ Andrews Experimental Forest, OR, studies on paired small watersheds compared site productivity for locations with diverse environmental attributes. For study code TP115, Watershed 8 and Watershed 9 were measured in 2003 with a series of 17.82 m radius plots on multiple transects in each watershed. Watershed 8 is an unmanaged small watershed (median elevation 3600 feet) with a dynamic and varied history of fire disturbance. Watershed 9 is lower (median elevation 1750 feet) unmanaged small watershed and has less disturbance apparent in the extant forest. Trees, shrubs, and herbal vegetation were measured. The understory vegetative cover by species and species-specific structural characters were measured in 4 m square quadrats, while the all trees = 5.0 cm DBH were tagged and measured for diameter. Tree crown closure in each plot was measured by ocular estimate. Biomass estimates for each watershed was generated from the plots with equations in Biopak (Means, et al., 1994).

Study Description Taxonomic Hierarchy Download Study Location Information: (CSV)
Download Full Documentation: (PDF)(EML)
1Plot and quadrat level data, surface cover METADATADATA
2Biomass measurements METADATADATA
3Individual tree remeasurement METADATAData not online
These data are available through TV010 entity 2
4Whole plot species lists METADATADATA

 WS8 and WS9 Sampling Protocol and Plot Layout - Sampling protocol including a schematic of plot sampling layout
 WS8 and WS9 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 following logging, burning, and thinning in Watersheds 6 and 7, Andrews Experimental Forest, 1979 to present (TP114)