Cone production of upper slope conifers in the Cascade Range of Oregon and Washington, 1959 to present

  • Creator: Jerry F. Franklin, Mark D Schulze
  • PI: Mark D Schulze
  • Originator: Jerry F. Franklin
  • Other researchers: John Moreau, Julia A. Jones, Greg M Cohn
  • Dates of data collection: Jun 1 1959 - Sep 22 2019
  • Data collection status: Study continues and further data collection is planned
  • Data access: Online
  • Last update: Sep 30 2019 (Version 14)
<Citation>     <Acknowledgement>     <Disclaimer>    
Franklin, J.; Schulze, M. 2019. Cone production of upper slope conifers in the Cascade Range of Oregon and Washington, 1959 to present. Long-Term Ecological Research. Forest Science Data Bank, Corvallis, OR. [Database]. Available: Accessed 2020-08-15.
Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 1440409), 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.
Seed supply is a key feature of tree population dynamics, and seed production may be indicative of environmental and biological drivers. This study examines cone production in upper-slope, true fir-hemlock forests of the Pacific Northwest, starting in 1959 to the present. Annual surveys of cone counts of Abies spp. (A. amabilis, A. concolor, A. grandis, A. lasiocarpa, A. magnifica, A. procera), Pinus spp. (P. engelmannii, P. lamberti, P. monticola), and Tsuga spp. (T mertsiana) have been conducted at sixty-one plots in 37 locations in nine national forests in Washington and Oregon (originally 10 national forests, but Mt. Baker and Snoqualimie were combined). At each site, a visual count is made of cone production in each of a number (20-30) trees in a stand of one tree species. At some plots, additional trees were added in the 1980s. Primary data include numbers of counts per tree per year, periodic measurements of tree diameter, and the names of the sites. These data illustrate the periodicity of cone production cycles, as well as longer trends associated with climate change and variability in the region.

Study Description Study Site Map Taxonomic Hierarchy Download Study Location Information: (CSV)
Download Full Documentation: (PDF)(EML)
1Plots and species METADATADATA
2Cone Counts (Jun 1 1959 - Sep 22 2019)METADATADATA
3Tree Diameters (Jun 1 1959 - Sep 30 1995)METADATADATA
4Directions to plots METADATAData not online

 Franklin, Jerry F., Carkin, Richard, Booth, Jack 1974, Seeding habits of upper-slope tree species: 1. A 12-year record of cone production (Pub. No: 117)
 Franklin, Jerry F. 1968, Cone production by upper-slope conifers (Pub. No: 1765)