TV019

Cone production of upper slope conifers in the Cascade Range of Oregon and Washington, 1959 to 2022

• Creator(s): Jerry F. Franklin, Mark D Schulze
• PI(s): Mark D Schulze
• Originator(s): Jerry F. Franklin
• Other researcher(s): John Moreau, Julia A. Jones, Greg M Cohn
• Dates of data collection: Jun 1 1959 - Sep 24 2022
• Data collection status: Study continues and further data collection is planned
• Data access: Online
• DOI: https://doi.org/10.6073/pasta/834405bb4b14582a8f444011f9158740
• Last update: Mar 24 2023 (Version 16)

<Citation>     <Acknowledgement>     <Disclaimer>    

Franklin, J.; Schulze, M. 2023. Cone production of upper slope conifers in the Cascade Range of Oregon and Washington, 1959 to 2022. Long-Term Ecological Research. Forest Science Data Bank, Corvallis, OR. [Database]. Available: http://andlter.forestry.oregonstate.edu/data/abstract.aspx?dbcode=TV019. https://doi.org/10.6073/pasta/834405bb4b14582a8f444011f9158740. Accessed 2024-05-01.

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.

ABSTRACT:
	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) Ecological Metadata Language: (EML)

ENTITY TITLES:
1	Plots and species	METADATA	DATA
	Specific geographic location (state and national forest) for each plot
2	Cone Counts (Jun 1 1959 - Sep 24 2022)	METADATA	DATA
	Annual cone count by plot
3	Tree Diameters (Jun 1 1959 - Sep 30 1995)	METADATA	DATA
	Tree DBH and near tree number
4	Directions to plots	METADATA	Data not online
	Driving directions for each plot; for administrative puposes only
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