Study ID 214

Long-term growth mortality and regeneration of trees in permanent vegetation plots in the Pacific Northwest 1910 to present

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Realm: Terrestrial
Climate: Temperate
Biome: Temperate coniferous forest
Central latitude: 45.342960
Central longitude: -122.799000
Duration: 88 years, from 1910 to 2010

37350 records

39 distinct species

Across the time series Tsuga heterophylla is the most frequently occurring species


Harmon, M. & Franklin, J. (2012) “Long-term growth, mortality and regeneration of trees in permanent vegetation plots in the Pacific Northwest, 1910 to present.” Long-Term Ecological Research. Forest Science Data Bank, Corvallis. Available at:, accessed 2012.


A network of more than 130 permanent vegetation plots provides long-term information on patterns and rates of forest succession in most of the major forest zones of the Pacific Northwest. The plot network extends from the coast to the Cascades in western Oregon and Washington and east to ponderosa pine forests in the Oregon Cascades. Most of the permanent plots were established during two intervals: from 1910 to 1948. and from 1970 to 1989. The earlier plots were established by U.S. Forest Service researchers to quantify timber growth in young stands of important commercial species and to help answer other applied forestry questions. The more recent period of plot establishment began under the Coniferous Forest Biome program of the International Biological Program during the 1970s. and continued under the Long-term Ecological Research program. A broader set of objectives motivated plot establishment since 1970. especially quantification of composition. structure. and population and ecosystem dynamics of natural forests. Plots have one of three spatial arrangements: (1) contiguous rectangles subjectively placed within an area of homogeneous forest; (2) circular plots subjectively placed within an area of homogeneous forest; and (3) circular plots systematically located on long transects to sample an entire watershed. ridge. or reserve. Rectangular study areas are mostly 1.0 ha or 0.4 ha (1.0 ac) in size (slope-corrected). Circular plots are 0.1 ha (0.247 ac). not corrected for slope. The tree stratum is the focus of work in closed-forest study areas. All trees larger than a minimum diameter (5 cm for most areas) are permanently tagged. Plots are censused every 5 or 6 years. Attributes measured or assessed at each census include tree diameter. tree vigor. and the condition of the crown and stem. The same attributes are recorded for trees (ingrowth) that have exceeded the minimum diameter since the previous census. In many plots tree locations are surveyed to provide a plot-specific x-y location. A mortality assessment is done for trees that have died since the previous census. The assessment characterizes rooting. stem. and crown condition. obvious signs of distress or disturbance. and the apparent predisposing and proximate causes of tree death. ____ Experimental Design - TV010: Description: The sites were selected subjectively to represent modal examples of the major habitat types in the H.J. Andrews area (usually with a mature and old growth example). Some stands (e.g.riparian) were selected for other reasons. The stands are remeasured at 5 to 10 year intervals to provide growth and regeneration information.Field Methods - TV010 : Description: The stands are surveyed into 25 X 25 slope corrected subplots marked with permanent stakes. All trees greater than the minimum size (usually 5 cm dbh) are tagged. diametered. vigor coded. and mapped. The mapping is done using a 5 X 5 m grid formed with string as a guide. See attached sheet for details.GENERAL TAXONOMIC COVERAGE: Tree species of the Western United States. TAXONOMIC SYSTEM: Garrison et al.. 1976 Garrison. G.A.. J.M. Skovlin. C.E. Poulton and A.H.Winward. 1976. Northwest Plant Names and Symbols for Ecosystem Inventory and Analysis (4th ed.). Gen. Tech. Rep. PNW-46. U.S. Department of Agriculture. Forest Service. Pacific Northwest Forest and Range Experiment Station. 267 p.. ( EXTENT: Primarily the Pacific Northwest (OR. WA); additional plots in other western states (CA. WY. CO). ELEVATION_MINIMUM (meters): ELEVATION_MAXIMUM (meters): MEASUREMENT FREQUENCY: 1-6 years PROGRESS DESCRIPTION: Study continues and further data collection is planned UPDATE FREQUENCY DESCRIPTION: Data is updated as needed CURRENTNESS REFERENCE: Ground condition is the range of dates during which the site was visited and data collected. Unit of abundance = IndCountInt, Unit of biomass = NA