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Mountain Hemlock
(Tsuga mertensiana)
[Photograph: Susan McDougall @ USDA-NRCS PLANTS Database]
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The Pacific Northwest Tree Ring Database contains time series of radial growth from tree ring research conducted in Oregon and Washington. Users can query the database for particular sites, species, elevation, or start and end years. Data can be viewed on screen or downloaded.
Tree-ring data were gathered on 11 sites for mountain hemlock and 9 sites for subalpine fir. Sampling locations were chosen to represent the range of climatic conditions under which subalpine fir and mountain hemlock occur in this area. At most locations, three sites were selected for tree-ring chronology development that spanned the local elevational range. Increment cores were collected from 9-30 trees at each site, and two cores were taken from each tree. In the lab, tree-rings were dated and measured to produce a ring-width time series for each ring.
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Subalpine Fir
(Abies lasiocarpa)
[Photograph: Susan McDougall @ USDA-NRCS PLANTS Database]
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