Graduate Thesis Or Dissertation
 

Impact of Climate and Disturbance on the Formation of Earlywood and Latewood in Douglas-fir at the Salal Fields Study Site

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/jm214s14x

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  • Wood density is controlled to a large extent by the relative widths of earlywood and latewood in the stem, but the mechanisms controlling these amounts are poorly understood in coastal Douglas-fir. To understand the role of climatic factors, one hundred and thirty-six increment cores were collected and measured from the Salal Fields study site located in Western Oregon. Increment cores were collected from the four following heights on 38 Douglas-fir trees representing differing social positions: 1.37, 2.44, 4.88, and 7.01 m. A master chronology was constructed using the median earlywood and latewood time series for all of the increment cores collected. Statistical models indicated that earlywood growth was impacted most by temperature, while latewood growth was impacted most by the amount of summer precipitation. The site experienced disturbance events, which impacted earlywood growth in 1980 and latewood growth in 1983. The majority of variation in the master chronologies of both earlywood and latewood for this site can be explained by changes in climate and the presence of disturbance events.
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