The estimation and significance of sapwood basal area in young Douglas-fir stands Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/f4752m70w

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  • The relationship of sapwood basal area to basal area was examined on stands of young-growth Douglas-fir. Through non-destructive sampling, sapwood basal area was quantified on four different thinning intensities and one control (unthinned) treatment. Emphasis was on testing a sampling method and evaluating variations in the sapwood component as a result of thinning. The study site was in the western Oregon Coast Range near Hoskins, Oregon. Permanent research plots had been established with a calibration thinning in 1963. The area continues to be part of the cooperative levels-of-growing-stock studies in the Pacific Northwest. Sapwood basal area was estimated from increment cores taken on trees selected for sampling. Probability of selection was proportional to basal area. Estimates of sapwood basal area by tree were expanded to a per plot and per acre basis. Regression analysis of sapwood basal area on basal area was completed. Results indicated that the use of a systematic variable-probability sampling method provided an excellent estimate of sapwood basal area. Other analyses showed that bark thickness ratio, basal area inside bark to basal area outside bark, varied with thinning intensity; an adequate sapwood estimate could be achieved using one core per tree; and that the sapwood basal area measurement closest to the mean was from the side of the tree aligned with the prevailing winds. Also, the sapwood basal area to basal area relationship changed with thinning intensity. This suggested that growth on heavily thinned plots was on a different exponential growth curve, with similar slope but different intercept, than growth on less heavily thinned plots.
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