Growth and yield 35 years after commercially thinning 50-year-old Douglas-fir
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Growth and yield 35 years after commercially thinning 50-year-old Douglas-fir by Stephen A. Y. Omule

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Published by Economic & Regional Development Agreement, Ministry of Forests and Lands in Victoria, B.C .
Written in English

Book details:

Edition Notes

Statementby S.A.Y. Omule.
SeriesFRDA report,, 021
LC ClassificationsMLCM 92/02503 (S)
The Physical Object
Paginationvi, 15 p. :
Number of Pages15
ID Numbers
Open LibraryOL2236968M
LC Control Number89106959

Download Growth and yield 35 years after commercially thinning 50-year-old Douglas-fir


than the projected yield of a managed Douglas-fir plantation of the same age. In contrast to volume, quadratic-mean stand diameter of the two species was nearly the same (table 2). Noble fir, however, had slower early height growth than the Douglas-fir. At breast height age 5 years, noble fir top height was feet compared with anCited by: 2. Growth and yield tables -- Terms used Tables of normal yield— FIGURE 1.—Area In Oregon and Washington included in the Douglas fir yield study. Each solid dot represents a Douglas fir forest in which several (usually about 10) of Douglas fir now 60 to 80 years old in the Willamette Valley andCited by: In general, shrub cover increased after thinning, while forb cover increased initially after thinning and then declined. Though spraying effects were still visible 15 years after treatment driven by reductions in one dominant understory species, it had little effect on the long-term development of structure at these overstory by: 5. Youbou. It comprises 50 acres of fairly uniform well-stocked year- old Douglas fir with 10 per cent hemlock, cedar, balsam fir, and maple. The present second-growth stand originated from natural reproduction after clear felling of the virgin timber in , and the stand has been.

  Douglas-fir in the landscape browning from Rhabdocline needlecast. These needle cast diseases can be infecting your trees for up to three years before you notice any symptoms; but whether it is the stress of winter, other stresses or a combination of events, we have seen this disease express its fruiting bodies with symptoms exploding on trees. stand volumes given current growth rates. Mean annual increment (MAI) This is the average volume growth per year over the life of the stand. Periodic annual increment (PAI) This is the annual volume growth measured over a specified period, usually 5 or 10 years. We recommend you use the growth over the past 5 years to calculate PAI. The Douglas fir (Pseudotsuga menisci) is an ornamental tree that is also widely utilized as a Christmas tree. It claims a medium rate of growth; a medium growth rate, according to the Arbor Day Foundation, signifies a tree that grows between 13 and 24 inches in height annually. Abundance of natural regeneration and growth comparisons with planted seedlings 10–13 years after commercial thinning in year-old Douglas-fir, Douglas-fir.

After 5 years, the 35 and 50% cuttings limited growth and survival of suckers (1 m high), but the 65 and % cuttings favoured their development ( and .   The parameter estimates were consistent with biological expectations; that is, they were of the correct sign and approximate magnitude ().Diameter growth was a peaking function over initial diameter, increased with crown ratio and site index, and decreased with basal area in larger trees and stand basal area ().For a site index of m and a basal area of 10 m 2 ha −1, diameter growth. Multiply the diameter in inches by the appropriate growth factor to determine the estimated age of your tree. Let's use the white oak, for example. It has a growth factor of 5. If our white oak has a diameter of 22 inches, we'd multiply that by 5 to get an estimated age of years (d iameter in inches x growth factor = tree age). than that of young-growth Douglas-fir stands that are regener-ated after logging. Curtis and Marshall () reported ≥ trees/ha in to year-old stands that regenerated naturally following logging. Six stands ranging from age 50 to 60 years had an average of .