IntensIve sIlvIculture - Forest Science Labs - Research Network ...
IntensIve sIlvIculture - Forest Science Labs - Research Network ...
IntensIve sIlvIculture - Forest Science Labs - Research Network ...
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14.5, 7.8, and 5.5 t/ha for the high-, medium-, and low-density plots, respectively. Growth<br />
efficiency, after dropping sharply between leaf area indexes (LAI) of 1 and 6 msuperscript<br />
2/msuperscript 2, remained relatively constant up to the highest measured LAI of 17.<br />
Consequently, above-ground biomass increment continued to increase at LAIs well above that at<br />
which the Beer-Lambert law predicts maximum light should be absorbed. Foliage analyses<br />
indicated that thinning improved N, K and Mg nutrition and increased the translocation of K from<br />
1-yr-old foliage to support new growth. However, fertilizer application increased foliar N and P<br />
contents only when coupled with pruning, suggesting that trees favour total leaf area over<br />
individual needle nutrition. Indications of K and Mg limitations in this study are supported by<br />
other recent studies of Douglas fir.<br />
635. Vihnanek, R.E. 1987. The effects of prescribed burning on the growth and nutrition of young<br />
Douglas-fir plantations in some salal [Gaultheria shallon]-dominated ecosystems [in British<br />
Columbia, Canada]. <strong>Forest</strong>ry-Abstracts 48(11): 641.<br />
Keywords: site preparation<br />
prescribed fire<br />
growth<br />
tree physiology<br />
636. Vihnanek, R.E. and T.M. Ballard. 1988. Slashburning effects on stocking, growth, and nutrition<br />
of young Douglas-fir plantations in salal-dominated ecosystems of eastern Vancouver Island.<br />
Canadian-Journal-of-<strong>Forest</strong>-<strong>Research</strong> 18(6): 718-722.<br />
Keywords: site preparation<br />
prescribed fire<br />
growth<br />
tree physiology<br />
stand conditions<br />
Abstract: Stocking, ht. growth, basal diam. growth, and foliar nutrient concn. of 5- to 15yr-old<br />
Douglas fir (Pseudotsuga menziesii) were evaluated on burned and unburned areas within<br />
each of 20 sites on eastern Vancouver Island, which were characterized by ecosystems dominated<br />
by salal (Gaultheria shallon). Burning significantly reduced salal ht. and cover and significantly<br />
increased Douglas fir stocking, ht. growth, basal diam. and foliar P, K, Ca, Fe, and B concn.<br />
Foliar concn. of N, Mg, S, Zn and Cu were not significantly affected. Foliar Mn concn. were<br />
significantly reduced but remained very far above the deficiency threshold.<br />
637. Vogt, K.A., D.J. Vogt, E.E. Moore, W. Littke, C.C. Grier and L. Leney. 1985. Estimating<br />
Douglas-fir fine root biomass and production from living bark and starch. Canadian-Journal-of-<br />
<strong>Forest</strong>-<strong>Research</strong> 15(1): 177-179.<br />
Keywords: fertilization<br />
tree morphology<br />
tree physiology<br />
Abstract: A potential indirect technique for determining fine root biomass and production<br />
is reported. Data from 4 permanent Douglas fir plots in Washington State given different fertilizer<br />
treatments showed a direct correlation between the starch content of a 1-cm wide band of living<br />
bark at b.h. per hectare and fine root biomass per hectare (rsuperscript 2 = 0.85). Starch content<br />
was determined in bark samples from 5 trees in each plot and estimates of the volume of 1-cm
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