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interaction between drought and N treatment and a small response in both survival and dry weight
to K application. Root growth capacity, measured at the time of planting, showed an approximate
doubling in all species due to high N treatment, and was also increased in white spruce by
drought stress. Survival and root growth capacity were poorly correlated, but dry-weight growth
in sand beds was well correlated with root growth capacity. Shoot dry weight and percentage N in
shoots measured after nursery growth were correlated with root growth capacity. Manipulation of
root growth capacity by changing nursery treatment was possible without altering resistance to
drought stress after planting.
155. Duke, K.M., G.M. Townsend and W.A. White. 1989. An economic analysis of and thinning
effects on Douglas-fir stands at Shawnigan Lake. Canadian-Forest-Service, Pacific and Yukon
Region Information-Report BC-X-312. v + 19 p.
Keywords: fertilization
thinning
economics
computer modeling
Abstract: A single-tree density-dependent growth model was used to project, from age 24
to age 120 yr, 9 combinations of thinning and fertilizer application (nitrogen as urea or
ammonium nitrate) in Douglas fir (Pseudotsuga menziesii) near Shawnigan Lake, British
Columbia. Costs and benefits were estimated as a function of stand diameter, and forestry
investment criteria were used to evaluate each treatment on both an incremental and a regime
basis. The effect of rising real prices, and the treatment of silvicultural costs as an initial
investment or as a harvest cost were also studied.
156. Dunsworth, B.G. 1985. Three-yr survival and height growth of 2+0 bareroot Douglas-fir
seedlings treated with a Symbex root dip. Tree-Planters' Notes 36(1): 24-25.
Keywords: nursery operations
nursery fertilization
growth
tree/stand health
Abstract: Seedling roots were dipped in a sol. of Symbex [a stimulant containing fertilizer
and microorganisms?] diluted 40:1 with water, or water before planting out in May 1980 on
Vancouver Island, British Columbia. Although the ht. growth of Symbex-treated trees was
significantly greater in 1981, there were n.s.d. in total ht., ht. growth or survival after 3 growing
seasons.
157. Dunsworth, B.G. 1988. Douglas-fir fall root phenology: a bioassay approach to defining planting
windows. In Proceedings: 10th North American Forest Biology Workshop, 'Physiology and
genetics of reforestation', University of British Columbia, Vancouver, British Columbia, July 10-
22, 1988. Eds. J. Worrall, J. Loo-Dinkins and D.P. Lester. pp. 295-307.
Keywords: planting operations
growth
tree/stand health
tree phenology