Canadian Forest Service Publications
Performance and morphological response of the hybrid poplar DN-74 (Populus deltoides x nigra) under different spacings on a 4-year rotation. 1999. Larocque, G.R. Annals of Forest Science 56(4): 275-287.
Available from: Laurentian Forestry Centre
Catalog ID: 16823
CFS Availability: PDF (request by e-mail)
The effect of competition on the performance and morphological response of the hybrid poplar DN-74 (Populus deltoides x nigra) was examined by varying stand density from 4 444 stems ha-1 to 40 000 stems ha-1. The root collar diameter growth of individual trees was inversely related to the intensity of competition, as there was nearly a two-fold decrease in root collar diameter from the largest to the closest density after only four growing seasons. Crown width, crown ratio, leaf biomass and leaf area decreased significantly with an increase in density. However, crown shape ratio, leaf area projection and leaf area ratio did not vary significantly with stand density, and specific leaf area decreased with the degree of crown closure and crown depth, which indicated that this hybrid shows a high degree of placticity in response to competition. Nutrient contents of foliage and stems did not vary much with the intensity of competition.
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