Abstract
Annual pattern of relative growth rate (RGR) and stem extension growth were examined in four 1-year-old conifer species grown at two nurseries. Net assimilation rate (NAR) and needle area ratio (F) were calculated for a 14-day period in June. Seasonal patterns of RGR in Douglas fir and Sitka spruce were similar, but RGR of white spruce was lower and showed a different pattern. Seasonal fluctuations in RGR may have been associated with changes in rate of stem extension growth in Douglas fir and Sitka spruce, but not in white spruce or hemlock. Differences in NAR had a greater effect on RGR than differences in F during June. In particular, low RGR was mainly due to low NAR in white spruce.
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