Growth of Clumped vs. Equally Spaced Trees

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Abstract
Fifteen-year results are presented for a thinning experiment made in 13-year-old red pine (Pinus resinosa Ait.), designed to compare growth of trees in 4-tree clumps with that of uniformly spaced trees, in both cases growing at 890 stems/ha. By the end of the period, average crown size, form class and height were about the same for both stands, but growth by trees in clumps had been less for dbh and for basal area and total volume per hectare. Clumped trees had a significant tendency to lean away from each other. It was concluded that control of inter-tree spacing at planting or thinning is justified to the extent that clumps of more than three adjacent trees be avoided.

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