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Forestry 1958 31(2):113-120; doi:10.1093/forestry/31.2.113
© 1958 by Institute of Chartered Foresters
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THE EFFECT OF RATE OF GROWTH (RING WIDTH) ON THE DENSITY OF SOFTWOODS*

B. J. RENDLE and E. W. J. PHILLIPS

Forest Products Research Laboratory Princes Risborough

The relation between rate of growth and density has been examined in fairly wide-ringed Douglas fir (Pseudotsugo taxifolia) and Corsican pine (Pinus nigra var. calabrica) grown in the south of England. A comparison between wood formed early in the life of the tree and wood of similar ring width formed later has shown that the latter is invariably denser, indicating that the higher density of older wood is due to an age effect rather than to diminishing ring width. It is concluded that after a certain age rapid growth can produce wood of reasonably high density. This confirms that Turnbull's findings on widely spaced exotic softwoods grown in South Africa apply, with reservations, to trees grown in this country under conditions where rapid growth can be maintained.


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