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Forestry 1953 26(1):33-36; doi:10.1093/forestry/26.1.33
© 1953 by Institute of Chartered Foresters
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VARIATION OF DENSITY IN STEMS OF DOUGLAS FIR

L. CHALK

Imperial Forestry Institute Oxford

In a disk from the stem of a very fast-grown Douglas fir (Pseudotsuga taxifolia Brit.), 19 years old, with an almost constant ring-width of about 1/3 inch, the density of the individual rings was almost constant from pith to bark and there was no sign of any increase outwards such as was found by Turnbull in fast-grown South African pines. Similar results were also obtained with more closely grown material (mean ring-width about 1 1/0 inch). There appeared to be no general relation between density and ring-width, but the highest densities occurred in rings less than 6 mm. wide in the centre of the fast-grown tree and at the outside of a tree with access to river water.


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