DETERMINATION OF INCREMENT OF TREES BY STEM ANALYSIS. 239 



DETERMINATION OF the INCREMENT OF TREES 



by STEM ANALYSIS. 



I. Eucalyptus viminalis Labill. 



By W. A. W. de Beuzeville. 



[Read before the Royal Society of N. 8. Wales, December 3, 1919.~] 



This paper is proposed to be the first of a series dealing 

 with the increment of various forest trees of New South 

 Wales. The rate of growth or increment may be ascer- 

 tained either by systematic measurement of standing trees 

 or by making what is known as a stem analysis of felled 

 trees. Stem analysis can be applied only to those species 

 the timber of which shows well defined rings of growth, 

 and for this reason, unfortunately, is not applicable to 

 many Australian species. Where possible the method 

 should be used, as it enables the forester to obtain valuable 

 data while waiting for the more accurate information 

 secured from the direct measurement of trees. My stem 

 analysis of E. gigantea Hook, has already been published 

 by the Forestry Commission, N.S.W. in their Bulletin No. 13. 



The specimen of E. viminalis selected for analysis was 

 an average tree growing within the Bago State Forest on 

 the southern tableland. The tree carried a good crown 

 occupying a little less than half the total height. It was 

 felled at ground level, and the main stem marked off into 

 seven pieces each of which was cut through the centre. 

 The concentric rings on each section were counted, and the 

 diameters measured, the information being then tabulated, 

 and the calculations made on the assumption that the con- 

 centric rings were annual. 



Details of the Analysis. 

 Section I taken at the foot of the tree showed 66 rings 

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