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Radiata : an economic breeding objective : the definition of an economic breeding objective for plantation radiata pine grown to produce timber flitch and newsprint and an investigation of some aspects related to short-rotation breeding in general using plantation eucalypts as an example

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Chambers, PGS (2000) Radiata : an economic breeding objective : the definition of an economic breeding objective for plantation radiata pine grown to produce timber flitch and newsprint and an investigation of some aspects related to short-rotation breeding in general using plantation eucalypts as an example. PhD thesis, University of Tasmania.

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Abstract

An economic breeding objective was defined for unpruned radiata pine grown to
produce structural grade timber flitch and high brightness newsprint from
thermomechanical pulp (TMP) in Australia. A production enterprise model was
developed including all sources of income (sale of flitch and newsprint) and costs
(including growing, harvesting, transporting and mill processing components). The
enterprise, as modelled, was shown to be profitable (Profitability Index 19.9%,
assuming a discount rate of 5%). The majority of wood volume was assumed to be
utilised to produce high brightness newsprint (77% by volume), with only 23% used
to produce rough green flitch. The effect of future changes in growth, bark volume,
stem sweep, stem taper, branch quality, timber strength, basic density, tracheid
length, tracheid coarseness and wood brightness (breeding objective traits) on the
profitability of this production enterprise was modelled by defining profit functions
relating each of these traits to the economics of each stage of production.
Sensitivity analysis was employed throughout this process to examine which
assumptions were driving profitability, and identify any that may need verification.
For each trait an economic weight was estimated as the incremental Profitability
Index associated with a unit increa, se in each trait.
Basic density, mean tracheid length and wood brightness were demonstrated as
having a major effect on the production of high brightness newsprint from TMP.
Growth, as expected, had a large impact on the cost of growing a plantation,
however was predicted to be only of moderate to low importance in increasing
enterprise profitbability overall. Branch index was shown to have a major impact
on the profitability of the flitch production line of the enterprise. Bark volume,
stem sweep, stem taper and tracheid coarseness appeared to have a very low
impact on production system profitability. However, the importance of stem sweep
and stem taper as well as branch index and timber strength are likely to become
more important if the enterprise increases its production ratio of flitch to
newsprint.
An investigation into multi-trait selection strategies clearly demonstrated the
dominance of basic density as a selection trait on enterprise profitability. The
assessment of wood and tracheid properties is much more costly than assessment
of growth and form traits. However it was demonstrated that the gains predicted
from individual-tree selections compared with selection based on family-means for
basic density and tracheid length are significant and well worth the additional
associated cost.

Item Type: Thesis (PhD)
Copyright Holders: The Author
Copyright Information:

Copyright 2000 the author- The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

Chapter 4 appears to be the equivalent of a post-print article published as: Chambers P.G.S and Borralho N.M.G (1999), A simple model to examine the impact of changes in wood traits on the costs of thermo-mechanical pulping and high brightness newsprint production with radiata pine, Can. J.For.Res. 29: 161 5- 1626 © 1999 NRC Canada and can be found at 10.1139/x99-127

Chapter 13 appears to be the equivalent of a post-print article published as: Chambers, P.G.S. and Borralho, N.M.G. (1997), Importance of survival in short-rotation tree breeding programs, Canadian Journal of Forest Research 27: 9 1 1-9 17 © 1997 NRC Canada and can be found at 10.1139/x96-215

Date Deposited: 26 Jul 2011 04:08
Last Modified: 11 May 2016 01:07
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