Building deployment portfolios for genotypes under performance instability

Apiolaza, Luis A.; Alzamora, Rosa M.

doi:10.14214/sf.901

Cited by 5 publications

(5 citation statements)

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“…Data consisted of three groups of 34 trees grown to produce appearance lumber, structural lumber, or both, in total 102 trees presented by Apiolaza and Alzamora (2013). Appearance grades correspond to products described by WWPA (1995); whereas the structural study considered New Zealand grades 6, 8, 10 and 12, where the number represents MoE in GPa.…”

Section: Methodsmentioning

confidence: 99%

“…Finally, a third group of appearance-structural trees produced appearance grades from the first pruned log, and structural lumber from two upper unpruned logs. For more detail, see Apiolaza and Alzamora (2013).…”

Section: Methodsmentioning

confidence: 99%

“…There are a few key wood traits that explain most of the log recovery value; see Apiolaza and Alzamora (2013) for a full description. Volume is the most important trait for appearance lumber, although resin defects also affect the recovery value of clear grades.…”

Section: Introductionmentioning

confidence: 99%

“…Variability for these traits generates risk for recovery value. Apiolaza and Alzamora (2013) pointed out that tree selection for deployment could be seen as an investment decision when considering expected profits and variability. They proposed using portfolio theory relying on the mean absolute deviation, MAD (Konno and Yamazaki 1991), for the analysis of return-risk tradeoffs for trees as a result of wood traits variability to build 'deployment portfolios'.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Using Conditional Value at Risk (CVaR) to select radiata pine trees for operational deployment

Pinto¹,

Alzamora²,

Apiolaza

2015

Bosque (Valdivia)

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Using Conditional Value at Risk (CVaR) to select radiata pine trees for operational deployment

Pinto¹,

Alzamora²,

Apiolaza

2015

Bosque (Valdivia)

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“…Pulpwood quality and value are mainly related to pulp yield, wood density, and fibre length. These traits are under genetic control and are influenced by silviculture and processing technology (Zobel & Buijtenen 1989;Mead 2013;Apiolaza & Alzamora 2013).…”

Section: Introductionmentioning

confidence: 99%

Peeler core and slabwood fibre properties for Pinus radiata D.Don pulp production

Elissetche,

Apiolaza,

Alzamora

et al. 2024

NZJFS

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Background: Pulp production based on Pinus radiata D.Don is constantly improving the value recovery of logs. One example is using the peeler cores and slabwood derived from sawing and peeling processes to produce pulp. However, these two raw materials have not been characterised for their fibre properties. Methods: We report on four wood fibre quality attributes derived from peeler cores and slabwood, directly influencing pulp quality and pulping process: fibre length (mm), fibre width (µm), fines content (%), and coarseness (µg/m). This pilot study sampled two P. radiata stands grown on different sites and early silvicultural regimes in the Araucanía Region of Chile. Analysis of wood fibre consisted of three trees per stand, and six discs per tree: two at the bottom, two at breast height (1.3 m), and the last two at 5.23 m height. Results: The trajectory of mean annual increment in diameter at breast height (MAI) and periodic annual increment in diameter at breast height (PAI) for trees in the two stands aligned with their respective site qualities and silvicultural regimes. In Stand 1, with a site index of 36, and Stand 2, with a site index of 31, the average proportions of juvenile wood (measured at 1.3 m) were 50% and 53%, respectively. Thus, despite weed control and fertiliser application in Stand 1, there was no increase observed in the proportion of juvenile wood. There were significant differences in fibre properties between peeler core and slabwood, and these differences were present across the range of tree heights and diameters (p<0.05). While there were no statistically significant differences among disc positions, significant distinctions emerged between stands and wood types. The interaction between these factors was also found to be statistically significant (p<0.05). Conclusions: Our study suggests that adding these two materials into the mix for producing pulp would have positive implications due to pulp from peeler core is more suitable for printing and writing grades and addition of mature wood from slabwood, could improve strength properties of paper manufacture. However, it is necessary to test the optimal proportion for the final mix.

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Linking changes to breeding objectives and genetic evaluation to genetic gain in New Zealand

Apiolaza

2014

New Forests

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Building deployment portfolios for genotypes under performance instability

Abstract: Building deployment portfolios for genotypes under performance instability Apiolaza L.A., Alzamora R.M. (2013). Building deployment portfolios for genotypes under performance instability. Silva Fennica vol. 47 no. 1 article id 901. 18 p.

Cited by 5 publications

References 53 publications

Using Conditional Value at Risk (CVaR) to select radiata pine trees for operational deployment

Using Conditional Value at Risk (CVaR) to select radiata pine trees for operational deployment

Peeler core and slabwood fibre properties for Pinus radiata D.Don pulp production

Linking changes to breeding objectives and genetic evaluation to genetic gain in New Zealand

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