Forests 2013, 4(2), 251-269; doi:10.3390/f4020251
Article

Specific Gravity of Hybrid Poplars in the North-Central Region, USA: Within-Tree Variability and Site × Genotype Effects

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Received: 18 March 2013; in revised form: 3 April 2013 / Accepted: 11 April 2013 / Published: 23 April 2013
(This article belongs to the Special Issue Improving Wood Quality from Planted Forests)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Specific gravity is an important consideration for traditional uses of hybrid poplars for pulp and solid wood products, as well as for biofuels and bioenergy production. While specific gravity has been shown to be under strong genetic control and subject to within-tree variability, the role of genotype × environment interactions is poorly understood. Most specific gravity reports are for a limited number of locations, resulting in a lack of information about the interactions between clones and sites over a wide range of climate and soil conditions. The objective of the current study was to characterize the effects of bole position, site, clone, and site × clone interactions for twelve hybrid poplar genotypes grown in Iowa, Minnesota, Wisconsin, and Michigan, USA. Observed specific gravities ranged from 0.267 to 0.495 (mean = 0.352 ± 0.001 for 612 samples taken from 204 trees), with bole position and site × clone interactions having significant effects on specific gravity. Further investigation of the site × clone interactions indicated that environmental conditions related to water stress were key predictors of specific gravity. These data are important for informing genotypic selection and silvicultural management decisions associated with growing hybrid poplars.
Keywords: biomass; bole position; clones; correlation; feedstock quality; Populus; short rotation woody crops; tree growth; water stress; wood density
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MDPI and ACS Style

Headlee, W.L.; Jr., R.S.Z.; Hall, R.B.; Bauer, E.O.; Bender, B.; Birr, B.A.; Miller, R.O.; Randall, J.A.; Wiese, A.H. Specific Gravity of Hybrid Poplars in the North-Central Region, USA: Within-Tree Variability and Site × Genotype Effects. Forests 2013, 4, 251-269.

AMA Style

Headlee WL, Jr. RSZ, Hall RB, Bauer EO, Bender B, Birr BA, Miller RO, Randall JA, Wiese AH. Specific Gravity of Hybrid Poplars in the North-Central Region, USA: Within-Tree Variability and Site × Genotype Effects. Forests. 2013; 4(2):251-269.

Chicago/Turabian Style

Headlee, William L.; Jr., Ronald S.Z.; Hall, Richard B.; Bauer, Edmund O.; Bender, Bradford; Birr, Bruce A.; Miller, Raymond O.; Randall, Jesse A.; Wiese, Adam H. 2013. "Specific Gravity of Hybrid Poplars in the North-Central Region, USA: Within-Tree Variability and Site × Genotype Effects." Forests 4, no. 2: 251-269.

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