Tree improvement effects on tree size distributions forPicea glaucaandPicea marianain New Brunswick, Canada
| Autor: | Yuhui Weng, Michelle Fullarton, K. J. Tosh, Y. S. Park, Dale Simpson |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Scandinavian Journal of Forest Research. 25:10-20 |
| ISSN: | 1651-1891 0282-7581 |
| DOI: | 10.1080/02827580903439782 |
| Popis: | Height and diameter distributions between improved and unimproved (checklot) seedlots for white spruce [Picea glauca (Moench) Voss] and black spruce [Picea mariana (Mill.) BSP] were compared using the two-parameter Weibull function. Individual tree height at age 5–15 years and diameter at breast height at age 15 years that were collected from two series of large-plot realized gain tests were used for this purpose. For both species, improved seedlots did not significantly (α=0.05) change the shape parameter of the distributions relative to their checklots, suggesting that an overall shape value will be adequate to predict tree size distributions of various improved seedlots. The most important finding was that seedlot influenced the scale parameter (related to the range of the distribution) significantly, but from a practical viewpoint, only those scale values of the higher rated seedlots (i.e. seedlots collected from a rogued seed orchard or superior families) were significantly higher (α=0.05) t... |
| Databáze: | OpenAIRE |
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