scholarly journals Long-term effects of leader browsing by deer on the growth of Sitka spruce (Picea sitchensis)

2009 ◽  
Vol 82 (4) ◽  
pp. 387-401 ◽  
Author(s):  
D. Scott ◽  
D. Welch ◽  
D. A. Elston
Keyword(s):  
Sitka Spruce ◽  
Picea Sitchensis ◽  
Long Term Effects

Heritability of height growth in 10-year-old Sitka spruce

1985 ◽  
Vol 27 (6) ◽  
pp. 729-734 ◽  
Author(s):  
Francis C. Yeh ◽  
Sven Rasmussen
Keyword(s):  
Sitka Spruce ◽  
Height Growth ◽  
Picea Sitchensis ◽  
Breeding Program ◽  
Progeny Test ◽  
Northwest Coast ◽  
Phenotypic Variance ◽  
Family Selection ◽  
Sources Of Variation

Ten-year height growth for Picea sitchensis (Bong.) Carr. was studied in a progeny test of 42 wind-pollinated families from seven stands on the northwest coast of Vancouver Island. Although stand and family-within-stand effects were significant sources of variation, 79% of the phenotypic variance in 10-year height was associated with differences among trees within family plots. Estimates of heritability ([Formula: see text], [Formula: see text], and [Formula: see text]) indicate that a combination of stand, family-within-stand, and progeny-within-family selection will be effective for a long-term breeding program to increase tree heights in Sitka spruce.Key words: Picea, heritability, quantitative.

Wind-driven gap development in Birkley Wood, a long-term retention of planted Sitka spruce in upland Britain

2007 ◽  
Vol 37 (10) ◽  
pp. 1787-1796 ◽  
Author(s):  
C.P. Quine ◽  
D. C. Malcolm
Keyword(s):  
Wind Speed ◽  
Stand Structure ◽  
Sitka Spruce ◽  
Picea Sitchensis ◽  
Stand Development ◽  
Gap Formation ◽  
Planted Forests ◽  
Seed Sources ◽  
Strong Winds

Management of planted forests in Britain is changing to incorporate biodiversity and other nontimber values by lengthening rotations, seeking alternatives to clear-felling, and identifying stands for nonintervention. However, there are particular uncertainties over stand development of exotic species on areas of high windthrow hazard. This study considered the effect of strong winds between 1987 and 2000 on stand development of Sitka spruce ( Picea sitchensis (Bong.) Carrière) planted in 1923. Windthrown gap area increased eightfold through at least 38 separate events. Windthrow of trees assessed as stable occurred during periods of higher wind speed than those with windthrow of trees assessed as vulnerable, and there was a nonlinear relationship between wind speed and increase in gap area. Gap expansion contributed more to the increase in gap area than new gap formation, and the centre of the largest gap migrated downwind. Nevertheless, a substantial proportion of the stand remains undisturbed to an extent not predicted. Therefore, a complex stand structure may develop, including a partial wave of natural regeneration of Sitka spruce in the expanding gaps, but species diversification will be slow due to the absence of local seed sources. The results provide insights for stand dynamics in windy, maritime environments.

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