The Silvicultural Significance of Geographic Variation in the White Engelmann Spruce Complex in British Columbia

Roche, Laurence

doi:10.5558/tfc46116-2

Cited by 4 publications

(7 citation statements)

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“…in British Columbia where their ranges overlap along the Skeena and Nass River basins and along valley bottoms (Roche 1966(Roche , 1968a(Roche , 1969a. The cone morphology of the whiteSitka hybrid is very similar to that of pure Engelmann spruce; this may explain a reported occurrence (Garman 1957) of Engelmann spruce in the Slteena valley (Roche 1969a). Daubenmire ( 1 968) found that the hybrid in this region is between white and Sitlta and not white and Engelmann.…”

Section: Genetic Variationmentioning

confidence: 83%

“…In Br~tish Columbia, south of latitude 52'00; there are small, vigorous introgressed populations (Roche 1969b), and one, the Birch Island provenance (latitude 51 '37'; elevation 400 ft.) has grown vigorously in Eastern Canada and Norway, far from its origin. Evolution has also resulted in genetic differentiation of races across the species range.…”

Section: Genetic Variationmentioning

confidence: 99%

“…White and Engelmann spruce are the extreme forms of a clinal pattern of variation, and where they occur syrnpatrically, no major discrete morphological, physiological or chemotaxanomic differences between them has yet been determined (Roche 1969a in the white-Engelmann complex in the broad transitional zone between the Montane and Subalpine forest regions is the result of this hybridization followed by natural selection within the hybrid swarms. (Fig.…”

Section: Genetic Variationmentioning

confidence: 99%

“…Temperature, photoperiod and winter chilling are the principal environmental factors influencing these characteristics in white and Engelmann spruce (Vaartaja 1959, Nienstaedt 1967, Roche 1969a). Nienstaedt and I<ing (1969), who estimated heritability of time of flushing in white spruce, have suggested the possibility of simultaneous selection for late flushing and rapid growth rate in this species.…”

Section: Genetic Variationmentioning

confidence: 99%

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Genetic Variation and Its Exploitation in White and Engelmann Spruce

Roche¹,

Holst²,

Teich³

1969

The Forestry Chronicle

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Section: Genetic Variationmentioning

confidence: 83%

Section: Genetic Variationmentioning

confidence: 99%

Section: Genetic Variationmentioning

confidence: 99%

Section: Genetic Variationmentioning

confidence: 99%

See 2 more Smart Citations

Genetic Variation and Its Exploitation in White and Engelmann Spruce

Roche¹,

Holst²,

Teich³

1969

The Forestry Chronicle

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“…To produce the required physiological grades of seedlings nurseries should be in specific I'ocalities (Stone 1967 Figure 3. Regressions of percent of 2-year-old, dormant white-Engelmann spruce seedlings on altitude of origin in two nurseries in British Columbia (based on data in Table 5 given by Roche 1970). Interest here is centered on the effect of nurseries rather than that of altitude.…”

Section: Implications For Nursery Location and Usementioning

confidence: 99%

The Seed Source-Environment Interaction: A Factor in Nursery Management

Morgenstern¹

1976

The Forestry Chronicle

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The physiological condition of planting stock is an important criterion in plantation establishment and is related to seed origin, nursery or greenhouse environment, and conditions of storage and shipment. For the benefit of silvicultural planners and nurserymen, the genetic effects of seed origin are reviewed. Generally, seed sources from low latitudes and altitudes respond more slowly to warming temperatures in spring and declining length of day in autumn than sources from high latitudes and altitudes. If several sources are grown in the same nursery, there may be variation in phenology of root and shoot growth depending upon the distance of displacement from the place of seed origin to the nursery site. Such variation must be taken into account when plants are lifted, transplanted, fertilized and shipped, to apply treatments with maximum effect and attain a high percentage of field survival and rate of growth. Similarly, the temperature and day length requirements of different seed sources must be considered when designing optimum environments for container production. Displacement effects are not necessarily disadvantageous and have been beneficial in some cases, for example, when southern provenances were grown in northern nurseries with long days and mild fall climates. These effects should also be considered in the location of new nurseries.On doit serieusement tenir compte de la condition physiologique des semis lorsque I'on etablit une plantation.Cette condition est reliee a I'origine des graines, au milieu dans lequel se trouvait la pepinikre ou la serre, et aux conditions d'entreposage et de livraison. L'auteur decrit les effets genetiques de I'origine de graines, en vue d'aider les sylviculteurs et les pepinieristes. Sous les climats nordiques, la differentiation genetique des populations par rapport a la selection naturelle selon les temperatures et les photoperiodes se revele particulierement prononcee. De facon generale, les provenances des basses latitudes e t altitudes reagissent plus lentement que celles des hautes latitudes et altitudes vis-i-vis le rechauffement des temperatures au printemps et le raccourcissement des jours en automne. Si on fait pousser plusieurs provenances dans la mdme pepiniere, on pourrait constater de la variation dans la phenologie de la croissance des racines et des pousses selon la distance qui separe la pepiniere du lieu d'origine des graines. On doit tenir compte d'une telle variation lorsque les semis sont dechauss6s, transplantes, fer tilises et livres, en vue de les traiter le plus effectivement possible et d'atteindre un grand pourcentage de survie e t de taux de croissance sur le terrain. Dans le m6me ordre d'idee, on doit tenir compte des besoins des differentes provenances concernant la temperature et la longueur du jour pour choisir le milieu optimal de production de semis en potets. Les effets du deplacement ne sont pas necessairement mauvais; dans certains cas, ils furent bons, par exemple lorsque I'on f i t pousser des provenances meridionales da...

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Sitka spruce (Picea sitchensis) in North America with special reference to its role in British forestry

Roche¹,

Haddock

1987

Proc., Sect. B Biol. sci.

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SynopsisThe natural distribution of Sitka spruce is examined in relation to the species' role in British forestry. Particular attention is therefore given to a description of habitats on the Queen Charlotte Islands, and also on the adjacent mainland of British Columbia where Sitka spruce is sympatric with white spruce (Picea glauca) and hybridisation occurs. Examples of genetic variation are given and it is suggested that a knowledge of the genecologv of the species in its natural habitat would help to elucidate its full ecological and genetic potential in Britain.

show abstract

The Silvicultural Significance of Geographic Variation in the White Engelmann Spruce Complex in British Columbia

Cited by 4 publications

References 0 publications

Genetic Variation and Its Exploitation in White and Engelmann Spruce

Genetic Variation and Its Exploitation in White and Engelmann Spruce

The Seed Source-Environment Interaction: A Factor in Nursery Management

Sitka spruce (Picea sitchensis) in North America with special reference to its role in British forestry

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