Canadian Forest Service Publications
Best white spruce provenances in Ontario. (Les meilleures provenances d’épinette blanche en Ontario). 1999. Morgenstern, E.K.; Copis, P. Natural Resources Canada, Canadian Forest Service, Headquarters, Science Branch, Ottawa. Information Report ST-X-16. 34 p.
Issued by: National Capital Region
Catalog ID: 10470
Language: English / French
Availability: PDF (download)
Height and survival of selected provenances in 20 field experiments in Ontario with about 300 provenances are reported. The experiments consist of three series initiated with seed collections between 1953 and 1972, which sample different parts of the range of the species. Tree age from seed at the time of measurement was 20-38 years in the oldest series, 31-33 years in the intermediate series, and 10-18 years in the youngest series. In each series, 5-15 of the tallest provenances identified during previous measurements and 2-5 of the shortest provenances were measured. The results show that very few substantial changes in rank occurred after age 20. Further, the good performance of limestone-origin provenances on a limestone site has persisted. The distribution of the experiments across seven site regions in Ontario permitted a listing of the tallest provenances and of their survival in each of these regions. Good performance of local provenances is not rare, but non-local provenances moved 2-4 degrees of latitude northward more often outperformed local provenances by about 10% in height. The best experiments should be protected and maintained, particularly those in the most recently established series. The value of these experiments in studying the effects of climatic change is mentioned. The presence of vigorous populations in the relatively densely settled counties of southern Ontario is a valid reason for measures of genetic conservation.