A national survey of supply and present and future prospects for use of Populus species in Canada was conducted by a questionnaire in the fall of 1990. Replies were discussed under primary and secondary industry groups and products. The information was compared with historical data. Conclusions were that poplar usage would continue to grow because of a diminishing supply of accessible softwoods and industry's ability to improve processing technology. Recommendations included using the present survey for periodic updates and the building up and maintenance of a data base of poplar-related publications and research projects across Canada.Un sondage national sur l'approvisionnement et sur les tendances et les perspectives futures quant B l'utilisation des espbces du genre Populus au Canada a kt6 men6 au nom du Conseil du Peuplier du Canada, au cours de l'automne de l'annte 1990. Les rtponses au sondage ont Ct C group6es sous les rubriques d'industries primaires ou secondaires et subdivistes selon le produit manufacturt. L'information et les opinions r e y e s ont t t t compartes aux donntes dtjh existantes. I1 en a Ctt conclu que l'utilisation industrielle du peuplier continuera de s'accroitre parce que les politiques gouvernementales favorisent un utilisation optimale des ressources forestikres et si les industries investissent dans la recherche et le dheloppement technologique.Nous recommendons des mises B jour ptriodiques de ce sondage ainsi que son utilisation comme point de riftrence pour la mise en place d'une banque de d o~t e s contenant I'ensemble des publications et des projets de recherche traitant du peuplier au Canada. Poplar Distribution and Supply Natural StandsThe genus Populus which includes those trees known under the general term "poplar" has wide distribution across Canada. It contains trembling aspen, P. tremuloides, and largetooth aspen, P. grandidentata, balsam poplar, P. balsamifera and the cottonwoods, eastern cottonwood, P. deltoides and black cottonwood P. trichoca~pa. All these species are deciduous, fast growing with a relatively short life span, are moisture loving, generally intolerant of shade, and are medium to large trees. Vegetative propagation, mainly from the roots but also from the stump, is characteristic of the poplars.Trembling aspen comprises over 80% of the total merchantable poplar standing timber and has a volume estimated at 1,857 million m3. It is also by far the most widely distributed and utilized species and is the main subject of this survey. It is known as a "pioneer species" since it is one of the first to appear after a stand disturbance such as fire, insect, disease or by clearcutting. Aspen's wide distribution, ease of establishment either vegetatively or by seed, its fast growing ability and its light soft wood might suggest that it would be highly prized by forest managers. In fact, until very recently, the situation was the reverse. Poplar was regarded as a weed tree, and the objective of most silviculturalists was to take measures to eradicate it, usually ...
Aspen poplar, although widely distributed over the northern half of North America, is greatly underutilized. However, because of its ease of reestablishment through vegetative reproduction, its short rotation management on appropriate sites and new technological development favouring such uses as chemimechanical pulp and waferboard, the forest industry will probably pay more attention to it in the future. Regional differences throughout its range are discussed for Ontario, the Prairie Provinces and the U.S. Lake States.
During the summer months, dead and weakened trees and logs left in the woods are subject to attack by a variety of insects, mainly of the order Coleoptera. Some are wood-boring forms which cause a depreciation in the potential value of the lumber; others are barkbeetles which at times may build up in numbers sufficient to cause a primary attack on the living stand.
Urban forestry is defined, and the role that it plays in providing amenity and community benefits to urban life is discussed. Since 1982, the city of North York has promoted community involvement in creating natural areas in its parks and greenbelts. Three examples of this program are given.
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