Terms - Silvicultural Terms in Canada
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underbrush [sous-bois (n.m.)]
Shrubby vegetation and stands of tree species that do not produce commercial timber. (3)

 

undercutting [cernage (n.m.)]
Root-pruning of nursery stock in situ, particularly by horizontal cut. (3)

 

undergrowth [sous-bois (n.m.)]
A general term usually comprising both the herbaceous cover and the lower shrubs, and even the lowest trees, under a forest canopy. (3)

 

underplant [plant de sous-étage (n.m.)]
Young trees used for underplanting. (3)

 

underplanting [plantation en sous-étage (n.f.)]
Planting young trees under the canopy of an existing stand.

 

understocking [de densité relative déficiente (n.f.)]
see stocking: NSR

 

understory [sous-étage (n.m.)]
see story

 

understory protection [protection du sous-étage (n.f.)]
Removal of mature trees while damage to the understory is kept to a minimum.

 

undesirable species [viabilité (n.f.)]
Species that conflict with or do not contribute to the management objectives. (19)

 

uneven-aged [classe de vigueur (adj.)]
Of a forest, stand, or forest type in which intermingling trees differ markedly in age. The differences in age permitted in an uneven-aged stand are usually greater than 10-20 years. (5)

Usually form more than three distinct age classes.

cf. even-aged

 

uneven-aged system [forêt vierge (n.m.)]
A silvicultural system in which stands have an uneven-aged structure. (1)

 

uniform shelterwood [régénération subséquente (n.f.)]
see shelterwood cutting

 

uniform system [mode de régénération par coupes progressives en coin (n.m.)]
see shelterwood cutting: uniform shelterwood system

 

unmerchantable [indésirable (adj.)]
Of a tree or stand that has not attained sufficient size, quality, and/or volume to make it suitable for harvesting. (5)

 

        Terms in the glossary are arranged alphabetically. In some instances, terms within a family (for example, thinning) are grouped together to make it easier for the reader to compare them. In such cases, each member of a family (for example, precommercial thinning) is also listed alphabetically, but the reader is referred to the family name.

        Each term appears in boldface letters and is followed by its equivalent term in French in brackets. Terms used as both nouns and verbs are identified as such by n and v, respectively. The generic of the French equivalent term is offered in this edition, and refers to the dominant noun when the equivalent is not a single word.

        The number in parentheses following a term refers to the source of the definition. These sources are listed below. In many cases, definitions taken from such sources have been paraphrased and/or edited to agree with house style. This publication is the source of those definitions not followed by numbers in parentheses.

1. Adams, D.L., et al. 1989. Recommended changes in silviculture terminology. Unpublished. Silviculture Instructors Subgroup, Silviculture Working Group (D2), Society of American Foresters. Washington, DC.

2. Crcha, J.; Martel, J.; Savard, J. 1977. Normes de traitements sylvicoles. Ministère de l’Énergie et des Ressources, Québec.

3. Ford-Robertson, F.C. 1971. Terminology of forest science, technology practice and products. Society of American Foresters, Washington, DC.

4. Forestry Statistics and Systems Branch, Canadian Forestry Service. 1984. Reporting and summarizing forestry change data—Manitoba pilot study. Petawawa National Forestry Institute, Chalk River, Ont. Inf. Rep. PI-X-36.

5. Haddon, B.D., editor. 1988. Forest inventory terms in Canada. 3rd ed. Canadian Forest Inventory Committee, Forestry Canada.

6. Merrill, D.F.; Alexander, M.E., editors. 1987. Glossary of forest fire management terms. 4th ed. National Research Council of Canada, Canadian Committee on Forest Fire Management, Ottawa. Publication NRCC No. 26516.

7. New Brunswick Department of Natural Resources. No date. Glossary of terms.

8. Ontario Ministry of Natural Resources. 1984. Glossary of terms. Unpublished.

9. Province of Saskatchewan. 1989. Silviculture definitions. Unpublished.

10. Smith, D.M. 1986. The practice of silviculture. 8th ed. John Wiley & Sons, New York.

11. Wright, J.W. 1976. Introduction to forest genetics. Academic Press, New York.

12. Zobel, B.; Talbert, J. 1984. Applied forest tree improvement. John Wiley & Sons, New York.

Sources Added to Second Edition

13. Agriculture Handbook No. 553. U.S. Department of Agriculture. Washington, DC.

14. Holmes, S. 1979. S. Henderson’s dictionary of biological terms. 9th ed. Longman Group Ltd., London.

15. Zumer-Linder, M. 1979. Environmental word-list. Ecological Studies 3. Swedish University of Agriculture Sciences, International Rural Development Centre, Uppsala, Sweden.

16. Forestry Commission Leaflet No. 77. Oxford, UK.

17. Dawkins, H.C. 1958. The management of natural tropical high forest with special reference to Uganda. p. 127–129 in Inst. Paper No. 34, Int. For. Inst., Oxford, UK.

18. Moore, R.; Mills, T. 1977. An environmental guide to Western surface mining. Part two: Impacts, mitigation and monitoring, p. VI.1-VI.9. Fish and Wildlife Service, U.S. Department of the Interior.

19. 1974. A glossary of terms used in range management. 2nd ed. Society for Range Management, Denver, CO.

20. Collocott, T.C. (Ed.). 1971. Dictionary of science and technology. W. & R. Chambers Ltd., Edinburgh.

21. Forest Engineering Research Institute of Canada. 1993. Personal communications.

22. Winters, R.K. (Ed.). 1977. Terminology of forest science, technology, practice and products. English-language version. Addendum 1. Soc. Am. For., Washington, DC.

23. Sutton, R.F.; Tinus, R.W. 1983. Root and root system terminology. Forest Science Monograph No. 24. For. Sci. 29 (Suppl.).

24. Franzese, M.L.; Thompson, T.J.; McNutt, J. 1978. Comp. glossary of forestry related terms. Potlach Corporation, Lewiston.

25. Snyder, E.B. 1972. Glossary for forest tree improvement workers. Southern For. Exp. Stn., For. Serv., US Dep. Agr. 22  p.

26. Steppler, H.A.; Nair, P.K.R. 1987. Agroforestry: A decade of development. ICRAF, Nairobi, Kenya. 276 p.

27. Sutton, R.F. 1985. Vegetation management in Canadian forestry. Govt. Can., Can. For. Serv. Sault-Ste-Marie, Ont. Inf  Rep. O-X-369. 34 p. + Append.

28. Ontario Ministry of Natural Ressources. 1987. Timber management guidelines for the protection of tourism values.

29. Thompson, A.J.; Fleming, R. 1991. Legislative and policy limits to successful integrated pest management in Canada’s forest. For. Chron. 67(5):493-499.