3. 



CUT, SELECTION. The removal of mature trees, either as scattered 

 individuals or in small groups, at relatively short inter- 

 vals and repeated indefinitely. The objective is repres- 

 entation of all age -classes distributed throughout the 

 stand.* (See Appendix.) 



CUT, SHELTERWOOD . The removal of mature trees in a series of two 

 or more cuts for the purpose of obtaining natural regen- 

 eration under the shelter of the residual stand.* (See 

 Appendix. ) 



CUTTING, SALVAGE. The removal of trees killed or injured by 



fire, insects, fungi, or other harmful agencies for the 

 purpose of utilizing merchantable timber before it 

 becomes worthless. (BCFT) 



CUTTING, SANITATION. A specific form of improvement treatment 

 where diseased, injured, or insect-infested material is 

 removed or treated for the purpose of reducing the risk 

 of pests or disease in the forest.* 



CUTTING SECTION. A subdivision of a management unit comprised 

 of one or more compartments and formed with the object 

 of indicating the progress of the coupes in some special 

 manner.* 



CUTTING, SEVERANCE. A cleared strip-cut through a forest for the 

 purpose of developing a wind-firm edge before making cuts, 

 particularly shelterwood strip fellings. (BCFT) 



DIAMETER, AVERAGE. The diameter corresponding to the mean basal 

 area of a group of trees or of a stand. (BCFT) 



DIAMETER BREAST HEIGHT. The diameter of a tree stem measured at 

 breast height and usually outside bark. Abbr. d.b.h. 

 (BCFT modified) 



DUFF. The matted, partly decomposed organic surface layer of 

 forest soils. (See Litter and Humus.) 



ECOLOGY. The study of relation of plants and animals to their 



environment and to the site factors that operate in con- 

 trolling their distribution and growth. (SAF) 



EVEN-AGED. Applies to a stand in which relatively small age 



differences exist between individual trees. The maximum 

 difference in age is usually 20 years. (SAF) 



FOREST MANAGEMENT. The practical application of the scientific, 

 technical, and economic principles of forestry. (BCFT) 



GIRDLING. To cut through the bark and outer living layers of 



wood in a continuous incision all round the bole of a tree. 

 (BCFT) 



