6. 



REPRODUCTION. All well developed trees below 1 inch diameter 

 class which give an indication of being represented in 

 the future stand.* 



ROTATION. The number of years required to establish and grow 



timber crops to a specific condition of maturity. (SAP) 



SAND. Soil particles between 0.02 and 2.0 ram. in diameter. 

 (BCFT) 



SCALPING. In tree planting, removal of sod or other vegetation, 

 before or at the time of planting, from any spot or 

 1 scalp* to reduce competition with the tree. (SAF) 



SCARIFICATION. The operation of breaking up the forest floor and 

 top soil preparatory to natural regeneration or direct 

 seeding. (SAF) 



SCATTERED. The term applied to any productive forest land clas- 

 sification of any age when the stocking is less than 0.3>* 



SILT. Soil particles between 0.002 and 0.02 mm. in diameter 

 (BCFT) 



SITE-CLASS. A measure of the relative productive capacity of a 

 site for a particular species. The average height at a 

 given age is generally the basis for classification. (BCFT) 



SITE PREPARATION. Disturbance of the forest floor and the top 



soil to create suitable conditions for natural regenera- 

 tion, seeding, or planting. This treatment may include 

 prescribed burning and the removal of undesirable growth.* 



SILVICULTURAL SYSTEM. A method of silvicultural procedure worked 

 out in accordance with the accepted sets of silvicultural 

 principles by which crops constituting forests are tended, 

 harvested, and replaced by new crops of distinctive form. 

 (BCFT) (See Appendix.) 



STAND. An aggregation of trees possessing sufficient uniformity 

 in composition, age, arrangement or condition to be 

 distinguishable from adjacent crops. (BCFT) 



SUBCOMPARTMENT. A division of a compartment requiring different 



treatment- from that for other portions of the compartment. 

 (SAF) 



SUBSOIL. The soil between the top soil and the underlying rook. 

 (BCFT) 



SUSTAINED YIELD. A policy, method or plan of management implying 

 continuous production with the aim of achieving, at the 

 earliest practical time and at the highest practical level, 

 an approximate balance between net growth and harvest, 

 either by annual or longer periods. (BCFT) 



