FOREST TERMINOLOGY 97 



raphy and comprises a main logging unit or group of logging units. A single block 

 may contain many thousand acres. 



Working plan unit. A forest area managed under one working plan. It may 

 or may not coincide with the administrative unit. 

 G., Wirtschaftsganzes. 



Working group. An organization or working plan unit, comprising an aggregate 

 of compartments or stands to be managed under the same silvicultural system and 

 rotation. 



Syn. : working block; working circle; working figure; working section; manage- 

 ment class. 



G., Betriebsklasse. F., Serie d 'exploitation. 

 Sublet. See Subdivision. 



Suppressed, a. Having growth seriously retarded by shade, dying or so far injured 

 that recovery is not probable. See also Crown class. 

 G., unterdriickt. F., domine. 

 Sustained annual yield. See Sustained yield. 

 Sustained periodic yield. See Sustained yield. 



Sustained yield. The yield or cut of timber from a forest which is managed in such 

 a way as to permit the removal of an approximately equal volume of timber 

 annually or periodically, equal to the increment. 

 Taper. The gradual diminution of diameter in the stem of a tree from base to top. 

 Taper table. A tabular statement of average diameter measurements of stems at 

 specified heights above ground, recorded for trees of varying d. b. h. and height 

 classes. Used for determining volumes and dimensions of products. 

 Thicket. A stand of saplings. See Development class. 



G., Dickicht. F., fourre. 

 Thin, V. To make a thinning. 

 Thinning. See Intermediate cuttings. 

 Timber forest. See High forest. 

 Timberland. See under Forest. 

 Timber form factor. See Merchantable form factor. 

 Timber scribe. See Scribe. 

 Timberwood. See Assortment. 

 Tolerance. The capacity of a tree to endure shade. 

 Tolerant. Capable of enduring more or less heavy shade. 

 Syn. : shade-bearing, shade-enduring. 

 G., Schattenertragend. F., a temperament delicat. 

 Transition period. The time used in bringing an unorganized forest into sustained 

 yield management. 



G., Uebergangszeitraum. F., periode de transition. 

 Transplant, v. To transfer seedlings from the seedbed and set them in the ground 

 in another part of the forest nursery. 



G., verpfianzen, verschulen. F., transplanter. 

 Transplant, n. A seedling which has been transplanted one or more times in the 

 nursery. See Planting stock. 



G., Schulpflanze. F., plant repique, plant rigolee. 



