APPENDIX 



FOREST TERMINOLOGY* 

 TERMS IN FORESTRY 



COMPILED BY A COMMITTEE OF THE SOCIETY OF AMERICAN FORESTERS 



Absolute forest land. Land fit only for forest growth. 



Syn. : absolute forest soil. G., Absolute! Waldboden. F., sol forestier. 

 Absolute form factor. See Form factor. 

 Acid humus. See Humus. 

 Accretion. See Increment. 



Advance growth. Young trees which have sprung up spontaneously in 

 openings in the forest, or under the forest cover (before reproduction 

 fellings are begun). 



Syn. : volunteer growth. 

 G., Vorwuchs. F., semis preexistant. 

 Afforestation. See Forestation. 



Age class. All trees in a stand or forest whose age falls within stated 

 limits, usually divided in 2o-year periods (5 years in coppice), but in 

 old stands may be of wider range, and may be stated in extent of area 

 or in percentage of the whole stand or forest, or, in selection forest, by 

 number of trees. A stand in which the trees fall between the age of 

 i to 20 years would be referred to as age class I. See also Develop- 

 ment class. 



G., Altersklasse. F., classe d'age. 



Gradation of age classes refers more specifically to this formation of 

 age classes. See also Tree class. 



G., Altersabstufung. F., gradation d'age. 



Distribution of age classes refers to either the local distribution of age 

 classes (G., Verteilung der Altersklassen, Altersklassenlagerung) ; or 



* Reprinted from the Journal of Forestry Vol. XV, 1917, pp. 71-101. 



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