FOREST TERMINOLOGY 71 



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., Absoluter 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 20-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 1 to 20 years would be referred to as age class I. See also 

 Development 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 to the percentic or 

 absolute representation of the different age classes in area or amount, or (in selec- 

 tion forest) in number of trees (G., Altersklassenverhaltniss) . 



Disruption of age classes refers to the attempt to provide safety against fire or 

 insects, by locating the age classes in small areas. 

 G., Altersklassenzerreissung. 

 Normal age classes. See Normal. 

 All-aged forest. {Obs.) See Uneven-aged forest, Selection forest. 

 Annual plans. See Working plan. 

 Area tape. A tape from which the basal area may be read directly when it is 



placed around the tree. 

 Artificial reproduction. See Reproduction. 



Aspect. The direction toward which a slope faces. The eight main points of the 

 compass, N., NE., E., SE., S., SW., W., NW., are distinguished in forest description. 

 Syn. : exposure. 

 G., Lage. F., exposition. 

 Assortment. The classes of wood materials into which the harvested crop may be 

 divided, as logs, fuel wood, pulpwood, railway ties, etc., or according to size into 

 timberwood (stoutwood, above 3-inch diameter); brushwood (below 3-inch 

 diameter); cordwood, spHt and billets, etc. See also GrsLdxng. 

 G., Sortiment. F., categoric. 

 Ball planting See Forest planting. 

 Bark blazer or gouger. See Scribe. 



Barren, An area which is devoid of trees (moss barren), or beai;ing only stunted 

 trees, then denoted by the character of the tree growth, as pine barren, oak barren, 

 spruce barren. 



