APPENDIX 331 



Shelterwood method. See Reproduction method. 

 Shoot. See Tree class. 

 Silvical. Pertaining to silvics. 



Silvics. 1. A branch of ecology that treats of the life of trees in the 

 forest; forest ecology. 



2. The Ufe history, requirements, and general characteristics of a 

 forest tree from the point of view of silviculture. 

 Silvicultural characteristics. See SUvics (2). 



Silviciilture. The art of producing and tending a forest; the appUcation 

 of the knowledge of silvics in the treatment of a forest. 

 G., Waldbau, Holzzucht. F., Sylviculture. 

 Single tree method. {Obs.) See Reproduction (Selection) method. 

 Site. An area, considered as to its physical factors with reference to 

 forest producing power; the combination of climatic and soil conditions 

 of an area. See Site class. 

 Syn. : locality, physical t)T)e. 

 G., Standort. F., station. 

 Site class. A designation of the relative productive capacity or quality 

 of different sites with reference to the species employed; the volume 

 or the height produced at a given age being used as standard for classi- 

 fication. In Europe five classes, in the United States often only three 

 classes are differentiated, designated by Roman numerals, quality I 

 representing the most productive site class. 

 Syn.: quality of site. 

 G., Bonitat. F., qualite du sol. 

 Slit method. See Forest planting. 



Slope. The gradient of the land surface. In forest description, the fol- 

 lowing terms are used to define the slope, each of which has its equiva- 

 lent in percentages of the horizontal distance and in degrees: 



Precipitous = over 100% = over 45° 



Snowbreak. The breaking of limbs of trees by snow. 

 G., Schneebruch. F., bris de neige. 



