Grenier and Nelson Chapter 19 Inland Habitat Associations in Oregon 



Appendix 3 Variables used to describe forest stands >75 years old on the Siuslaw National Forest. Data were 

 collected by the Ecology Program (USDA 1983, USDA 1985), Siuslaw National Forest, Corvallis, Oregon, 

 1982-1986 



ELEV The elevation of the plot (meters) 



ASPECT The aspect toward which the plot faces recorded as degrees azimuth 



SLOPE The slope of the plot in percent 



TREER The percent cover of understory trees (<3.7 meters in height) 



SHRUBH The percent cover of high woody perennial plants greater than 0.9 meters in height 



HERB The percent cover of herbaceous plants 



MOSS The percentage of the ground area which is covered by moss or lichens 



SERAL The serai stage of the site [1 = very early, pioneer (1 to 30 years) brush and small trees; 2 = early 



serai (30 to 100 years) young stand; 3 = mid-serai (100 to 00 years) mature stand; 4 = late serai, 

 highly stable (200 until late serai species are gone) old growth; 5 = climatic, topographic, or 

 edaphic climax (serai dominants gone)] 



TBAL The total basal area in m 2 /hectare of living trees 



TBAD The total basal area in m 2 /hectare of standing dead trees, including snags in all stages of deacy 



greater than 3.7 meters in height 



DIA The diameter of the site dominant trees to the nearest centimeter 



HT The total height measured on the site dominant trees 



AGE The breast height age of the site dominant trees from bore count 



USDA Forest Service Gen. Tech. Rep. PSW-152. 1995. 



