munities into community types based upon sim- 
ilarities in management and easily distinguish- 
able field characteristics. Potential vegetation 
could then evaluated within community types 
by use of multiple-variate analysis formulas in 
which the investigator would measure pre- 
scribed environmental factors for use in the 
formula. For example, potential hits on Poa se- 
cunda in the Agropyron/Poa type would re- 
quire measurement of: Percent slope, slope di- 
rection, and total soil depth. These measure- 
ments would be entered in the following for- 
mula: Poa hit = 21.30 — 0.11 (percent slope) 
—0.31 (slope direction) —0.14 (total soil depth). 
TABLE 3.—Topographic, soil, and soil surface factors associated with vegetation and surface ston- 
iness when four nonforest bunchgrass types are combined for analysis (Artemisia arbuscula, A. 
rigida, A. tridentata, and Agropyron/Poa) 
Dependent factor, percent variation accounted for 
Agropyron 
Comp. Hits 
Independent Hits 
Topographic: 
Elevation _________ anes Done acs 
Percent slope ___-_- Wake Saae Se 
Slope direction ---_- 14 16 11 
Slope position -_-_- Behe of ae =e 
Microrelief ____-_-- Eevee? oe nae 
Range east __---_-- ee — 10 
Township south __- 15 18 ae 
Soil: 
AG DEH as ease aes = wee Esau ee 
A texture _______- cae ala ae 
A structure 
texture ________ Soe ee ae 
Total depth ______- pe 9 peers 
Effective depth ___- ea ee 37 
Soil stone _______- Sines one Era oes 
Bedrock fract. ___- ares 2A ees 
Surface: 
Rock ome oe neh 
Bare ground ______ par ee Roce 
Erosion 
pavement ______- es ees Evers ot 
hitters ee se= so. ae Pes Baas 
Moss 
Total variability 
accounted for 43 43 58 
* Indicates these items not tested. 
Festuca Poa 
Total Surface 
Comp. Hits Comp. production stone 
—- oe 1 
41 = ne 18 31 
74 0 50 29 55 
215 
