Feb. i6 t 1914 
Indicator Significance of Vegetation 
4i3 
Table XVIII.— Principal types of vegetation of Tooele Valley in relation to average soil 
moisture and salinity conditions . 1 
Plant community. 
Sagebrush. 
San d-h ill 
mixed. 
Shadscale. — 
Kochia. 
Greasewood- 
shadscale... 
Grass flat. 
Salt flat, 
Moisture and salinity conditions. 
Source of moisture. 
Direct precipitation. 
....do. 
....do. 
.... do. 
Direct precipitation 
and high water 
table. 
Direct precipitation, 
high water table, 
springs and irriga¬ 
tion. 
Direct precipitation 
and high water 
table. 
Surface foot of soil. 
Nonsaline, usually 
dry in summer. 
.... do. 
do. 
.do. 
Saline or nonsaline, 
usually dry in 
summer. 
Moderately saline, 
moist. 
Saline, moist. 
Soil below surface foot. 
Nonsaline, usually dry 
in late summer. 
Nonsaline, usually (?) 
moist in summer. 
Saline, usually dry in 
late summer. 
Saline, usually dry in 
late summer. 
Saline, moist. 
Moderately saline, 
moist. 
Saline, moist. 
1 The term' ‘ dry ” as here applied to the soil indicates that its water content is below the wilting coefficient. 
The term'' moist ” implies that moisture available for plant growth (above the wilting coefficient) is present. 
The average conditions as respects moisture and salinity of the soil 
which characterize the land occupied by each of the more important 
types of vegetation are stated in Table XIX. The data for the different 
samples upon which these averages are based are given in full under the 
respective associations (Tables IV, IX, X, XII, XV, and XVI). Only 
typical areas of each plant community have been taken into account in 
computing the averages. 
Table XIX.— Moisture conditions and salt content of the soil in typical areas occupied 
by the principal plant communities . 1 
Plant community. 
Soil depth (feet). 
Sagebrush 
(Artemisia 
iridentata). 
Kochia 
(Kochia 
vestiia). 
Shadscale 
(A triplex 
confertifolia). 
Greasewood- 
shadscale 
(Sar cobatus 
and Atri- 
plex). 
Grass flat. 
Salt flat. 
Salt grass 
(Disiichlis 
spicata). 
Allenrolfea 
occidentalis. 
Moisture Equivalent. 
i 
14 - ^ 
25. 8 
22. 9 
24. 1 
34 - 1 
26. 7 
I 5 - 6 
27. 0 
3 1 * 0 
26. 6 
31.8 
23-4 
16. 5 
33 - 5 
34 - 5 
26. 1 
33*3 
21. 8 
4 . 
15.8 
3 1 - 9 
3 °. 6 
26. 9 
49. 1 
30.4 
1 All data are given as percentages of the dry weight of the soil. 
