PERMFILE111625

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 3/25/2003
• Section_Exhibit Name: NH2 Section 2.04.10 Vegetation Part 2
• Media Type: D
• Archive: Yes

•
FOR THE SAGEBRUSH - 2 (SG-2) VEGETATION TYPE, NEW HORIZON 2 PERMIT
EXPANSION STUDY AREA, 7999
(n=30)
•
•
SPECIES
Artemisia tridentata
Atriplex canescens
Chrysothamnus nauseosus
Juniperus osteosperma
#/ha
Total
MEAN DENSITY (STEMS/50Mx)
32.1
0.4
5.1
0.1 s #/ac
37.7 2.26 3,015 7,538
Minimum sample size required (nm;~)= 2 (based on total density)
with an average density of 32.1 stems/50m2 or (2,570 stems/acre). Rubber rabbit was the next
dominant shrub with 5.1 stems/50m2 or (407 stems per acre). Other species included Utah
juniper with 0.1 stems/50m2 or (5 stems/acre) and four-wing saltbush with 0.4 stems/50m2 or
(34 stems/acre).
Seventeen species occurred in the cover samples. Three species had relative cover values of
1 percent or greater. Grasses (including annuals) comprised six of the species (see Table
2.04.10-24), while annual/biennial/perennial fortis totaled six. Three shrubs occurred in the
cover samples, as did lichen and moss.
The sagebrush -2 (SG-2) vegetation type as identified within the study area occurs on soil map
unit 98G. The map unit is comprised of Bowbac and Bowdish soil. Within the complex are
small inclusions of coal. Bowbac is typically a big sagebrush range site and Bowbac is
typically a pinon-juniper range site. As evidenced by the cover data, and verified by field
observations, the pinyon-juniper woodland overstory has been essentially removed if it existed
at all. The removal of this overstory plus the level of disturbance associated with livestock use
and man's impact has completely altered the composition of the site. In evaluating the Guide
for Determining Forage Condition attached to the Pinyon-Juniper Woodland Site Description, it
is apparent that the sites would only warrant a poor forage condition rating. Note that no
woodland site index information has been provided in the Site Description.. The stocking rate
(REVISED 9/99) 2.04.10 - 78