2010-12-08_PERMIT FILE - C1981008A ‎(14)‎

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 12/8/2010
• Doc Name: Vegetation Information
• Section_Exhibit Name: Section 2.04.10 Vegetation Information NH2 Mine Area
• Media Type: D
• Archive: Yes

Table 2.04.10 -10
Mean Haerbaceous Production and Percent Composition (By Dry Weight) For The
Morphological Classes Encountered in Samples of The Swale /Drainage Vegetation
Type, New Horizon 2 Study Area, 1987
(n =50)
The results of shrub density samples conducted in the willow thickets are summarized in
Attachment 2.04.10 -6, formerly Peabody Appendix 10 -2 (Table 2 -12). The mean density of
coyote willow, the only shrub species represented, was 10.0 individuals per meter square.
This translates to 40,540 individuals per acre. Each individual willow had from one to eight
stems associated with the crown, so the total stem density would be substantially greater.
These density figures do not represent an average density for the Swale /drainage type as a
whole, but only in the thickets. In addition to the willows, approximately 14 cottonwoods
( Populus angustifolia and Populus sargentii and 48 Russian olives occurred in the
Swale /drainage vegetation type (from direct counts). The above two species occur in the drier
phase or fringes of the Swale /drainage, or adjacent to ponds.
A total of 48 species were found in the Swale /drainage type (Attachment 2.04.10 -5, formerly
Peabody Appendix 10 -1), indicating a higher level of diversity than is apparent with only
casual observation. Graminoids dominated as expected, with a total of 14 species (see Table
2.04.10 -9) with 10 having relative cover values of one percent or greater. Annual and
perennial forbs totaled only slightly less at 11, yet only one perennial and one annual forb had
relative cover greater than 1 percent. One shrub, coyote willow, was encountered in cover
sampling and it had a relative cover of three percent. The Swale /drainage type was less
diverse than the irrigated pasture type and ranked as the third most diverse type.
Revised September 2010 (PR 06) 2.04.1043
Production
Percent
Morphological Class
grams /plot (0.25m')
Ibs /acre
kq /ha
Composition
Perennial Graminoids
95.9
3,421.7
3,837.0
97.8
Perennial Forbs
1.7
60.7
68.0
1.7
Annual Forbs
0_5
17.8
20.0
0.5
Total 98.1
3,500.2
3,925.0
100.0
The results of shrub density samples conducted in the willow thickets are summarized in
Attachment 2.04.10 -6, formerly Peabody Appendix 10 -2 (Table 2 -12). The mean density of
coyote willow, the only shrub species represented, was 10.0 individuals per meter square.
This translates to 40,540 individuals per acre. Each individual willow had from one to eight
stems associated with the crown, so the total stem density would be substantially greater.
These density figures do not represent an average density for the Swale /drainage type as a
whole, but only in the thickets. In addition to the willows, approximately 14 cottonwoods
( Populus angustifolia and Populus sargentii and 48 Russian olives occurred in the
Swale /drainage vegetation type (from direct counts). The above two species occur in the drier
phase or fringes of the Swale /drainage, or adjacent to ponds.
A total of 48 species were found in the Swale /drainage type (Attachment 2.04.10 -5, formerly
Peabody Appendix 10 -1), indicating a higher level of diversity than is apparent with only
casual observation. Graminoids dominated as expected, with a total of 14 species (see Table
2.04.10 -9) with 10 having relative cover values of one percent or greater. Annual and
perennial forbs totaled only slightly less at 11, yet only one perennial and one annual forb had
relative cover greater than 1 percent. One shrub, coyote willow, was encountered in cover
sampling and it had a relative cover of three percent. The Swale /drainage type was less
diverse than the irrigated pasture type and ranked as the third most diverse type.
Revised September 2010 (PR 06) 2.04.1043