2008-03-27_REPORT - C1982057 ‎(4)‎

• Permit No: C1982057
• IBM Index Class Name: REPORT
• Doc Date: 3/27/2008
• Doc Name: 2007 Revegetation Monitoring Report
• From: Seneca Coal Company
• To: DRMS
• Permit Index Doc Type: Reveg Monitoring Report
• Email Name: DTM
• Media Type: D
• Archive: No

Production
(Table 10)
Total average production was 647.7 Ibs per acre. Native perennial cool season grasses
contributed the most with an average production of 440.7 Ibs per acre. Native perennial forbs
contributed 182.0 Ibs per acre. Native annual and biennial forbs, introduced annual and biennial
forbs and introduced annual grasses were also present, each with less than 15 pounds per acre.
SAGEBRUSH EXTENDED REFERENCE AREA
(Photographs 26-33 in Appendix 5)
Cover
(Table 11)
Native shrubs were the most abundant lifeform in the Sagebrush Extended Reference Area,
making up 37.1 percent toward the total 70.6 percent vegetation cover (all hits). Within this
group, big sagebrush (Seriphidium tridentatum) and mountain snowberry (Symphoricarpos
rotundifolius) were most common, having 17.3 and 15.3 percent total vegetation all-hit cover,
respectively. Native perennial cool season grasses were the second most common life form
contributing 18.5 percent total vegetation all-hit cover. Agassiz bluegrass (Poa agassizensis) and
slender wheatgrass (Elymus trachycaulus) were the most abundant of this group (9.7 and 3.1
percent total vegetation all-hit cover respectively). Native perennial forbs were the third most
abundant group contributing 11.1 percent total vegetation all-hit cover, comprised by numerous
species with low percent cover values and lacking dominant species. Weedy milkvetch
(Astragalus miser var. oblongifolius) and western yarrow (Achilles lanulosa) had the highest
percent cover values of the native perennial forbs (2.1 and 1.9 percent total vegetation all-hit
cover respectively).
Total average vegetation cover, for first hits, was 63.1 percent. Total average vegetation cover,
for all hits, was 70.6 percent. Standing dead, litter, bare soil, and rock each had 3.0, 17.5, 16.3,
and 0.1 percent cover, respectively (first hits). Average species density was 24.4 species per 100
sq.m.
Production
(Table 12)
Total average production was 897.5 Ibs per acre. Native perennial cool season grasses and
native perennial forbs contributed the most with an average production of 451.4 and 369.4
Ibs/acre respectively (together making up approximately 92% of the total production). Introduced
annual grasses contributed 66.0 Ibs per acre. Native annual and biennial forbs and introduced
annual and biennial forbs were also present, each with less than 10 pounds per acre.
10