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REP08531
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Entry Properties
Last modified
8/24/2016 11:38:23 PM
Creation date
11/26/2007 11:54:32 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Report
Doc Name
HISTORIC RECORD STUDY AREA VEGETATION AND PRECIPITATION CHARACTERIZATION 1997 WEST ELK MINE SOMERSET
Permit Index Doc Type
REVEG MONITORING REPORT
Media Type
D
Archive
No
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Graminoids were the predominant life form in the study area. The dominant graminoid <br />species in the study area was Bromus inermis at 36.67 percent mean cover (55.40% <br />relative cover). There were two subdominant species in the historic record vegetation <br />community, one grass and one fort. The sub-dominant grass was Poa pratensis with <br />10.13 percent mean cover (14.204'o relative cover) and the sub-dominant fort was the <br />annual Convo/w/us ar~ensis at 8.27 percent mean cover (11.22% relative cover). <br />Three forb species accounted for significant cover (relative cover greater than 3%); <br />Taraxacum otEcina/e (dandelion) at 2.80 percent mean cover (3.69% relative cover), <br />Erigeron Dagellaris (daisy) with 2.67 percent mean cover (4.4040 relative cover), and <br />Copious caudatus (lupine) with 1.60 percent mean cover and 3.84 percent relative <br />cover. <br />Vegetative litter (prior years growth, dead wood, and other biologic organic material) <br />comprised 25.33 percent ground cover within the historic record vegetation <br />community. Bare soil accounted for 7.87 percent ground cover in the study area. No <br />rock was encountered during cover sampling. <br />Herbaceous Production <br />Results of herbaceous production sampling in the historic record vegetation community <br />are presented in Table 5. Mean total herbaceous production of the sampled quadrats on <br />the study area was 184.94 g/m2 (1648.51 lb/ac). Herbaceous production quadrat <br />weights were relatively consistent, with the standard deviation (47.12 g/mz) being <br />25.48 percent of the value of the herbaceous production mean. <br />Woody Plant Density <br />A census of woody plants present in the historic record study area was undertaken, with <br />results presented in Table 6. Seventy-four individual woody plants occurred in the <br />historic record vegetation community. The dominant woody plant was Symphoricarpos <br />romndifolius (snowberry) with 68 individuals. Chrysothamnus nauseosus (rubber <br />rabbitbrush), Gutierrezia sarothrae (snakeweed), and Artemesia tndentata (big <br />sagebrush), were the remaining woody plants in the study area. Symphoncarpos <br />rotundifolius is an invader from the understory of the adjacent oakbrush community. <br />Gutierrezia sarothrae and CTrrysothamnus nauseosus shrubs are characterized as <br />invaders of open spaces in early successional stages. Artemesia tndentata is a wind <br />borne invader from sagebrush communities to the north and west. <br />Species Composition <br />Within the historic record vegetation community cover sampling, three lifefotTns were <br />represented; graminoids, forbs, and shrubs. The lifeforms included four perennial <br />grass species, one annual grass, eight perennial forbs, one annual forb, and one woody <br />shrub. Of the fifteen species encountered during cover sampling, eight were native, <br />including one grass, six forbs, and the woody shrub. The seven introduced species <br />-7- <br />
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