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GENERAL38462
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Last modified
8/24/2016 7:58:13 PM
Creation date
11/23/2007 9:41:24 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981048
IBM Index Class Name
General Documents
Doc Date
2/18/1992
Doc Name
DATA FOR PROPOSED VEGETATION STANDARD AT TRINIDAD BASIN MINE
From
GREG LEWICKI AND ASSOCIATES
To
MLRD
Permit Index Doc Type
VEGETATION
Media Type
D
Archive
No
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~r <br />r <br />Annual forb cover was low, averaging 0.3 percent absolute <br />cover. This was comprised entirely of yellow sweetclover which was <br />relatively abundant on score slopes. Other species present included <br />Fremont goosefoot lChenvpxtium ~nen<-ntiil, narrowleaf goosefoof <br />(Chenvpodium /eptvphy.lluml, and skyrocket gilia 19,ormvFyi4 ng~cegvtvl. <br />Other minor plan) species are listed in Table 6. <br />Production <br />Total average herbaceous production was 48.6 g/3 m2 or about <br />144 Ibs/acre. Perennial greminoids provided most of this production <br />with 33.4 g/3 m2. The major producers were sideoats gramu 111.0 g13 m2), <br />blue grams 17.7 g/3 m21, and mountain muhly 14.0 g/m21. Other prevalent <br />species were western wheetgrass, green needlegrass, elk sedge, and red <br />threeawn, Total forb production averaged 10.6 g/3 m2. See Table 7. <br />. Shrub Density <br />Total shrub density averaged 15.6 shrubs/50 m2 or 1,264 <br />shrubs/acre. Gambel's oak was the dominant species with 9.7 shrubs/50 m2. <br />Other important species were mountain mahogany (2.9 shrubs/50 m21, <br />mountain snowberry 10.8 shrubs/50 m21, and skunkbush sumac IRl1u~ tlacmaticol <br />with 0.5 Shrubs/50 m2 ITable 81. <br />Shrub heights ranged from abc•ut 30 cm to more than 200 an <br />for the taller Gambel's oaks, and generally averaged about 1 m in height. <br />Tree Density <br />Total tree density for the Pinyon-Juniper Woodland Complex <br />averaged 13.8 trees/250 m2 or 256 trees/acre. Pinyon pine was the most <br />common with 10.5 trees/250 m2 and one-seed juniper was second in ebun- <br />tlence with 2.0 trees/250 m2. Ponderosa pines were scatteretl sporadically <br />end averaged 0.8 trees/250 m2. Rocky Mountain juniper and Douglas-fir <br />averaged only 0.3 and 0.1 treesy250 m2. <br />Estimated free heights ranged from about 2 to 5 m for pinyon <br />pine, averaging about 3 m. Ponderosa pine and Douglas-fir were taller, <br />with estimated heights ranging from about 5 to 20 m, <br />3.2.3 Disturbed Lend <br />The disturbed lands, including newly revegetated areas, were <br />not sampled. Several seed mixes have been used for the revegetated areas, <br />but the most common species are cool season bunchgresses such as tall <br />t wheetgrass lAgnvpyvevn a/ongo#um1, pubescent wheetgrass IApavpy~vn <br />.ticichvprrvaum), slender wheetgrass tA9nvplyeun lnachytnu.luml and crested <br />wheetgrass IAQsupy~vn deae~+.tvauml. The meadow area lmmedlately west of <br />the mine office, end adjacent to the main access road, was seeded et some <br />time In the past wl}h prlmerily smooth brume IQ2umvp,<~ <neyaial and tall <br />I wheetgrass. <br />A <br />-lo- <br />
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