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2.04.10 Vegetation Information <br />Succulents are scattered throughout this vegetation type although they contribute <br />little to total cover. Plains prickly pear, Opunita polyancantha is the most common. <br />PRODUCTION <br />The estimated production of clipped plots in the Greasewood Shrubland ranges <br />from 48.2 g/m2 to 239.0 g/m2 and averages 100.3 g/m2 or 894 pounds per acre. <br />Graminoid production accounts for over half of the total biomass (59.9 g/m2, 60 percent <br />of the total produced). The major graminoid producer is cheatgrass (44.8 g/m2). <br />Western wheatgrass is also an important graminoid, producing 13.3 g/m2. See Table <br />4.5-4. <br />DENSITY <br />Greasewood is the most common shrub in this community with density of 0.4 <br />shrubs per square meter (1,569 shrubs per acre) followed by seepweed (523 shrubs per <br />acre), big sagebrush (496 shrubs per acre), mountain pepperweed, Lepidium <br />montanum (a sub -shrub, 468 plants per acre), and rubber rabbitbrush (248 shrubs per <br />acre). Average height for all shrubs is 95 centimeters with a range of 125.4 cm for <br />fourwing saltbush and 56.5 cm for shadscale saltbush. See Table 4.5-5. <br />RICHNESS AND EQUITABILITY <br />Richness of species is the number of species occurring in a sample or an area. <br />The equitability index refers to the relative similarity of cover values or the evenness of <br />cover distribution among the species found in the Greasewood Shrubland and the <br />Juniper Woodland. Seventeen species were found on seventeen transects. Equitability <br />or the evenness of cover distribution was low (index = 0.75) because of the strong <br />dominance of greasewood and cheatgrass. See Table 4.5-6. <br />PR -02 2.04-59 10/12 <br />