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TABLE 2.04.10-10 <br />MEAN HAERBACEOUS PRODUCTION AND PERCENT COMPOSITION (BY DRY WEIGHT) <br />FOR THE MORPHOLOGICAL CLASSES ENCOUNTERED IN SAMPLES OF THE <br />SWALE/DRAINAGE VEGETATION TYPE, NEW HORIZON 2 STUDY AREA, 1987 <br />(n=50) <br /> Production Percent <br />Momholooical Class aramslolot (0.25m') Ihslacre kalha Composition <br />Perennial Graminoids 95.9 3,421.7 3,837.0 97.8 <br />Perennial Forbs 1.7 60.7 68.0 1.7 <br />Annual Forbs 0_5 17.8 20.0 0.5 <br />Total98.1 3,500.2 3,925.0 100.0 <br />indicated that the canopy and ground cover, including litter, in the willow thickets was equal to <br />or greater than 100 percent. In more open areas where the willows were less dense, <br />quackgrass, alkali muhly and common spikerush were prevalent. <br />The results of shrub density samples conducted in the willow thickets are summarized in <br />Peabody Appendix 10-2 (Table 2-12). The mean density of coyote willow, the only shrub <br />species represented, was 10.0 individuals per meter square. This translates to 40,540 <br />individuals per acre. Each individual willow had from one to eight stems associated with the <br />crown, so the total stem density would be substantially greater. These density figures do not <br />represent an average density for the Swale/drainage type as a whole, but only in the thickets. <br />In addition to the willows, approximately 14 cottonwoods (Po~ulus anqustifolia and PODUIUS <br />saroentii) and 48 Russian olives occurred in the Swale/drainage vegetation type (from direct <br />counts). The above two species occur in the drier phase or fringes of the Swale/drainage, or <br />adjacent to ponds. <br />A total of 48 species were found in the Swale/drainage type (Peabody Appendix 10-1 ), <br />indicating a higher 1eve1 of diversity than is apparent with only casual observation. <br />Graminoids dominated as expected, with a total of 14 species (see Table 2.04.10-9) with 10 <br />having relative cover values of one percent or greater. Annual and perennial forts totaled only <br />slightly less at 11, yet only one perennial and one annual fort had relative cover greater than 1 <br />(REVISED 9/1999) 2.04.10 - 43 <br />