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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 />Morphological Class grams/Dlo[ 10.25m'1 Ibs/acre kg/ha Composition <br />Perennial Graminoitls 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 />Total98.7 3,5002 3,925.0 100.0 <br />indicated that the canopy and ground cover, including litter, in the willow thickets was equal to or <br />greater than 100 percent. In more open areas where the willows were less dense, quackgrass, <br />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. In <br />addition to the willows, approximately 14 cottonwoods (Populus angustifolia and Po ulus <br />sargentii) 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 ), indicating <br />a higher 1eve1 of diversity than is apparent with only casual observation. Graminoids dominated <br />as expected, with a total of 14 species (see Table 2.04.10-9) with 10 having relative cover values <br />of one percent or greater. Annual and perennial (orbs totaled only slightly less at 11, yet only <br />• (REVISED 8/15/00) 2.04.1 ~ - 38 <br />