Laserfiche WebLink
• <br />TABLE 2.04.10-20 <br />MEAN HERBACEOUS PRODUCTION AND PERCENT COMPOSITION (BY DRY WEIGHT) <br />FOR THE MORPHOLOGICAL CLASSES ENCOUNTERED IN SAMPLES OF THE <br />SWALE/DRAINAGE (SW) VEGETATION TYPE <br />NEW HORIZON 2 PERMIT EXPANSION STUDY AREA, 1999 <br />(n=50) <br /> GRAMS/PLOT PROD. PERCENT <br />MORPHOLOGICAL CLASS 0( 25M'1 LBS/ACRE KG/HA COMPOSITE <br /> <br />Perennial Graminoids 208.9 7,461 8,357 90.6 <br />Perennial Forbs 21.7 775 868 9.4 <br />Total 230.6 8,236 9,225 100.0 <br />The willow component of the Swale/drainage type occurs on shallow, slightly elevated sites that <br />are better-drained than areas supporting vegetation that can tolerate standing or flowing water, <br />. and completely saturated conditions. No attempt was made to sample cover in the willow <br />component because of the extremely high shrub densities encountered. Qualitative evaluation <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 mean density of coyote willow, the only shrub species represented, was 78 stems per <br />meter square. This translates to 312,000 stems per acre. The density of actual willows is <br />expected to be much lower. It was impossible to tell which stem went with which individual and <br />since willow is a clonal body individuals are in determinant. These density figures do not <br />represent an average density for the Swale/drainage type as a whole, but only in the thickets. <br />A total of thirty species were found in the Swale/drainage type. Graminoids dominated, with a <br />total of twenty species (see Table 2.04.10-19) with ten having relative cover values of one <br />percent or greater. Annual and perennial (orbs totaled ten, only one perennial forb had relative <br />cover greaterthan 1 percent. <br />• (REVISED 9199) 2.04.10 - 69 <br />