Laserfiche WebLink
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 (IPSW) Vegetation Type <br />New Horizon 2 Permit Expansion Study Area, 1999 <br />(n =50) <br />GRAMS /PLOT PROD. PERCENT <br />MORPHOLOGICAL CLASS 0( 25MZ) LBS /ACRE KG /HA COMPOSITIO <br />Perennial Graminoids 2089 . 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 />Revised September 2010 (PR 06) 2.04.10 -69 <br />