Laserfiche WebLink
1 <br />Vegetation Zones and Floristics <br />20 <br />General taxonomic sources which include the Monument area are by Harrington <br />(19541, Holmgren and Reveal (1966), and Welsh (1973). The vegetation of the <br />Monument has been the focus of several extensive taxonomic studies (Flowers <br />1963; Holmgren 1962a, 1962b; Holmgren and Reveal 1966). Welsh (1957) describes <br />the ecological relationships between vegetation types and geological formations <br />for the Monument in Utah. <br />Dinosaur National Monument lies on the border of the Uinta Basin Florisitic <br />Division of the Intermountain Region defined by Cronquist et al. (1972) and the <br />Mountain and Plateau area described by Costello (1954). Plants characteristic <br />of the semi-desert shadsca~le zone (Cronquist et al. 1972) are common in the <br />Monument around the Quarry (Welsh 1957), but also intrude into the canyon at <br />Echo Park, Island Park, and Jones Ho 1e. _.~ <br />i. 3' ~ kk pry ,,. - ..: <br />~k`~~'hese zones are often mixed rather than clearly <br />distinguishable, depending on slope, aspect, and substrate of the talus and side <br />drainages entering the river. ~,-' <br />~ `'"yen .~'',"'':. ~ ~,~~ • _;.~; ~ - '~' <br />. "`. <br />~ ` . <br /> <br />.: ~~ <br />;,°=' <br />a ate, ~~~- ~~g•- ~) . ~he floodzone is the area directly <br />influenced by high river discharge. The lower boundary of this zone is <br />marked by the river, and the upper boundary by a change in species <br />composition from scour-tolerant to scour-intolerant forms, and by an <br />accumulation of driftwood or other debris and litter above the boundary, or <br />f loodline. <br />