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<br />mar_'s occuaation. Kart and Morton (1988) provide an excellent <br />review of the effects grazing management and vegetation response <br />both :rpm a historical and from a scientific perspective. <br />The overwhelming assumption states that the impact of heavy <br />u <br />grazing acts to remove the herbaceous component and allows the <br />shrub snecies to persist and eventually dominate the vegetation <br />composition. Pieper and Heitschmidt (1988) stated that a common <br />characteristic of overgrazed rangelands is a decrease in highly <br />palatable grasses, forbs and shrub snecies and an increase in <br />unpalatable species, primarily woody species. It has been stated <br />that heavy grazing is the primary :actor encouraging sagebrush <br />reinvasion in Oregon (Johnson :969); however, prover grazing <br />management will not curtail this process, but rather slow the <br />process (3artoiome et ai. 1982). It is strongly felt that shrub <br />production will ultimately occur, and the use of grazing may <br />enhance this natural successional process. <br /> <br />