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-9- <br />• <br />Midpoint of <br />Coverage Cass Range of Coverage, 8 Coverage Class, ~ <br />1 0-5 2.5 <br />2 5-25 15.0 <br />3 25-50 37.5 <br />4 50-75 62.5 <br />5 75-95 85.0 <br />6 95-100 97.5 <br />Source: Daubenmire, 1959 <br />In using coverage classes which are ground Dover percent estimates as <br />reoamiended by Daubenmire (1959), total Dover (vegetation plus litter and <br />rock plus bare ground) seldan sums to 100 due to the fact that ranges of <br />• cover class are estimated and only range mid-points are used in the analy- <br />sis of over data. <br />Frequency data were derived from the recorded occurrence of each species <br />in the quadrats established in each vegetation type. The maximum height <br />of each shrub encountered in the quadrats was recorded in inches with a <br />sti~c ruler. <br />All coves, frequency and shrub height data were collected during the <br />period August 27 through September 7, 1979. The vegetation types sampled <br />for Dover, productivity, frequency and shrub height are depicted on the <br />Map entitled "Vegetation Types" in T*~„~;Y A. <br />PRODUCi`I~1 ESTII~.TFS <br />Field Techniques. Circular wire exclosures, approximately 1.Sm in diameter <br />and 1.Sm high, were situated at each sample point during early May, 1979. <br />• Dortiestic livestock were kept off the study area until exclosures were es- <br />tablished. All exclosures were constructed of 2x4 inch mesh wire to pre- <br />vent grazing by all medium-sized (i.e., rabbits) and large mammals. f~cclo- <br />sures were supported by '~ inch steel reinforcing rod and labeled as <br />~~.., <br />