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• comparisons is as follows: <br />xrevp _ .90 ( (.83 xbp)(.17 xsp)) with 90X statistical confi~fence <br />where: x ~ mean herbaceous production revegeteted area <br />rave <br />xb ~ mean herbaceous production mountain brush reference <br />P <br />area <br />x = mean herbaceous production sagebrush reference area <br />sp <br />Production data will be collected from randomly located plots, Sampling will be to <br />adequacy or to en upper limit of samples determined in consult atibn with the Division. <br />goeties Diversity. Diversity in reclaimed areas will be based on a performance standard <br />reflecting evaluation of monitoring data from reference areas and reclaimed areas <br />collected since 1987. Date from the original baseline study egmpleted in 1980 was not <br />used in developing the standard because cover date was collect ec) as basal cover for all <br />species, but included canopy cover for shrub species only. The use of Daubenmire plots <br />• combined with the basal cover estimates resulted in a lower numbeo- of species present than <br />what is now indcateC in reference area monitoring. <br />Diversity for reclaimed areas is difficult to assess since these areas are quite <br />dissimilar [o the adjacent native communities relative to those parameters which ere <br />representative of advanced successional status (i.e., at subclimax or climax). In the <br />native communities these parameters are diversity and woody plant density. Furthermore, <br />diversity in reclaimed areas is strongly influenced by grading end topsoiling procedures, <br />revegetetion techniques, applied seed mixes, climatic patterns during the liability <br />period, end the length of time for suecessional processes [o act upon [he reclaimed <br />community. <br />Observations in reclaimed areas indicate these areas have the potential to be more <br />representative of the native sagebrush type rather than the mixed brush type. Monitoring <br />date supports these observations to some extent. The number of pe rennlal species with <br />relative cover greater than three percent in the sagebrush reference area is eight: three <br />forbs, three grasses, and two shrubs (7997 monitoring data). Representative retleimed <br />area monitoring date from 7991 (wedge Pasture) shows eight perehnial species oetur with <br />greater than one percent relative cover: three forbs, four presses, and one shrub. <br />although three percent reletlve cover was selected for the sagebrush reference area, a one <br />13-37 Revised 01/15/93 <br />