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<br />www.bio-geo.com <br />Table 4. Summary and comparison of vegetation production data measured at Irrigated Pasture <br />reclaimed area and Irrigated Pasture reference area, 2008. <br />• <br /> <br />Production Ib/acre Irrigated Pasture <br />Reclaimed Area 2008 Irrigated Pasture <br />Reference Area 2008 <br />Noxious weeds* 33.8 2.0 <br />Annual rasses* 0 0 <br />Annual forbs* 0.8 21.8 <br />Total annual lants* 0.8 21.8 <br />Shrubs* 0 0 <br />Perennial grasses 1,501.5 1,651.0 <br />Perennial forbs 654.0 5.1 <br />Total mean production of desirable plants <br />X 2,155.5 1,656.1 <br />Standard deviation of z 875.7 887.0 <br />Q =90% of the standard 1,490.6 <br />Number of samples 30 31 <br />Sample adequacy demonstrated Yes No <br /> <br />Comparison Statistics <br />Standard Error SE = s/ n 159.88 159.31 <br />SE Satterthwaite approximation) 214.75 <br />Degrees of Freedom df Satterthwaite 58 <br />Calculated t-statistic t, 3.097 <br />Table t-statistic (tt), 1-tailed, P=0.20, df <br />Satterthwaite <br />0.848 <br />*Not counted toward total production of desirable plants <br />3.3 Dryland Pasture, First Year (2007) <br />Cover, Dryland Pasture 2007 <br />2007 data for each cover transect are shown in the following tables in Appendix A: <br />Table A9: Cover, Dryland Pasture reference area, 2007 <br />Table A10: Cover, Dryland Pasture reclaimed area, 2007 <br />Table 5, below, shows summary statistics for 2007 cover measurements in the Dryland Pasture <br />reference area and the Dryland Pasture reclaimed area, and the statistical data used to <br />compare the reclaimed area means with the standard. <br />The amount of nonvegetated cover (mostly bare ground) was similar for the 2 areas. Total <br />mean cover and the variance of the means were also similar. However, differences exist <br />between the 2 areas in plant species composition. The shrubs snakeweed (Gutierrezia <br />sarothrae) and fourwing saltbush (Atriplex canescens) comprised about 17% relative cover in <br />the reference area, but are largely absent in the reclaimed area and were not encountered in <br />any transects. Total cover of perennial herbaceous vegetation was similar between the 2 areas, <br />but consists mostly of forbs in the reference area (especially groundsel, Packera multilobata) <br />14