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2000 Noxious Weed Density Summary* <br /> Sutey Reference Area #1 <br /> Transect Thistles per Square Houndstongue per Total per square meter <br /> Meter square meter <br /> 1 14.9 .09 15.0 <br /> 2 5.2 .3 5.5 <br /> 3 4.8 .09 4.9 <br /> 4 1.6 .2 1.8 <br /> 5 4.3 .6 4.9 <br /> 6 4.5 .9 5.4 <br /> 7 1.9 2.1 4.0 <br /> 8 2.5 .7 3.2 <br /> 9 3.7 .9 4.6 <br /> 10 3.2 .8 4.0 <br /> Thistle sample mean= 4.7 per square meter <br /> Houndstongue sample mean= 0.7 per square meter <br /> Noxious total= 5.3 plants per square meter <br /> *Thistle species included bull thistle (Cirsium vulgare), plumeless thistle, Canada thistle, and <br /> musk thistle. No attempt was made to separately count each species. Houndstongue was <br /> counted in 1999 and 2000, but not 1998. <br /> 1998/1999/2000 Thistle Density <br /> 1998 Sample Mean . . . . 17.5 plants per square meter <br /> 1999 Sample Mean . . . . 13.9 plants per square meter <br /> 2000 Sample Mean . . . . 4.7 plants per square meter <br /> 1999/2000 Thistle and Houndstongue Combined <br /> 1999 Sample Mean . . . . 14.9 plants per square meter <br /> True Mean . . . . . . . . . . . 11.7<u<18.1 (95% C.I.) <br /> 2000 Sample Mean . . . . 5.3 plants per square meter <br /> True Mean. . . . . . . . . . . 2.8<u<7.8 (95% C.I) <br /> Thistle density and combined weed density declined significantly at the 95% level of statistical <br /> confidence (alpha= .05; 2 tail, 9 df) between 1999 and 2000. <br />