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Beltline Reference Area #3 <br />Noxious Weed Density Sample Mean; 1998-2001 <br />1998 1999 2000 2001 <br />Thistles per sq. meter 10 i r 3 0 6 ~ 5 <br />Oxeye daisy per sq. meter 1 t t 3 <br />Noxious Combined per sq. meter 8.4 1 9 <br />From 1998 to 2001, thistle density sample mean declined by <br />approximately 95~',:. True mean declined by at least 85` : at tr,e <br />95°i~ confidence level <br />Frorn 1999 to 2001, ox-eye daisy sample mean was stable. <br />combined noxious sample mean declined sharply due to decrease <br />in thistle density. <br />Figure 6 -Beltline Reference Area #3 <br />Noxious Species Densities <br />. ~ ., <br />v - - ----- -- , <br />a ~ • , ; t Thstles per sq <br />a m meter <br />~ ; ~ •- Ox-eye daisy <br />Z ~ - ~ per sq meter <br />199& t u;r:-' :a,G~.~ .. ,, <br />