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Rtal~l.fti AND UI~CI ~~lO\ <br />Rcfcrcncz Arcs Na. I <br />From I`M)x to 2nul. total vcgcwtion ero\cr fits rcntauud rcluuvcly stable, while grass co\cr has nscn <br />dramauadh' and co\ cr of noxious spccles :uu1 non-nouous (orbs h:nro nl:ukcdly declined (sec Flgurc I ). <br />F )gars t tiutcy Rcfe rcn ce Area 111 •Absolu le Cover <br />Trends: 1996.2001 <br />SO 0% <br />X0.0% - -Absolute Noltloua <br />~ <br />30 0% Cover <br /> <br />20 0% - -Absolu to Gress <br /> Cover <br />10 0% <br /> --Absolu to Forb <br />00% Cover <br /> <br /> Q <br />~i Q <br />X <br />X T o I a I V e g e t a t i o n <br /> ~ <br />i ~ <br />i Cove ~ <br /> Year <br />I'aMc I at the cn1 of the rcpon fists _'txt l at)solutc and rclau\c erovcr b\ spceie~s and catcgon, "fahlc <br />fists uttsolulc and relative cover slmplc mesas M• wugoq and year, I`r)x through 2tw I. At)solmc ern•er of <br />noxious speras deehncd from 6 7"%, to ': 2"~ over the course of the study. while absolute rnvcr of pcrcnnul <br />gmssts Ille'ral5ed from ? 7°iL 10 111, T'o "I~1C Ille'ICise'd CO\ Cr pro\'ided b\ pelt llnl:tl grace:S 11':IS nlTscl h\ a <br />comptlmblc loss of pcrcnnctl fortx "lltc reduction m pcrcnnlal fort) cover was largely due to the virttl.•d <br />chmin:luun of the low-gro\\mg \\ady legume, black medic (.tlrr6avrgn 6rjnduurl l)Ixk medic xcounted <br />I'or 2x°•6 atxolute erover m Iv9x and txssed on t:over, uas the dt)min:ml species m the st:md M a wide <br />mlrgln By 2tN7I, blxk modie •aeeroumal for only n ."-b absolute wvcr Tile dominanl spcclex to 2tH11 \ros <br />Kcnwcky bluegrass (Pun prnten.visi, \\hich h:tA mctrascd from ? T'6absolute \ro\cr m 19vx, to I C.`P% <br />al)solutc coca in 2x71 Cover summtn tables for 199x, 1999. and 2tNx7 arc included in the perttnrnt <br />DMG Annwl Wecd Sampling Report Based on cover, tlx dt)tmn:mt noxious s77ccicc throughout the <br />period of study wars plumcless thlsUc, which dlxhmd Irom r, ?°6 absolute saver m 19')x to I T!o absolute <br />cover in 2nnl <br />The upparcnl dcellru: of noxious species \\us rcal, aS C\1dCMk'd M' IhC deilsil\ duu IIIUStmtcd Itl I IE,Urc :. <br />t h'cr the coupe of the study. thiulc.knslty sample maul dex:hned by 9a°.., from 17 S thistle phmts per <br />ury:uc mccer m 199x, to 1 plant per square meter m 21M) I Iloundutmguc drnsny )vas not cstrm:ucd in <br />I `)<)x but was in follow)ng ywrs. and the In7td for combined Itoxious spec ics was slmilur to that for thistles <br />onh, with an x~a nduaron from 19'ri f0 2Ut11 ~Ilx \':tnOUSIlOx10LL5I111511C SpcCIC51\'Cre''~luttlped" fof <br />purpose of the dcaslty estinlatc. due to the slgnlfiwnt additiored umc cxprndlture th:u would have t)ecn <br />rcyuiad to crount each thistle spcYics scparucly 21x11 dcnsih d:lla Is presented In Table ?, whllc Table a is <br />a sumncln of rlo,uous spares deaslty sample roams by ywr Ucrtsny d:na and statistics 1'or wch ywr of <br />Illc study arc rcponcd in tl)c pcnincnt 1)MG Amluul Wccd Sampling Rcpon <br />('cn:un ol)scnauons nacd by the ~unpling cmv and the proja-t nuuugcr over the course of the study <br />should be noted. ('attic ttad gnvcd Rcfcrcnce Arcs N I prior to sampling in 1999, but not in the other }qtrs. <br />