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Rrfrrcncc A«a Nu t <br />I'm rr Ircnds for RCICfeO~C ~\rea a ~ Jdicr from thr other rcfcrcnx :rrrt+. m Itcu co+~cr of:dl +egcluuon <br />c:ucgoncs urcrc:rscd sktrph hrtsviceu I'r)x and I'+'+'+ fhn n drtr to the lira tlut Ihr h;ltlarr ll.n ++as <br />mpsoilcd and sxxded m the Iall of I')'+?, anJ I `+'1% was thr lint gra++rng seaxvn lltc coccr uraeasr riom <br />lo`/tt to I `+'+'+ «Ikt:ts nntumuon of plants lieu +u•rc sst'dhngs m I't'/8 \':grt:won starxls m Ore other <br />rclcrrnw areas h:tJ hrcn scedcJ at least fis c ~ ran pour to the uuu:d cunplmg Smcr I'>~)'). total vcl;;chtuon <br />a/vcr;urJ non-nmmus loth cover have rencuncd rcL•nrvcly stable, ++hdc grass cmcr Itte incrcascd :utJ <br />nonous wt.`txl coccr has stytificatttlp dahncd {I~rgurc SI <br />Figuro 5 -Beltlmc Relcrence Area a3 Absolute <br />CovcrTrends; 1998.2001 <br /> 80 0% . Absolute <br />? - <br />50 0% <br />Noxrous Cover <br />0 <br />~ a0 0% ~-Absolute Grass <br />d <br />~ <br />30 0% C aver <br />a 20 0% - _ - Absolute Forb <br />¢ t00% - Cover <br />~ 0 0% - - ~ -total vegetation <br /> t958' t995 2000 2001 Cover <br />?iNll ahsnlutc and relauvc coccr M sprctrs :md ratcgan rs pnscntcsl m I'ahlM Ahsolutr anJ r>:Lurt r <br />cover saml>•r mc:tns hs curgun and scar arc presenlrJ m 1 atilt lu I3lC:IU4 1'/`)R +s ay tltc lust Eros+rng <br />scastnr. ctkcts of sprn mg art nwkcd D+ grossth :mJ r¢rnmrtwn of rndrv rdual plmus, :mJ u< such <br />com(xtnson of 19v% ahsolutc coccr caluc+ v+ith suDsryucm ~wr ahrsulutc coccr c slues is not mca»ingl'ul <br />ROL7nri rP\Yr, a Rll'&SIIR' Of Speile5 CUn11x15r11011, dtxs aIION (or lunrted. enhrn aucgop cpmpartsun <br />R-tuc.n Iv')x anJ later vests Cover summon rahles for Iv7ri. Iv9'/, aril ?rNxr arc included m the <br />resp:ctrcc UlstG .Rnnwl Wccd S:unplmg Itcpon HascJ on rc4tUCC rover. the+i+imrnant nmiaus sprdes in <br />I v!+x ++rrc thr Drcnmals plumclcss thtstlr (I S i"~~).:urd musk llustlc r l0 1" hl. ++rih oscv c J:us~ thr <br />rcmumng nouous spa;«s s:rmplyd (' C'~.d Relmr+c cover of plurclcs thrstlc rotrghh douhleJ hclwcen <br />I')!1R unJ I t>99. Dut +i+.ilmcd sharpls hciwecn I `M)`):utd ?uUU. artJ sots not rncountcrcd h+ cosrr ctmplrrtg <br />m ?tNr I Musk Uristlc was cwt rncoumurd In' rover s:uul9mga(lcr IH')% Inns•rdrnuliwuon of plumclas <br />thrstlc seedlings as musk dustlr m I v9X rs a IxMSihrhty l Canada thrsAc was first rrr:auurnYl m 'in)rr, ;mJ <br />was a nunor suuid romprrnart m loth ?{MI(r and irNr 1 kclauvr cm'rr of utc~r duts~ rcm:um:J rcluu+cly <br />slahlr m rr the course of the ittxh <br />Ihat+ccn I'>')9:ind 2~t~rl. ahx+lUlC W+l'r Of rtOtIJUS $pr(:ICti dcCltnrJ froln IG S°b 10 : S". u ++htlr aI7WIUIC <br />l:rrss coccr urcrcasrd liom 11 }~~ to >'/ \°:. llrc r~spmse of plumclcss thrstlc. a luclt durlnud Iron I S.0'h <br />ahscdulr coca w I'rr/, tc. u3"%.oecr m 2rMxl anJ a°~ coccr m aNt 1. rs Urc rwwn for Urc o+cr-all da:hnc <br />m notrous sprcres rover ~\ number nl grass spaics contnhutcd ro the morose m abuilutt: cover of <br />grrsscs over the p.ntxl Ahtcolute coccr of nnn-nououa fortis has rertumal relaU+eh staple since 1'H/9, <br />write no n;:tdih app:ucnl effects of spracmg on mJr+tdual spxics or the catcgon as a uhulc <br />Nam+us spears do nsrh tk>:hntd shurph brlwern I ~/"ri and ?tell, oral rrnuural low w ?tNrl. Jar to the <br />respcrosr ol'thr nosrous thtstlr slxsirs as illustrated m Prl;tuc o Although thtstlr sp+cres wc« not <br />sep:rntrd rn the drnsny csuntatr. rl can It inferred Iztsal on the rover Jata that the Jruruurr +icclme <br />rc(1carJ the «sprmsr of plumclcss thrstlc and Ipossrhly 1 musk lhisdc llristlc+kaah vnrplc mean <br />Jr.hncJ h+ upprosmtutch ')~0., from I')'>% to 7tru 1. from Ip 7 pLmts per squ:trc meter u/ u 5 plants per <br />>yuan• meter (hcvr d;us~ Jrnsm ++as suuplcJ ooh m 19'/'):md 'tNrl. and Jrnsrts nnuucd smhle at tlrr <br />rc•lab+rh low Irvrl of I I plants per sgrnur meter m I'/'r`+ arxl I ~ pLmis per square meter m ?rxrl <br />