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<br />PHENOlo-;Ir.,d 1JI.'.j l.l!j '11.::1 1'1 !Pl',IIAll.llol;; I'J(INI'; \;1 tF1./\lluN T{\ $NOWHf.LT I)ATSY
<br />
<br />, 'fl
<br />
<br />ABSTRACT
<br />
<br />,
<br />In an att~tD.pt to detcnnlne Ull' erl ""t ,'1 ,"111 1111"1"1-;11;,.,1
<br />.A,nOiipack on the develupment 111 1.'.'1 t{l!n TIP,rulil?;:O;iii
<br />plant '~'Ciell, s1)( lIitt'!! \Jere t~Tio~<~i). UHC-e,1l'1l111l
<br />north and south lu.pects at three l.!ll!V;1 t Ions. 2900 In,
<br />)140 m, .nd )lIU m. Twenty-tive !ipccl;:;~-nr-jir;ji1i:~
<br />were ob..rved for the varl0U8 pllf:n'lj>lll'l:tl:"i!l "lith TS'~I;i'I'
<br />{mens ot. each spec1es measured at each s1t;;-:-- lii..~i' {l
<br />'pe-rloa Ot tQuC gt'owlng f:f:'I\!HIOR. rllllllir '5T1,OOr tlbt>f>rv.,"
<br />tions were recorded. Tile' fallD~Jllg l'llnr~,'lpl l~llcs
<br />were observed: leaf growth. Hlmut grlllJth, inflores'
<br />cence height, total plant height. ll1rltJre~,.'cnrp. dIJvl!]"
<br />opment by percentage of flo\lers In bud. ol,~n. Ilr In
<br />various stagee of fruit development an13 seed dhpersal.
<br />Correlation coefficients "'ere deterralned betueen the
<br />year day of v4rious phenophases and year day of 100
<br />percent snow dissppearance 1n the plots. An 811t11ysis
<br />of variance W88 done betwedn Thurber fe~C"lIc (festuc.a
<br />!.~ Vuey) year day of maximum folnHoI( II <tnrl-YPtlr-~
<br />day of sno,", dluppearllncfl III 19JJ. IQ77, tllIll PH).
<br />The data produced the follnwlllR ~f'lIPlnll7.Al1111l.'1:
<br />
<br />1. 10 @,ene.ral for ev~r 10 perc.ent lllCrl!lUJe in Rl\OW
<br />.above the lour term ltvr.rAgl!, r If" ('fir Il'!r pll;oo-'::' -
<br />phases are de ayed up to 8 days, drepcllJ1nS.'OTi-
<br />.other VarIableS suco as atr temperafrrre:"- Tfini
<br />delay 18 not linesr tor all phenoph8ses-of-~
<br />~pecle.. ~enerallYf the earlter p~nopna9~9
<br />are delayed mote thiilf1li-lalif . phC;I()f,liUC8 ,
<br />tot' . siven spec1ea,
<br />
<br />2. Plants of the same sJ'eciee un !iuuth asp~n!;
<br />~.!:ached maximum growth, IJowerln8.!._!!L!!~~!lS' <llId
<br />maturity up to 4 \.leeks nhe-rld "f I'I:lnt~ I".(-'llfl fl1r,
<br />u~~ equivalent north aspects, --, --_. -.
<br />
<br />1. PLanta of the sallie species Ilt high.., &..II'V.ll i"l1~'
<br />on equivalent ~spect8 rcaCTiiFClVC'gi!nH I vi! ;iiltl rl'"
<br />productive maturity up to b W'eel(;qliiTcr" ilitlll
<br />plante at lower elevlJdoni:~-~~--- -. ~,
<br />
<br />4. 'the north aspect and higher ele-....atiu" plants
<br />matured. flowered, and frulted Dt a smaller iIht'
<br />than the ..me species on .!~!Jt_.!~r!~.t~ alld'lIt
<br />~()lIer elevations.
<br />
<br />5, T!lere was Rre-atest correlllliun ~~_~~~~u lhl~ VII. Iou.'!
<br />IJhellophuea and sno'" free date in lhe (!KCCll~d VI!
<br />.~~w ye-ar and on Bouth aSpec.!:.B ~ -- - ,-
<br />
<br />6. The late blooming species' phenoph.1!:lEs (prohilhly
<br />lom~ day plants) were least lnt luenced .1!1.' ~iiti\"
<br />depth.
<br />
<br />7. Certain plant species showed /:lit aldllty tu "calch-
<br />up" in their development de-spite ~-l7i(e ;c.Hn t {n
<br />the spring.
<br />
<br />8. The difference in dll.tefi of phenophllse.'1 hC(W('('1l
<br />north and "outh aflpect~ de::rf'I\~i'(l-n;:;-'"Tli,,";ll r If-lIdf'
<br />increased.
<br />
<br />l/ln Steinhoft. H.M.. and JJD, Ives rEds),
<br />t-1ountain~, Colorado. <;nn lnlm E'-'lll'j'\'
<br />A/I'ceaenr address: Depl. nf Hit1lnH~ 1"'1 r
<br />
<br />Till data slIpport
<br />\01111 ra!P-1I1! in n
<br />AlI,l InRrllrnllnn.
<br />lUf'111 II '
<br />
<br />the. theeia that an increase in sno'.!
<br />delay in herbaceous ph.nt development
<br />Th!/:! delay could be as long as 1
<br />
<br />S'(~<, ~.)!-l 'i
<br />
<br />("':1/.", fR-~
<br />
<br />CtlNr.LUSIONS
<br />
<br />An increase in snow fall 1n the forest ecosystem will
<br />cause the sno", tree date to occur later in the !p'r1ns~ '
<br />1n turn, initiation of growth of herbaceous planu--' .,
<br />will be later which will "set back" most. if not'ilt,
<br />p~~~ophases. This will cause "spring" to come L9.ter'
<br />l~ the year on the average. A8 lar a8 affecting ,the
<br />fi:tbaceous plant populations. an increase 1~ snow-faii
<br />tit !!'!Ukely to have Any dit4!l~~_JtH.~t, _1'hlLi;JI~'; pOllia
<br />~~( these planU sllow 8 hlfh variation h\ date of
<br />growth init1s.t1on and stH Obtain .rnatur._Uon'"before
<br />the end of the gro"'int season. The ;tu'dy n~ed8 to he
<br />cftrrled on for severa more yeara for n'more
<br />definitive conclu~lon.
<br />
<br />197~. ~c/lI,\~II:al lmllnct~ 01 ~nnwpack augmentution
<br />1""1'" t. rlll,l ~h'port. Cul,q.Hlo Stnte llrllv. Publ..
<br />If','j!;, 'li\'Ul', llurllllg", C"lonldn, 8J301.
<br />
<br />in the San JW1!\
<br />Fort Co}llnld.
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<br />30
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<br />1.'.1
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<br />A_R.l_~
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