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<br />
<br />OfJi)082
<br />
<br />TABLE -I
<br />Ins/rram flow models pred/cllng an/lua! trt'e ring widtll for cottol/wood populatIOns at Bishop
<br />(ruk from atmual {lou' m the grOv.'mg ~t'Q50" (Q; IFf IImJ), prior-year rmg widIIlIRW1-lJ,
<br />and Ql'eragr maximum tt'mpera/urr durmg the groumlg SfQSOII (T; In 'CJ or durmg ,\;fa.1I
<br />(TM.ay)Q
<br />
<br />Diverted Reaches
<br />
<br />Growth of Fr'
<br />black cottonwooc
<br />has been limited
<br />many years in thl
<br />reaches of BishoF
<br />studv. Annual nl
<br />dive"rted reaches
<br />and 4 mm, and (
<br />is low. Instream
<br />healthy vigoroU!
<br />wood can be esti
<br />tionships describ
<br />(l)annuaIgrowir
<br />ring width. (2) ril
<br />or,and (3) ring w
<br />talit\'. Results fo
<br />ships indicate th,
<br />cottonwood mair
<br />width of at leasl
<br />elevation. The I
<br />growth to such II
<br />ing instream mo
<br />crease growth of
<br />from 1.9 mm (= 1
<br />width scale for t
<br />dardized ring w
<br />indicate that ani
<br />hm}. Similar calc
<br />Fre-mont cotton\'>
<br />value-s of 59 ar
<br />Anothe-T approa(
<br />able- flow volum,
<br />ton woods is to
<br />tained bv nonw;
<br />those in'the SUI
<br />growth "standa
<br />vie Ids similar re
<br />growth rate- of tl-
<br />lye-qual to the r
<br />assodatN with
<br />canopies.
<br />Flows that al
<br />he-althy cottonw,
<br />(ca. 35-59 hmJ/v
<br />times highe-r the
<br />venN reache-s l
<br />13.5 hmJ/ye-ar)"
<br />released below
<br />\-'ear), and abou
<br />;'atural flow (93
<br />Results from e
<br />e-aste-rn Sierra N
<br />
<br />R2 df F
<br />
<br />Regre!Osion equation
<br />Reach 2: P{1pulu~ tncnot"llrpll
<br />RI\' a; -16J ... 1.34 )< 10 ~ l<. Q ... 0.43 " RW/ - I ... 0.06 " T
<br />(0.62){2.71 " 10 5) (0.121 (0.02)
<br />Reach 4, P. I'(tn/mlll
<br />RVI.. - -442'" 0.46 " RW/ - 1 ... 165 " 10 ~ l<. Q ... 0.15 " T
<br />(122)(0.08) (2.93 " 10 5) (0.04)
<br />Reach 4: P. tTlch,lCllrJ'll
<br />RW- -0.15... 1.34)< 10 ~)( Q + 0.04 )( TM~~
<br />(048)(2.08)( 10-s) (0.02)
<br />Reach 5: P. frmlOnlll
<br />RW '" 0.17... 1.07 )( 10-2 )< Q ... 064 " RW, - 1
<br />(0.10){1.56" 10-5) (0,10)
<br />
<br />p
<br />
<br />0.75 19 204 <0,001
<br />
<br />O.Bb 19 40.6 <0,001
<br />
<br />0.74 19 28.7 <0.001
<br />
<br />0.80 19 390 <0.001
<br />
<br />~ Standard errors for the rt'gression equations are in parentheses
<br />
<br />nual radial increment averaged <2 mm for
<br />both reaches. Average canopy vigor for the
<br />two reaches also was low (most trees had
<br />betwf'en 20~ and 60% of potential canopy),
<br />and the percentage of dead trees was high
<br />
<br />(31% and 21%, respectively). Radial growth
<br />at the supplemented.flow reach was high
<br />(4.2 mm). but canopy vigor was low and
<br />dead trees were relatively abundant.
<br />
<br />") I
<br />,
<br />1
<br />~ .t
<br />~ ,.
<br />r
<br />
<br />~
<br />
<br />'.l) 20,
<br />
<br />
<br />"UoC"~, POPU!,.us fR[WON'1I
<br />
<br />,,-
<br />~ ::\- k-\
<br />~ ..2\ /:\ 1 '~",~
<br />s"O.',\ ....... ,,&-.i~ .,
<br />~ O.B. \':\:4:: /rr-e
<br />i 0,6. ~ '~\4
<br />~ 0... 1
<br />1;;;0,2. I
<br />0,01, "",."""",
<br />U107' nn7. ~~ ~6n'B nBOB' B2BJB.B~B6B7Ba
<br />(1)2.0~ l!LoCtt2;l>QPlAlJSTlI~.l I
<br />q,
<br />~ ::I\l ~ A. ..c!,./~:
<br />e 1.0. :0. .."0,, r"1~o--"o-O,;;1' ~ ~
<br />I' "; ,I--...~ -
<br />0.'. r'lo
<br />O-OGllOUP'
<br />0... e-e::llOUP'.P<IUI
<br />(;;0.21 4-:.c;IlOUP2
<br />0.01 a-aGllOUP2-PMIl
<br />"107'72n7.~~n~~BOB1~~~MUVBa
<br />""
<br />
<br />..
<br />
<br />o
<br />
<br />o .
<br />
<br />o~,
<br />.~.
<br />
<br />,
<br />o 2 J . ~ 6 7 e , '0 11
<br />(I) ~t
<br />
<br />~ . ~
<br />i ,;
<br />~ ,-.
<br />~ .1
<br />.J
<br />
<br />=
<br />
<br />.
<br />
<br />,
<br />
<br />. .~
<br />
<br />...
<br />
<br />.. ~
<br />
<br />-.
<br />
<br />lo'lE-4C><2
<br />
<br />o 2 J ~ 6
<br />"'foIGWlOl'><{......)
<br />FIGURE 6. C~nopy vigor d~ss (on ~ sc~l~ 01
<br />1-5} of cotton....oods in r~btion to~'.rr~gr trr-e
<br />ring width ovrr 1979.1988 for ~~ches 2- 4, ~nd
<br />5 ~l Bishop Cr~k. Rtg~ssion rqudions ~~:
<br />y - 1.6 + 1.7. - 0.3r, R: - 0.31, P < 0.002-
<br />n~ch 2; y - 1.0 + 1.0. - 0.05r, R: - 0.64, P
<br />< 0.001, r~~ch 4; y - 1.5 + 0.8. - 0.05r, R'-
<br />0.59, P < 0.001, rt-~ch 5.
<br />
<br />FIGURE S. .-4.ctu~1 ~nd pr~dictrd v~lu~s for
<br />st~nd~rdiud trr~ ring widths lor cotton ....oods
<br />~t t....o dil.~rtrd ~~ches ~long Bishop Cr~rk,
<br />for th~ prriod 1969.1988. Th~ prrdictrd ,'~lu~s
<br />~n from modrls c~libr~rf'd on Group 1 t~.
<br />
<br />~"l 8
<br />
<br />[ J. C. Strombe
<br />
<br />Ri,'ers . Volume 2, Number 1
<br />
<br />January 1991
<br />
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