2014-05-15_REVISION - M1987064

• Permit No: M1987064
• IBM Index Class Name: REVISION
• Doc Date: 5/15/2014
• Doc Name: Response to adequacy review comments TR04
• From: Elam Construction, Inc.
• To: DRMS
• Type & Sequence: TR4
• Email Name: KAP
• Media Type: D
• Archive: No

20051 COrYfUNW(X)D NVATER RrSPONSE DuRING DRoucHT
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Vapor Pressure Deftit (kPa)
181
Fir 3. Environmental control of whole-tree phy5ioI4T, A, leaf transpiration (E) ve rsus vapor
pressure deficit
k 'VPD) f
or watered (filled circles) and unwatered trees (unfilled circles); B, leaf specific canopy conductance (C,) versus
vapor pressure deficit (VPD) for watered (filled circles) and uuwatered trees (unfilled circles).
signs of water stress (e.g., yellowing of leaf tips
and loss of leaves), and (3) environmental con-
ditions conducive to water availability limiting
growth (e.g., lack of recent precipitation, high
VPD, summer drought), our results indicate
that watered trees did not increase their rates
of leaf-specific transpiration, canopy conduc-
tatter, or whole-tree hydraulic conductance rela-
tive to trees that did not receive supplemental
water (Fig, 2). Averaged over the entire exper-
imental period, watered trees received 42.5 L
more water per day than unwatered control
trees (Fig. 1). Sap flux measurements scaled to
the whole-tree level indicate that both watered
and unwatered trees transpired an average of
24.7 L water &I. Hence, water additions should
have been more than enough to stimulate tran-
spiration rates that were low compared with
other studies (Zhang et al. 1999, Schaeffer et
a]. 2000, Nagler et -al. 2003). Similarly, canopy
conductance was relatively low in all trees over
our study period (e.g., "hang et al. 1999, Horton