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R. M. Gazal et al. /Agricultural and Forest Meteorology 137 (2006) 56-67 <br />W T <br />0 <br />10 <br />14 <br />d <br />12 <br />Y_ <br />10 <br />p <br />8 <br />6 <br />4 <br />v <br />6 <br />E <br />2 <br />E <br />2 <br />0 <br />W T <br />0 <br />1ti <br />d <br />14 <br />Y_ <br />p <br />12 <br />10 <br />8 <br />6 <br />4 <br />2 <br />0 <br />61 <br />185 186 187 188 189 190 220 221 222 223 224 225 <br />DOY (2003) DOY (2003) <br />Fig. 2. Thirty- minute average vapor pressure deficit, D (kPa), and measured transpiration, E (mm d -1), at the (a and c) intermittent and (b and d) <br />perennial stream sites during the pre- monsoon, July 4-9,2003 (DOY 185 -190) (a and b) and monsoon, August 8 -13, 2003 (DOY 220 -225) (c and d) <br />season. <br />16 <br />14 (a) 0700 -1200 h <br />12 • Intermittent stream site ° 4 <br />0 Perennial stream site ° ° 0o °c <br />t 10 ° 8goo6B o <br />E o o Wo g <br />8 0 oo ? o <br />09 00 <br />6 Cb ° <br />° 0 0 <br />0 <br />4 b <br />•• <br />° 0 o <br />*16111100 0 <br />• •• <br />2 0 f• � • <br />0 <br />16 <br />14 (b) 1230 -1700 h� <br />0 CL <br />12 A o <br />10 <br />L <br />8 <br />�E <br />U <br />', 6 <br />h <br />4 <br />2 <br />0 <br />(C) p ®� g o 0700 -1200 h <br />CD'fO <br />°6 6,908 <br />db o <br />00 m <br />o° <br />o cP <br />° <br />$ o <br />0 <br />0 ,; • <br />° <br />m • •• <br />obi • • <br />s• <br />(d) o cc. 1230 -1700 h <br />�3 0 <br />°°o o ,c � <br />0 <br />0 0 0 0 <br />° <br />8 <br />0 <br />• <br />c 90 • <br />• • <br />0 <br />° o °0 • <br />0 <br />0 2 4 6 8 0 2 4 6 8 <br />D (kPa) D (kPa) <br />Fig. 3. Relationship of average sap flow rate (7„ g cm -2 h -1) of cottonwood trees and vapor pressure deficit (D, kPa) at the intermittent (closed <br />circle) and perennial (open circle) stream sites in the (a and c) morning (07:00 -12:00 h) and (b and d) afternoon (12:30 -17:00 h) periods during the (a <br />and b) pre- monsoon (DOY 185 -190) and (c and d) monsoon (DOY 220 -225) season in 2003. <br />