浙江大学学报（英文版）
浙江大學學報（英文版）
절강대학학보（영문판）
JOURNAL OF ZHEJIANG UNIVERSITY SCIENCE
2004年
10期
1218-1225
,共8页
尹光彩%周国逸%MORRIS Jim%黄志宏%褚国伟%周光益
尹光綵%週國逸%MORRIS Jim%黃誌宏%褚國偉%週光益
윤광채%주국일%MORRIS Jim%황지굉%저국위%주광익
Sap flow%Environmental stress%Eucalyptus plantations%Water conductivity
Sap flow and environmental conditions were monitored at two Eucalyptus (Eucalyptus urophylla S.T.Blake)plantations at Hetou and Jijia, located in Leizhou, Zhanjiang, Guangdong Province. It was found that daily sap flux density (SFD) of Eucalyptus was closely related to daily atmospheric vapor pressure deficit (VPD) (R2=0.76, P=0.01 at Hetou and R2=0.7021, P=0.01 at Jijia) at both sites. No significant relationship existed between daily SFD and mean daily air temperature at both sites. Daily SFD varied with wind speed Y=-17585X3+15147X2-1250.7X+2278.4 (R2=0.68; P=0.01) at Hetou and Y=-101.67X3-1.65X2-376.4X+ 1914.8 (R2=0.40, P=0.05) at Jijia, where Ywas daily SFD, Xwas daily wind speed.Experimental observations yielded the following data: (1) the critical lower and upper daily VPD threshold were 0 and 2 kPa,slightly lower under high relative humidity (＞80%) compared with those at the Jijia site; (3) The upper and lower threshold
