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Journal of Zhejiang University SCIENCE A 2004 Vol.5 No.10 P.1218-1225


Sap flow response of Eucaylyptus (Eucalyptus urophylla) to environmental stress in South China

Author(s):  YIN Guang-cai, ZHOU Guo-yi, Jim Morris, HUANG Zhi-hong, CHU Guo-wei, ZHOU Guang-yi

Affiliation(s):  South China Botanic Garden, CAS, Guangzhou 510650, China; more

Corresponding email(s):   gcyin@scib.ac.cn

Key Words:  Sap flow, Environmental stress, Eucalyptus plantations, Water conductivity

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YIN Guang-cai, ZHOU Guo-yi, Jim Morris, HUANG Zhi-hong, CHU Guo-wei, ZHOU Guang-yi. Sap flow response of Eucaylyptus (Eucalyptus urophylla) to environmental stress in South China[J]. Journal of Zhejiang University Science A, 2004, 5(10): 1218-1225.

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%A YIN Guang-cai
%A ZHOU Guo-yi
%A Jim Morris
%A HUANG Zhi-hong
%A CHU Guo-wei
%A ZHOU Guang-yi
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%DOI 10.1631/jzus.2004.1218

T1 - Sap flow response of Eucaylyptus (Eucalyptus urophylla) to environmental stress in South China
A1 - YIN Guang-cai
A1 - ZHOU Guo-yi
A1 - Jim Morris
A1 - HUANG Zhi-hong
A1 - CHU Guo-wei
A1 - ZHOU Guang-yi
J0 - Journal of Zhejiang University Science A
VL - 5
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SP - 1218
EP - 1225
%@ 1869-1951
Y1 - 2004
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2004.1218

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 andY=-101.67X3-1.65X2-376.4X+1914.8 (R2=0.40, P=0.05) at Jijia, where Y was daily SFD, X was daily wind speed. Experimental observations yielded the following data: (1) the critical lower and upper daily VPD threshold were 0 and 2 kPa, within which daily SFD varied from 540±70 L/(m2·d) to 4739±115 L/(m2·d) at Hetou site, from 397±26 L/(m2·d) to 3414±191 L/(m2·d) at Jijia site; (2) Diurnal SFDs at Hetou site were much higher under low relative humidity (<30%) and slightly lower under high relative humidity (>80%) compared with those at the Jijia site; (3) The upper and lower threshold of daily and diurnal RAD for the optimal water use of E. urophylla plantations were 18±2.7 and 2±1 MJ/(m2·d), 669 and 0 J/(cm2·h) during the observation period.

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