Response of canopy stomatal conductance of Acacia mangium forest to environmental driving factors |
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| Authors: | Xiaojing Liu Ping Zhao Xingquan Rao Ling Ma Xi’an Cai Xiaoping Zeng |
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| Institution: | (1) South China Institute of Botany, Chinese Academy of Sciences, Guangzhou, 510650, China |
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| Abstract: | Granier’s probes were applied to measure the sap flow of 14 sample trees in an Acacia mangium forest on the hilly lands in Heshan City, Guangdong, during the time period of October, 2003. The photosynthetically active
radiation (PAR), air relative humidity (RH) and temperature of air (T) above the forest canopy were recorded. The sap flow measurement was used in combination with morphological characteristics
of tree and forest structure to calculate the whole-tree transpiration (E), stand transpiration (E
t), and mean canopy stomatal conductance (g
c). Analyses on the relationships between tree morphological characters and whole-tree water use, and on the responses of g
c to PAR and vapor pressure deficit (D) were conducted. The results showed that whole-tree transpiration correlated significantly and positively with tree diameter
at breast height (DBH) (p<0.0001), with sapwood area (p<0.0001), and with canopy size (p = 0.0007) logarithmically, but exponentially with tree height (p = 0.014). The analyses on the responses of canopy stomatal conductance showed that the maximum g
c (g
cmax) changed with PAR in a hyperbolic curve (p<0.0001) and with D in a logarithmic one (p<0.0001). The results obtained with sap flow technique indicate its reliability and accuracy of the methods of estimation
of whole-tree and stand transpirations and canopy stomatal conductance.
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Translated from Chinese Journal of Applied Ecology, 2006, 17(7): 1149–1156 译自: 应用生态学报] |
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| Keywords: | sap flow whole-tree transpiration canopy stomatal conductance Acacia mangium vapor pressure deficit |
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