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Partition of nocturnal sap flow in and its implication for estimating
the whole-tree transpiration |
| Hua WANG 1, Ping ZHAO 2, Xi’an CAI 2, Ling MA 2, Xingquan RAO 2, Xiaoping ZENG 2, Quan WANG 3, |
| 1.South China Institute of Botany, Chinese Academy of Sciences,
Guangzhou 510650, China；Research Center for Eco-Environmental Sciences, Chinese Academy
of Sciences, Beijing 100085, China; 2.South China Institute of Botany, Chinese Academy of Sciences,
Guangzhou 510650, China; 3.Institute of Silviculture, Shizuoka University, Shizuoka
422-8529, Japan; |
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Abstract We analyzed the partition of nocturnal sap flow into refilling of internal water storage and transpiration in Acacia mangium. Sap flow of trees was monitored continuously with Granier’s sensors for estimating the whole-tree transpiration. Possible night transpiration and stomatal conductance at the leaf level in the canopy were measured with a LI-6400 photosynthesis measuring system. For nocturnal leaf transpiration and stomatal conductance were weak, nocturnal sap flow of mature A. mangium trees was mainly associated with water recharge in the trunk. No significant change in night water recharge of the trunk was found at both seasonal and inter-annual scales. Morphological features of trees including diameter at the breast height (DBH), tree height, and canopy size could explain variances of night water recharge. Furthermore, although the contribution of nocturnal sap flow to the total transpiration varied among seasons and DBH classes, the error caused by night water recharge on whole-tree transpiration was negligible.
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| Keywords
Acacia mangium
Granier’s thermal dissipation probe method
nocturnal sap flow
nocturnal transpiration
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Issue Date: 05 June 2009
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