Abstract
Aims This study was designed to analyze the partitioning of night sap flow in Acacia mangium and its implication for estimating whole-tree transpiration.Methods Analyses were performed on the partitioning of night sap flow into refilling of internal water storage and transpiration in A.mangium.Sap flow of trees was monitored continuously with Granier's sensors for estimating whole-tree transpiration.Night sap flow data were used to calculate trunk water recharge.Possible night transpiration and stomatal conductance at leaf level in the canopy were measured with a Li-6400 photosynthesis measuring system.Important findings Vapor pressure deficit(VPD) and wind speed(V) could not fully explain sap flow in A.mangium at night(night leaf transpiration and stomatal conductance were weak).Therefore,night 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,the error caused by night water recharge on whole-tree transpiration was negligible.The mechanisms and ecological implications of night sap flow partitioning of A.mangium deserve further investigation.
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