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Nighttime sap flow of Acacia mangium and its implications for nighttime transpiration and stem water storage

文献类型： 外文期刊

作者： Wang, Hua 1 ; Zhao, Ping 1 ; Hoelscher, Dirk 4 ; Wang, Quan 5 ; Lu, Ping 6 ; Cai, Xi A. 1 ; Zeng, Xiao P. 1 ;

作者机构： 1.Chinese Acad Sci, S China Inst Bot, Guangzhou 510650, Guangdong, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Forestry & Pomol, Beijing 100093, Peoples R China

3.Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China

4.Univ Gottingen, Dept Trop Silviculture & Forest Ecol, D-37077 Gottingen, Germany

5.Shizuoka Univ, Fac Agr, Shizuoka 4228529, Japan

6.Energy Resources Australia Ltd, Darwin, NT 0801, Australia

关键词： heat dissipation method;nighttime sap flow;nighttime leaf transpiration;stem water recharge

期刊名称：JOURNAL OF PLANT ECOLOGY （ 影响因子：1.774； 五年影响因子：2.547 ）

ISSN： 1752-9921

年卷期： 2012 年 5 卷 3 期

页码：

收录情况： SCI

摘要： Nighttime sap flow of trees may indicate transpiration and/or recharge of stem water storage at night. This paper deals with the water use of Acacia mangium at night in the hilly lands of subtropical South China. Our primary goal was to reveal and understand the nature of nighttime sap flow and its functional significance. Granier's thermal dissipation method was used to determine the nighttime sap flux of A. mangium. Gas exchange system was used to estimate nighttime leaf transpiration and stomatal conductance of studied trees. Nighttime sap flow was substantial and showed seasonal variation similar to the patterns of daytime sap flow in A. mangium. Mean nighttime sap flow was higher in the less precipitation year of 2004 (1122.4 mm) than in the more precipitation year of 2005 (1342.5 mm) since more daytime transpiration and low soil water availability in the relatively dry 2004 can be the cause of more nighttime sap flow. Although vapor pressure deficit and air temperature were significantly correlated with nighttime sap flow, they could only explain a small fraction of the variance in nighttime sap flow. The total accumulated water loss (E-L) by transpiration of canopy leaves was only similar to 2.6-8.5% of the total nighttime sap flow (E-t) during the nights of July 17-18 and 18-19, 2006. Therefore, it is likely that the nighttime sap flow was mainly used for refilling water in the trunk. The stem diameter at breast height, basal area and sapwood area explained much more variance of nighttime water recharge than environmental factors and other tree form features, such as tree height, stem length below the branch, and canopy size. The contribution of nighttime water recharge to the total transpiration ranged from 14.7 to 30.3% depending on different DBH class and was considerably higher in the dry season compared to the wet season.

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