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

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 水污染控制实验室

	Nighttime sap flow of Acacia mangium and its implications for nighttime transpiration and stem water storage
	Wang, Hua ; Zhao, Ping ; Hoelscher, Dirk ; Wang, Quan ; Lu, Ping ; Cai, Xi A. ; Zeng, Xiao P.
刊名	Plant Sciences; Environmental Sciences & Ecology
	2012
卷号	5 期号:3 页码:294-304
关键词	heat dissipation method nighttime sap flow nighttime leaf transpiration stem water recharge
ISSN号	1752-9921
中文摘要	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.
WOS记录号	WOS:000306371700006
公开日期	2014-11-28
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/8183]
专题	生态环境研究中心_水污染控制实验室
推荐引用方式 GB/T 7714	Wang, Hua,Zhao, Ping,Hoelscher, Dirk,et al. Nighttime sap flow of Acacia mangium and its implications for nighttime transpiration and stem water storage[J]. Plant Sciences; Environmental Sciences & Ecology,2012,5(3):294-304.
APA	Wang, Hua.,Zhao, Ping.,Hoelscher, Dirk.,Wang, Quan.,Lu, Ping.,...&Zeng, Xiao P..(2012).Nighttime sap flow of Acacia mangium and its implications for nighttime transpiration and stem water storage.Plant Sciences; Environmental Sciences & Ecology,5(3),294-304.
MLA	Wang, Hua,et al."Nighttime sap flow of Acacia mangium and its implications for nighttime transpiration and stem water storage".Plant Sciences; Environmental Sciences & Ecology 5.3(2012):294-304.