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

Journal of Plant Ecology 2012年第3期5卷 294-304页

作者： Hua Wang Ping Zhao Dirk Hölscher Quan Wang Ping Lu Xi A.Cai Xiao P.Zeng South China Institute of Botany Chinese Academy of SciencesGuangzhou 510650China Institute of Forestry and Pomology Beijing Academy of Agriculture and Forestry SciencesBeijing 100093China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Department of Tropical Silviculture and Forest Ecology University of Göttingen37077 GöttingenGermany Faculty of Agriculture Shizuoka UniversityShizuoka 422-8529Japan Energy Resources of Australia Ltd GPO Box 2394DarwinNorthern Territory0801Australia

Aims Nighttime sap flow of trees may indicate transpiration and/or recharge of stem water storage at *** paper deals with the water use of Acacia mangium at night in the hilly lands of subtropical South *** primary goal was to reveal and understand the nature of nighttime sap flow and its functional *** Granier’s thermal dissipation method was used to determine the nighttime sap flux of *** exchange system was used to estimate nighttime leaf transpiration and stomatal conductance of studied *** Findings Nighttimesap flowwas substantial and showed seasonal variation similar to the patterns of daytime sap flowin *** 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 *** 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 *** total accumulated water loss(E_(L))by transpiration of canopy leaves was only;2.6–8.5%of the total nighttime sap flow(E_(t))during the nights of July 17–18 and 18–19,***,it is likely that the nighttime sap flow was mainly used for refillingwater in 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 *** 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.

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

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