Long term trends of stand transpiration in a remnant forest during wet and dry years

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dc.contributor.author Zeppel, MJB
dc.contributor.author Macinnis-Ng, CMO
dc.contributor.author Yunusa, IAM
dc.contributor.author Whitley, RJ
dc.contributor.author Eamus, D
dc.date.accessioned 2010-05-28T09:44:08Z
dc.date.issued 2008-01-30
dc.identifier.citation Journal of Hydrology, 2008, 349 (1-2), pp. 200 - 213
dc.identifier.issn 0022-1694
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/8577
dc.description.abstract Daily and annual rates of stand transpiration in a drought year and a non-drought year are compared in order to understand the adaptive responses of a remnant woodland to drought and predict the effect of land use change. Two methods were used to estimate stand transpiration. In the first, the ratio of sap velocity of a few trees measured for several hundred days to the mean sap velocity of many trees measured during brief sampling periods (generally 6-7 trees for 5 or 6 days), called the Esv method is used to scale temporally from the few intensive study periods. The second method used was the Penman-Monteith (P-M) equation (called the EPM method). Weather variables and soil moisture were used to predict canopy conductance, which in turn was used to predict daily and annual stand transpiration. Comparisons of daily transpiration estimated with the two methods showed larger values for the EPM method during a drought year and smaller values for the EPM when the rainfall was above average. Generally, though, annual estimates of stand transpiration were similar using the two methods. The Esv method produced an estimate of 318 mm (61% of rainfall) in the drought year and 443 mm (42%) in the year having above average rainfall. The EPM method estimated stand transpiration as 379 mm (73%) and 398 mm (37%), respectively, for the two years. Both estimates of annual stand transpiration demonstrated that the remnant forest showed resilience to an extreme and long-term drought. More importantly, the annual estimates showed that in dry years a larger proportion of rainfall was used as transpiration, and groundwater recharge was absent but in years with above average rainfall recharge was significantly increased. Changes in leaf area index were minimal between years and changes in stomatal conductance were the dominant mechanism for adapting to the drought. The remnant forest rapidly responded to increased water availability after the drought through a new flush of leaves and increased stomatal conductance. © 2007 Elsevier B.V. All rights reserved.
dc.language eng
dc.relation.hasversion Accepted manuscript version en_US
dc.relation.isbasedon 10.1016/j.jhydrol.2007.11.001
dc.title Long term trends of stand transpiration in a remnant forest during wet and dry years
dc.type Journal Article
dc.parent Journal of Hydrology
dc.journal.volume 1-2
dc.journal.volume 349
dc.journal.number en_US
dc.publocation Amsterdam, Netherlands en_US
dc.identifier.startpage 200 en_US
dc.identifier.endpage 213 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.for 0502 Environmental Science and Management
dc.personcode 000006
dc.personcode 980151
dc.personcode 030005
dc.personcode 034078
dc.personcode 996928
dc.percentage 50 en_US
dc.classification.name Ecology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity ISI:000253002900018 en_US
dc.description.keywords Annual water use
dc.description.keywords Heat pulse method
dc.description.keywords Sap flow
dc.description.keywords Stand transpiration
dc.description.keywords Tree water use
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Open Access
utslib.copyright.date 2015-04-15 12:23:47.074767+10
pubs.consider-herdc true
utslib.collection.history School of the Environment (ID: 344)
utslib.collection.history General (ID: 2)

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