Riparian ecohydrology: Regulation of water flux from the ground to the atmosphere in the Middle Rio Grande, New Mexico

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Show simple item record Cleverly, JR Dahm, CN Thibault, JR McDonnell, DE Allred Coonrod, JE 2010-05-28T09:43:38Z 2006-10-15
dc.identifier.citation Hydrological Processes, 2006, 20 (15), pp. 3207 - 3225
dc.identifier.issn 0885-6087
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract During the previous decade, the south-western United States has faced declining water resources and escalating forest fires due to long-term regional drought. Competing demands for water resources require a careful accounting of the basin water budget. Water lost to the atmosphere through riparian evapotranspiration (ET) is believed to rank in the top third of water budget depletions. To better manage depletions in a large river system, patterns of riparian ET must be better understood. This paper provides a general overview of the ecological, hydrological, and atmospheric issues surrounding riparian ET in the Middle Rio Grande (MRG) of New Mexico. Long-term measurements of ET, water table depth, and micro-meteorological conditions have been made at sites dominated by native cottonwood (Populus deltoides) forests and non-native saltcedar (Tamarix chinensis) thickets along the MRG. Over periods longer than one week, groundwater and leaf area index (LAI) dynamics relate well with ET rates. Evapotranspiration from P. deltoides forests was unaffected by annual drought conditions in much of the MRG where the water table is maintained within 3 m of the surface. Evapotranspiration from a dense Tamarix chinensis thicket did not decline with increasing groundwater depth; instead, ET increased by 50%, from 6 mm/day to 9 mm/day, as the water table receded at nearly 7 cm/ day. Leaf area index of the T. chinensis thicket, likewise, increased during groundwater decline. Leaf area index can be manipulated as well following removal of non-native species. When T. chinensis and non-native Russian olive (Elaeagnus angustifolia) were removed from a P. deltoides understory, water salvaged through reduced ET was 26 cm/yr in relation to ET measured at reference sites. To investigate correlates to short-term variations in ET, stepwise multiple linear regression was used to evaluate atmospheric conditions under which ET is elevated or depressed. At the P. deltoides-dominated sites, ET anomalies were positively correlated to net radiation (Rn.) and negatively correlated to sensible heat flux (H), cross-corridor wind speed (v), and along-corridor wind speed (u) (r2 = 0.54). At the T. chinensis-dominated sites, ET anomalies were positively correlated with Rn, u, the friction coefficient (u*), and vapour pressure deficit (VPD) and were negatively correlated to surface humidity scale (q*), daily high and low temperature, H, and precipitation (r2 = 0.66). Both Tamarix and Populus can transpire prodigious quantities of water when conditions are favourable. In the MRG, T. chinensis is preferentially found where summer flooding and cold air drainage occurs, and P. deltoides is preferentially located in areas with shallow groundwater within 2 m of the surface. Copyright © 2006 John Wiley & Sons, Ltd.
dc.language eng
dc.relation.hasversion Accepted manuscript version en_US
dc.relation.isbasedon 10.1002/hyp.6328
dc.title Riparian ecohydrology: Regulation of water flux from the ground to the atmosphere in the Middle Rio Grande, New Mexico
dc.type Journal Article
dc.parent Hydrological Processes
dc.journal.volume 15
dc.journal.volume 20
dc.journal.number 15 en_US
dc.publocation United Kingdom en_US
dc.identifier.startpage 3207 en_US
dc.identifier.endpage 3225 en_US SCI.Plant Functional Biology & Climate Change en_US
dc.conference Verified OK en_US
dc.for 0502 Environmental Science and Management
dc.personcode 108525
dc.percentage 100 en_US Environmental Science and Management en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords Depth to groundwater
dc.description.keywords Eddy covariance
dc.description.keywords Evapotranspiration
dc.description.keywords Floodplain
dc.description.keywords Leaf area index
dc.description.keywords Micrometeorology
dc.description.keywords Phreatophytes
dc.description.keywords Rio Grande cottonwood
dc.description.keywords Russian olive
dc.description.keywords Saltcedar
dc.description.keywords Transpiration
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Open Access 2015-04-15 12:23:47.074767+10
pubs.consider-herdc false
utslib.collection.history School of the Environment (ID: 344)
utslib.collection.history General (ID: 2)

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