Quantifying the effects of elevated CO<inf>2</inf> on water budgets by combining FACE data with an ecohydrological model

Cheng, L; Zhang, L; Wang, YP; Yu, Q; Eamus, D

Quantifying the effects of elevated CO<inf>2</inf> on water budgets by combining FACE data with an ecohydrological model

Cheng, L Zhang, L Wang, YP Yu, Q Eamus, D

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Publication Type:: Journal Article
Citation:: Ecohydrology, 2014, 7 (6), pp. 1574 - 1588
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Cheng, L	en_US
dc.contributor.author	Zhang, L	en_US
dc.contributor.author	Wang, YP	en_US
dc.contributor.author	Yu, Q	en_US
dc.contributor.author	Eamus, D	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Ecohydrology, 2014, 7 (6), pp. 1574 - 1588	en_US
dc.identifier.issn	1936-0584	en_US
dc.identifier.uri	http://hdl.handle.net/10453/35875
dc.description.abstract	© 2014 John Wiley & Sons, Ltd. Response of leaf area index (LAI) is the key determinant for predicting impacts of the elevated CO 2 (eCO 2 ) on water budgets. Importance of the changes in functional attributes of vegetation associated with eCO 2 for predicting responses of LAI has rarely been addressed. In this study, the WAter Vegetation Energy and Solute (WAVES) model was applied to simulate ecohydrological effects of the eCO 2 at two free-air CO 2 enrichment (FACE) experimental sites with contrasting vegetation. One was carried out by the Oak Ridge National Laboratory on the forest (ORNL FACE). The other one was conducted by the University of Minnesota on the grass (BioCON FACE). Results demonstrated that changes in functional attributes of vegetation (including reduction in specific leaf area, changes in carbon assimilation and allocation characteristics) and availability of nutrients are important for reproducing the responses of LAI, transpiration and soil moisture at both sites. Predicted LAI increased slightly at both sites because of fertilization effects of the eCO 2 . Simulated transpiration decreased 10·5% at ORNL site and 13·8% at BioCON site because of reduction in the stomatal conductance. Predicted evaporation from interception and soil surface increased slightly ( < 1·0mmyear -1 ) at both sites because of increased LAI and litter production, and increased soil moisture resulted from reduced transpiration. All components of run-off were predicted to increase because of significant decrease in transpiration. Simulated mean annual evapotranspiration decreased about 8·7% and 10·8%, and mean annual run-off increased about 11·1% (59·3mmyear -1 ) and 9·5% (37·6mmyear -1 ) at the ORNL and BioCON FACE sites, respectively.	en_US
dc.relation.ispartof	Ecohydrology	en_US
dc.relation.isbasedon	10.1002/eco.1478	en_US
dc.relation.isreplacedby	10453/115539
dc.relation.isreplacedby	http://hdl.handle.net/10453/115539
dc.title	Quantifying the effects of elevated CO<inf>2</inf> on water budgets by combining FACE data with an ecohydrological model	en_US
dc.type	Journal Article
utslib.citation.volume	6	en_US
utslib.citation.volume	7	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural And Veterinary Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	open_access
pubs.declined	1970-01-01T00:00:00.0+1000
pubs.merge-to	10453/115539
pubs.merge-to	http://hdl.handle.net/10453/115539
pubs.deleted	1970-01-01T00:00:00.0+1000
pubs.issue	6	en_US
pubs.publication-status	Published	en_US
pubs.volume	7	en_US

Abstract:

© 2014 John Wiley & Sons, Ltd. Response of leaf area index (LAI) is the key determinant for predicting impacts of the elevated CO 2 (eCO 2 ) on water budgets. Importance of the changes in functional attributes of vegetation associated with eCO 2 for predicting responses of LAI has rarely been addressed. In this study, the WAter Vegetation Energy and Solute (WAVES) model was applied to simulate ecohydrological effects of the eCO 2 at two free-air CO 2 enrichment (FACE) experimental sites with contrasting vegetation. One was carried out by the Oak Ridge National Laboratory on the forest (ORNL FACE). The other one was conducted by the University of Minnesota on the grass (BioCON FACE). Results demonstrated that changes in functional attributes of vegetation (including reduction in specific leaf area, changes in carbon assimilation and allocation characteristics) and availability of nutrients are important for reproducing the responses of LAI, transpiration and soil moisture at both sites. Predicted LAI increased slightly at both sites because of fertilization effects of the eCO 2 . Simulated transpiration decreased 10·5% at ORNL site and 13·8% at BioCON site because of reduction in the stomatal conductance. Predicted evaporation from interception and soil surface increased slightly ( < 1·0mmyear -1 ) at both sites because of increased LAI and litter production, and increased soil moisture resulted from reduced transpiration. All components of run-off were predicted to increase because of significant decrease in transpiration. Simulated mean annual evapotranspiration decreased about 8·7% and 10·8%, and mean annual run-off increased about 11·1% (59·3mmyear -1 ) and 9·5% (37·6mmyear -1 ) at the ORNL and BioCON FACE sites, respectively.

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http://hdl.handle.net/10453/35875