Water, heat fluxes and water use efficiency measurement and modeling above a farmland in the North China Plain

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dc.contributor.author Qin, Z
dc.contributor.author Yu, Q
dc.contributor.author Xu, S
dc.contributor.author Hu, B
dc.contributor.author Sun, X
dc.contributor.author Liu, E
dc.contributor.author Wang, J
dc.contributor.author Yu, G
dc.contributor.author Zhu, Z
dc.date.accessioned 2010-05-28T09:43:50Z
dc.date.issued 2005-01
dc.identifier.citation Science in China Series D Earth Science, 2005, 48 (1), pp. 207 - 217
dc.identifier.issn 1006-9313
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/8538
dc.description.abstract Abstract: Net radiation (Rn), water vapor flux (LE), sensible heat flux (Hs) and soil heat flux (G) were measured above a summer maize field with the eddy-covariance technique, simulation and analysis of water, heat fluxes and crop water use efficiency were made with the RZ-SHAW model at the same time in this study. The results revealed significant diurnal and seasonal variability of water vapor flux for summer maize. Most part of Rn was consumed by the evapotranspiration of the summer maize. The proportion of water vapor flux to net radiation ((LE/Rn) increased with the crop development and peaked around milk-filling stage with a value of 60%, a slightly lower than that obtained by the RZ-SHAW model. Daily evapotranspiration estimated by the model agreed with the results measured with the eddy-covariance technique, indices of agreement (IA) for hourly water vapor fluxes simulated and measured were above 0.75, root mean square errors (RMSE) were no more than 1.0. Diurnal patterns of Hs showed the shape of inverted "U" shifted to the forenoon with a maximum value around 11:30 (Beijing time), while LE exhibited an inverted "V" with a maximum value at around 13:00, about an hour later than Hs. Diurnal change of CO2 showed an asymmetrical "V" curve and its maximal rates occurred at about 11:30. Variations of water use efficiency during the phonological stages of the summer maize showed a rapid increase with the photosynthetic photon flux density (PPFD) after sunrise, a state of equilibrium around 10:00 followed a decrease. Maximum values of water use efficiency were 24.3, and its average value ranged from 7.6 to 10.3 g kg-1.
dc.publisher Zhongguo Kexue Zazhishe
dc.title Water, heat fluxes and water use efficiency measurement and modeling above a farmland in the North China Plain
dc.type Journal Article
dc.parent Science in China Series D Earth Science
dc.journal.volume 1
dc.journal.volume 48
dc.journal.number 1 en_US
dc.publocation China en_US
dc.identifier.startpage 207 en_US
dc.identifier.endpage 217 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 040608 Surfacewater Hydrology
dc.personcode 107001
dc.percentage 100 en_US
dc.classification.name Surfacewater Hydrology 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 en_US
dc.description.keywords water vapor flux CO2 flux water use efficiency RZ-SHAW model maize North China Plain en_US
dc.description.keywords water vapor flux CO2 flux water use efficiency RZ-SHAW model maize North China Plain
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 Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
utslib.collection.history Closed (ID: 3)
utslib.collection.history Uncategorised (ID: 363)


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