IGSNRR OpenIR
Evapotranspiration partitioning for three agro-ecosystems with contrasting moisture conditions: a comparison of an isotope method and a two-source model calculation
Wei, Zhongwang1,2; Lee, Xuhui1,2; Wen, Xuefa3; Xiao, Wei1
2018-04-15
Source PublicationAGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
Volume252Pages:296-310
Corresponding AuthorWei, Zhongwang(zhongwang.wei@yale.edu) ; Lee, Xuhui(xuhui.lee@yale.edu)
AbstractQuantification of the contribution of transpiration (T) to evapotranspiration (ET) is a requirement for understanding changes in carbon assimilation and water cycling in a changing environment. So far, few studies have examined seasonal variability of T/ET and compared different ET partitioning methods under natural conditions across diverse agro-ecosystems. In this study, we apply a two-source model to partition ET for three agro-ecosystems (rice, wheat and corn). The model is coupled with a plant physiology scheme for the canopy conductance. The model-estimated T/ET ranges from 0 to 1, with a near continuous increase over time in the early growing season when leaf area index (LAI) is less than 2.5 and then convergence towards a stable value beyond LAI of 2.5. The seasonal change in T/ET can be described well as a function of LAI, implying that LAI is a first order factor affecting ET partitioning. Application of the model to seven other Ameriflux sites reveals that soil moisture and canopy conductance also influence the ET partitioning. The two-source model results show that the growing-season (May-September for rice, April-June for wheat and June-September for corn) T/ET is 0.50, 0.84 and 0.64, while an isotopic approach shows that T/ET is 0.74, 0.93 and 0.81 for rice, wheat and maize, respectively. The two-source model results are supported by soil lysimeter and eddy covariance measurements made during the same time period for wheat (0.87). Uncertainty analysis suggests that further improvements to the Craig-Gordon model prediction of the evaporation isotope composition and to measurement of the isotopic composition of ET are necessary to achieve accurate flux partitioning at the ecosystem scale using water isotopes as tracers.
KeywordAgro-ecosystems Evapotranspiration partitioning Isotope Two-source model
DOI10.1016/j.agrformet.2018.01.019
WOS KeywordTERRESTRIAL WATER FLUXES ; WINTER-WHEAT FIELD ; STABLE-ISOTOPES ; LAND-SURFACE ; EDDY-COVARIANCE ; OXYGEN-ISOTOPE ; GAS-EXCHANGE ; STATE TRANSPIRATION ; TEMPERATE GRASSLAND ; CANOPY CONDUCTANCE
Indexed BySCI
Language英语
Funding ProjectU.S. National Science Foundation[AGS-1520684] ; National Natural Science Foundation of China[41475141] ; National Natural Science Foundation of China[41505005] ; National Natural Science Foundation of China[31100359]
Funding OrganizationU.S. National Science Foundation ; National Natural Science Foundation of China
WOS Research AreaAgriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS SubjectAgronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS IDWOS:000427341400026
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/57351
Collection中国科学院地理科学与资源研究所
Corresponding AuthorWei, Zhongwang; Lee, Xuhui
Affiliation1.Nanjing Univ Informat Sci & Technol, Yale NUIST Ctr Atmospher Environm, Nanjing, Jiangsu, Peoples R China
2.Yale Univ, Sch Forestry & Environm Studies, New Haven, CT 06520 USA
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Wei, Zhongwang,Lee, Xuhui,Wen, Xuefa,et al. Evapotranspiration partitioning for three agro-ecosystems with contrasting moisture conditions: a comparison of an isotope method and a two-source model calculation[J]. AGRICULTURAL AND FOREST METEOROLOGY,2018,252:296-310.
APA Wei, Zhongwang,Lee, Xuhui,Wen, Xuefa,&Xiao, Wei.(2018).Evapotranspiration partitioning for three agro-ecosystems with contrasting moisture conditions: a comparison of an isotope method and a two-source model calculation.AGRICULTURAL AND FOREST METEOROLOGY,252,296-310.
MLA Wei, Zhongwang,et al."Evapotranspiration partitioning for three agro-ecosystems with contrasting moisture conditions: a comparison of an isotope method and a two-source model calculation".AGRICULTURAL AND FOREST METEOROLOGY 252(2018):296-310.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wei, Zhongwang]'s Articles
[Lee, Xuhui]'s Articles
[Wen, Xuefa]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wei, Zhongwang]'s Articles
[Lee, Xuhui]'s Articles
[Wen, Xuefa]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wei, Zhongwang]'s Articles
[Lee, Xuhui]'s Articles
[Wen, Xuefa]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.