Partitioning evapotranspiration based on the concept of underlying water use efficiency
Abstract
Evapotranspiration (ET) is dominated by transpiration (T) in the terrestrial water cycle. However, continuous measurement of transpiration is still difficult, and the effect of vegetation on ET partitioning is unclear. The concept of underlying water use efficiency (uWUE) was used to develop a new method for ET partitioning by assuming that the maximum, or the potential uWUE is related to T while the averaged or apparent uWUE is related to ET. T/ET was thus estimated as the ratio of the apparent over the potential uWUE using half-hourly flux data from 17 AmeriFlux sites. The estimated potential uWUE was shown to be essentially constant for 14 of the 17 sites, and was broadly consistent with the uWUE evaluated at the leaf scale. The annual T/ET was the highest for croplands, i.e., 0.69 for corn and 0.62 for soybean, followed by grasslands (0.60) and evergreen needle leaf forests (0.56), and was the lowest for deciduous broadleaf forests (0.52). The enhanced vegetation index (EVI) was shown to be significantly correlated with T/ET and could explain about 75% of the variation in T/ET among the 71 site-years. The coefficients of determination between EVI and T/ET were 0.84 and 0.82 for corn and soybean, respectively,more »
- Authors:
-
- Tsinghua Univ., Beijing (China)
- Griffith Univ., Nathan, Queensland (Australia)
- Univ. of Oklahoma, Norman, OK (United States)
- Tsinghua Univ., Beijing (China); Qinghai Univ., Xining, Qinghai (China)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 1580858
- Grant/Contract Number:
- AC02-05CH11231; 91125018; 2013BAB05B03; 201301081
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Water Resources Research
- Additional Journal Information:
- Journal Volume: 52; Journal Issue: 2; Journal ID: ISSN 0043-1397
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; ET partitioning; underlying water use efficiency; vegetation control
Citation Formats
Zhou, Sha, Yu, Bofu, Zhang, Yao, Huang, Yuefei, and Wang, Guangqian. Partitioning evapotranspiration based on the concept of underlying water use efficiency. United States: N. p., 2016.
Web. doi:10.1002/2015wr017766.
Zhou, Sha, Yu, Bofu, Zhang, Yao, Huang, Yuefei, & Wang, Guangqian. Partitioning evapotranspiration based on the concept of underlying water use efficiency. United States. https://doi.org/10.1002/2015wr017766
Zhou, Sha, Yu, Bofu, Zhang, Yao, Huang, Yuefei, and Wang, Guangqian. Mon .
"Partitioning evapotranspiration based on the concept of underlying water use efficiency". United States. https://doi.org/10.1002/2015wr017766. https://www.osti.gov/servlets/purl/1580858.
@article{osti_1580858,
title = {Partitioning evapotranspiration based on the concept of underlying water use efficiency},
author = {Zhou, Sha and Yu, Bofu and Zhang, Yao and Huang, Yuefei and Wang, Guangqian},
abstractNote = {Evapotranspiration (ET) is dominated by transpiration (T) in the terrestrial water cycle. However, continuous measurement of transpiration is still difficult, and the effect of vegetation on ET partitioning is unclear. The concept of underlying water use efficiency (uWUE) was used to develop a new method for ET partitioning by assuming that the maximum, or the potential uWUE is related to T while the averaged or apparent uWUE is related to ET. T/ET was thus estimated as the ratio of the apparent over the potential uWUE using half-hourly flux data from 17 AmeriFlux sites. The estimated potential uWUE was shown to be essentially constant for 14 of the 17 sites, and was broadly consistent with the uWUE evaluated at the leaf scale. The annual T/ET was the highest for croplands, i.e., 0.69 for corn and 0.62 for soybean, followed by grasslands (0.60) and evergreen needle leaf forests (0.56), and was the lowest for deciduous broadleaf forests (0.52). The enhanced vegetation index (EVI) was shown to be significantly correlated with T/ET and could explain about 75% of the variation in T/ET among the 71 site-years. The coefficients of determination between EVI and T/ET were 0.84 and 0.82 for corn and soybean, respectively, and 0.77 for deciduous broadleaf forests and grasslands, but only 0.37 for evergreen needle leaf forests. This ET partitioning method is sound in principle and simple to apply in practice, and would enhance the value and role of global FLUXNET in estimating T/ET variations and monitoring ecosystem dynamics.},
doi = {10.1002/2015wr017766},
journal = {Water Resources Research},
number = 2,
volume = 52,
place = {United States},
year = {Mon Feb 08 00:00:00 EST 2016},
month = {Mon Feb 08 00:00:00 EST 2016}
}
Web of Science
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