NWIPB OpenIR
Hysteresis Responses of Evapotranspiration to Meteorological Factors at a Diel Timescale: Patterns and Causes
Zheng, Han1,3; Wang, Qiufeng1; Zhu, Xianjin1,3; Li, Yingnian2; Yu, Guirui1
2014-06-04
发表期刊PLOS ONE
ISSN1932-6203
卷号9期号:6
文章类型Article
摘要Evapotranspiration (ET) is an important component of the water cycle in terrestrial ecosystems. Understanding the ways in which ET changes with meteorological factors is central to a better understanding of ecological and hydrological processes. In this study, we used eddy covariance measurements of ET from a typical alpine shrubland meadow ecosystem in China to investigate the hysteresis response of ET to environmental variables including air temperature (T-a), vapor pressure deficit (VPD) and net radiation (R-n) at a diel timescale. Meanwhile, the simulated ET by Priestly-Taylor equation was used to interpret the measured ET under well-watered conditions. Pronounced hysteresis was observed in both T-a and VPD response curves of ET. At a similar T-a and VPD, ET was always significantly depressed in the afternoon compared with the morning. But the hysteresis response of ET to R-n was not evident. Similar hysteresis patterns were also observed in the T-a/ VPD response curves of simulated ET. The magnitudes of the measured and simulated hysteresis loops showed similar seasonal variation, with relatively smaller values occurring from May to September, which agreed well with the lifetime of plants and the period of rainy season at this site. About 62% and 23% of changes in the strength of measured ET-T-a and ET-VPD loops could be explained by the changes in the strength of simulated loops, respectively. Thus, the time lag between R-n and T-a/VPD is the most important factor generating and modulating the ET-T-a/VPD hysteresis, but plants and water status also contribute to the hysteresis response of ET. Our research confirmed the different hysteresis in the responses of ET to meteorological factors and proved the vital role of Rn in driving the diel course of ET.; Evapotranspiration (ET) is an important component of the water cycle in terrestrial ecosystems. Understanding the ways in which ET changes with meteorological factors is central to a better understanding of ecological and hydrological processes. In this study, we used eddy covariance measurements of ET from a typical alpine shrubland meadow ecosystem in China to investigate the hysteresis response of ET to environmental variables including air temperature (T-a), vapor pressure deficit (VPD) and net radiation (R-n) at a diel timescale. Meanwhile, the simulated ET by Priestly-Taylor equation was used to interpret the measured ET under well-watered conditions. Pronounced hysteresis was observed in both T-a and VPD response curves of ET. At a similar T-a and VPD, ET was always significantly depressed in the afternoon compared with the morning. But the hysteresis response of ET to R-n was not evident. Similar hysteresis patterns were also observed in the T-a/ VPD response curves of simulated ET. The magnitudes of the measured and simulated hysteresis loops showed similar seasonal variation, with relatively smaller values occurring from May to September, which agreed well with the lifetime of plants and the period of rainy season at this site. About 62% and 23% of changes in the strength of measured ET-T-a and ET-VPD loops could be explained by the changes in the strength of simulated loops, respectively. Thus, the time lag between R-n and T-a/VPD is the most important factor generating and modulating the ET-T-a/VPD hysteresis, but plants and water status also contribute to the hysteresis response of ET. Our research confirmed the different hysteresis in the responses of ET to meteorological factors and proved the vital role of Rn in driving the diel course of ET.
WOS标题词Science & Technology
关键词[WOS]NET ECOSYSTEM EXCHANGE ; TIBETAN PLATEAU ; CARBON-DIOXIDE ; WATER-VAPOR ; TRANSPIRATION ; AUSTRALIA ; FLUX ; CHINA ; ASSIMILATION ; CONDUCTANCE
收录类别SCI
语种英语
WOS研究方向Science & Technology - Other Topics
WOS类目Multidisciplinary Sciences
WOS记录号WOS:000338430700087
引用统计
被引频次:45[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/4222
专题中国科学院西北高原生物研究所
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Synth Res Ctr,Chinese Ecosyst Res Network, Beijing, Peoples R China
2.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714
Zheng, Han,Wang, Qiufeng,Zhu, Xianjin,et al. Hysteresis Responses of Evapotranspiration to Meteorological Factors at a Diel Timescale: Patterns and Causes[J]. PLOS ONE,2014,9(6).
APA Zheng, Han,Wang, Qiufeng,Zhu, Xianjin,Li, Yingnian,&Yu, Guirui.(2014).Hysteresis Responses of Evapotranspiration to Meteorological Factors at a Diel Timescale: Patterns and Causes.PLOS ONE,9(6).
MLA Zheng, Han,et al."Hysteresis Responses of Evapotranspiration to Meteorological Factors at a Diel Timescale: Patterns and Causes".PLOS ONE 9.6(2014).
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