Partitioning of evapotranspiration and its controls in four grassland ecosystems: Application of a two-source model

Hu, Zhongmin; Yu, Guirui; Zhou, Yanlian; Sun, Xiaomin; Li, Yingnian; Shi, Peili; Wang, Yanfen; Song, Xinshan; Zheng, Zhoutao; Li, Zhang; Li, Shenggong

doi:10.1016/j.agrformet.2009.03.014

Cited by 248 publications

(206 citation statements)

References 35 publications

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“…The calculations of each resistances were described in the previous study (Shuttleworth and Wallace, 1985) in detail. In a recent study, Hu et al (2009) revised the expressions of soil surface resistance (r ss ) and the canopy stomatal resistance (r sT ). r ss was calculated as the function of soil water content (S wc ):…”

Section: Model Description and Parameterizationsmentioning

confidence: 99%

“…b 1 , b 2 , b 3 were empirical constants.r sT was calculated using a modified Ball-Berry model (Hu et al, 2009;Wang and Leuning, 1998) as:…”

Section: Model Description and Parameterizationsmentioning

confidence: 99%

“…Shuttleworth-Wallace model (S-W model) is the first model designed for ET partition, which is a physically-based combination model based on Penman-Monteith equation (Shuttleworth and Wallace, 1985). S-W model has also been regarded as an accurate model and the foundation of other ET partition models, which provides a validation for other models (Kool et al, 2014) and has been widely used (Hu et al, 2009;Iritz et al, 2001;Kato et al, 2004), while there have been no attempt in using S-W model to partition ET into its components at forests of China, which occupied an important portion in global forests (FAO, 2010). China has conducted eddy covariance measurements since 2003 at three forests along the north-south transect of Eastern China (NSTEC), which experiences apparent decreasing temperature and precipitation gradients with the increasing latitude .…”

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal variations of T/ET (the ratio of transpiration to evapotranspiration) in three forests of Eastern China

Zhu

et al. 2015

Ecological Indicators

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The ratio of transpiration to evapotranspiration (T/ET) Forest a b s t r a c t Evapotranspiration (ET), which is comprised by evaporation from soil surface (E), transpiration (T) and evaporation from the intercepted water by canopy (EI), plays an important role in maintaining global energy balance and regulating climate. Quantifying the spatiotemporal variations of T/ET (the ratio of T to ET) can improve our understandings on the role of vegetation ecophysiological processes in climate regulation. Using eddy covariance measurements at three forest ecosystems (Changbaishan temperate broad-leaved Korean pine mixed forest (CBS), Qianyanzhou subtropical coniferous plantation (QYZ) and Dinghushan subtropical evergreen mixed forest (DHS)) in north-south transect of Eastern China (NSTEC), we run the revised Shuttleworth-Wallace model (S-W model), validated its performance with the water vapor fluxes measured at two layers, and quantified the spatiotemporal variations of T/ET. The S-W model performed well in simulating ET and T/ET. The mean value of annual T/ET at three forests during the observation period all exceeded 0.6. The diurnal variation of canopy stomal conductance (G c ) dominated that of T/ET. The seasonal dynamics of T/ET was mainly shaped by that of leaf area index (LAI), vapor pressure deficit (VPD) and air temperature (T a ) through altering G c and the portion that the energy absorbed by canopy (P EC ) at temperate forest (CBS), while the seasonal dynamics of T/ET at subtropical forests (QYZ and DHS) were mainly affected by T a , net radiation, VPD, and soil water content through altering G c and soil surface conductance (G s ). The variation of mean annual G c governed the interannual varaition and spatial variation of T/ET. Therefore, forests in Eastern China played an important role in regulating climate through T and G c primarily affected the spatial and temproal variations of the role of forest T in regulating climate.

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Section: Model Description and Parameterizationsmentioning

confidence: 99%

“…b 1 , b 2 , b 3 were empirical constants.r sT was calculated using a modified Ball-Berry model (Hu et al, 2009;Wang and Leuning, 1998) as:…”

Section: Model Description and Parameterizationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal variations of T/ET (the ratio of transpiration to evapotranspiration) in three forests of Eastern China

Zhu

et al. 2015

Ecological Indicators

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“…The respective parameters for both land surface types were estimated by a combination from the in-situ measurements and laboratory investigation of soil characteristics (Chen et al 2012). Surface emissivity, leaf area index and minimum stomatal resistance have been derived from various sources Hu et al 2009;Alapaty et al 1997) …”

Section: Adaptation Of Sewabmentioning

confidence: 99%

Turbulent flux observations and modelling over a shallow lake and a wet grassland in the Nam Co basin, Tibetan Plateau

Biermann

Babel

et al. 2013

Theor Appl Climatol

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The Tibetan Plateau plays an important role in the global water cycle and is strongly influenced by climate change. While energy and matter fluxes have been more intensely studied over land surfaces, a large proportion of lakes have either been neglected or parameterised with simple bulk approaches. Therefore, turbulent fluxes were measured over wet grassland and a shallow lake with a single eddy-covariance complex at the shoreline in the Nam Co basin in summer 2009. Footprint analysis was used to split observations according to the underlying surface, and two sophisticated surface models were utilised to derive gap-free time series. Results were then compared with observations and simulations from a nearby eddy-covariance station over dry grassland, yielding pronounced differences. Observations and footprint integrated simulations compared well, even for situations with flux contributions including grassland and lake. The accessibility problem for EC measurements on lakes can be overcome by combining standard meteorological measurements at the shoreline with model simulations, only requiring representative estimates of lake surface temperature.

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“…The role of soil water content Tang et al, 2014) and air condition in the seasonal dynamics of ET and the relative contributions of ecological responses and climate variation in ET interannual varitions were also clarified. In addition, based on measured ET, ChinaFLUX also revised the Shuttleworth-Wallace model and applied it in forests and grasslands (Hu et al, 2009;Hu et al, 2013;. ET components were also separated with hydrogen and oxygen isotope from isotope online observations, which provides a critical tool to reveal the variations of ET components (Hu et al, 2014).…”

Section: The Spatio-temporal Variations Of Ecosystem Evapotranspiratimentioning

confidence: 99%

Construction and progress of Chinese terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation

Wang

Chen

et al. 2016

J. Geogr. Sci.

Self Cite

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Eddy Covariance technique (EC) achieves the direct measurement on ecosystem carbon, nitrogen and water fluxes, and it provides scientific data for accurately assessing ecosystem functions in mitigating global climate change. This paper briefly reviewed the construction and development of Chinese terrestrial ecosystem flux observation and research network (ChinaFLUX), and systematically introduced the design principle and technology of the terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation system of ChinaFLUX. In addition, this paper summarized the main progress of ChinaFLUX in the ecosystem carbon, nitrogen and water exchange and environmental controlling mechanisms, the spatial pattern of carbon, nitrogen and water fluxes and biogeographical mechanisms, and the regional terrestrial ecosystem carbon budget assessment. Finally, the prospects and emphases of the terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation of ChinaFLUX are put forward to provide theoretical references for the development of flux observation and research in China.

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Partitioning of evapotranspiration and its controls in four grassland ecosystems: Application of a two-source model

Cited by 248 publications

References 35 publications

Spatiotemporal variations of T/ET (the ratio of transpiration to evapotranspiration) in three forests of Eastern China

Spatiotemporal variations of T/ET (the ratio of transpiration to evapotranspiration) in three forests of Eastern China

Turbulent flux observations and modelling over a shallow lake and a wet grassland in the Nam Co basin, Tibetan Plateau

Construction and progress of Chinese terrestrial ecosystem carbon, nitrogen and water fluxes coordinated observation

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