Evapotranspiration partitioning at the ecosystem scale using the stable isotope method—A review

Xiao, Wei; Wei, Zhongwang; Wen, Xuefa

doi:10.1016/j.agrformet.2018.09.005

Cited by 76 publications

(57 citation statements)

References 121 publications

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“…As part of the terrestrial water cycle, forests promote rainfall, cool surface temperatures, transport water across vast landscapes, and regulate water supplies (Ellison et al, 2017). Globally, vegetation recycles a tremendous amount of water to the atmosphere via transpiration; forests account for approximately 50% of this flux (Schlesinger & Jasechko, 2014;Xiao et al, 2018). However, as the frequency of environmental disturbances from natural and anthropogenic forces accelerate, forest hydrological cycles may change (Ellison et al, 2017;Pan et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Stable Water Isotopes Reveal Effects of Intermediate Disturbance and Canopy Structure on Forest Water Cycling

et al. 2019

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Forests play an integral role in the terrestrial water cycle and link exchanges of water between the land surface and the atmosphere. To examine the effects of an intermediate disturbance on forest water cycling, we compared vertical profiles of stable water vapor isotopes in two closely located forest sites in northern lower Michigan. At one site, all canopy‐dominant early successional species were stem girdled to induce mortality and accelerate senescence. At both sites, we measured the isotopic composition of atmospheric water vapor at six heights during three seasons (spring, summer, and fall) and paired vertical isotope profiles with local meteorology and sap flux. Disturbance had a substantial impact on local water cycling. The undisturbed canopy was moister, retained more transpired vapor, and at times was poorly mixed with the free atmosphere above the canopy. Differences between the disturbed and undisturbed sites were most pronounced in the summer when transpiration was high. Differences in forest structure at the two sites also led to more isotopically stratified vapor within the undisturbed canopy. Our findings suggest that intermediate disturbance may increase mixing between the surface layer and above‐canopy atmosphere and alter ecosystem‐atmosphere gas exchange.

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Section: Introductionmentioning

confidence: 99%

Stable Water Isotopes Reveal Effects of Intermediate Disturbance and Canopy Structure on Forest Water Cycling

et al. 2019

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“…We used the Craig and Gordon (1965) model (Equation ) to calculate δ E . Here, the challenging factors are an accurate and representative value for the isotopic composition of soil water at the evaporation front and the soil kinetic fractionation factor (Wang et al, 2013; Xiao et al, 2018). We collected soil from the top 10 cm and used δ s from a single location to estimate the evaporative flux over the entire tower footprint.…”

Section: Discussionmentioning

confidence: 99%

An isotopic approach to partition evapotranspiration in a mixed deciduous forest

et al. 2020

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Transpiration (T) is perhaps the largest fluxes of water from the land surface to the atmosphere and is susceptible to changes in climate, land use and vegetation structure. However, predictions of future transpiration fluxes vary widely and are poorly constrained. Stable water isotopes can help expand our understanding of land–atmosphere water fluxes but are limited by a lack of observations and a poor understanding of how the isotopic composition of transpired vapour (δT) varies. Here, we present isotopic data of water vapour, terrestrial water and plant water from a deciduous forest to understand how vegetation affects water budgets and land–atmosphere water fluxes. We measured subdiurnal variations of δ18OT from three tree species and used water isotopes to partition T from evapotranspiration (ET) to quantify the role of vegetation in the local water cycle. We find that δ18OT deviated from isotopic steady‐state during the day but find no species‐specific patterns. The ratio of T to ET varied from 53% to 61% and was generally invariant during the day, indicating that diurnal evaporation and transpiration fluxes respond to similar atmospheric and micrometeorological conditions at this site. Finally, we compared the isotope‐inferred ratio of T to ET with results from another ET partitioning approach that uses eddy covariance and sap flux data. We find broad midday agreement between these two partitioning techniques, in particular, the absence of a diurnal cycle, which should encourage future ecohydrological isotope studies. Isotope‐inferred estimates of transpiration can inform land surface models and improve our understanding of land–atmosphere water fluxes.

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“…This is more similar to PET but is still not actual evapotranspiration. One frequently used approach to solve this issue is isotope measurement [79][80][81][82][83][84]. The advantage of isotope measurement is its accuracy, while the disadvantages are that it is time-consuming and not suitable for large-scale problems.…”

Section: Discussionmentioning

confidence: 99%

Integration of Remote Sensing Evapotranspiration into Multi-Objective Calibration of Distributed Hydrology–Soil–Vegetation Model (DHSVM) in a Humid Region of China

Pan

Liu

Bai

et al. 2018

Water

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This study presents an approach that integrates remote sensing evapotranspiration into multi-objective calibration (i.e., runoff and evapotranspiration) of a fully distributed hydrological model, namely a distributed hydrology–soil–vegetation model (DHSVM). Because of the lack of a calibration module in the DHSVM, a multi-objective calibration module using ε-dominance non-dominated sorted genetic algorithm II (ε-NSGAII) and based on parallel computing of a Linux cluster for the DHSVM (εP-DHSVM) is developed. The module with DHSVM is applied to a humid river basin located in the mid-west of Zhejiang Province, east China. The results show that runoff is simulated well in single objective calibration, whereas evapotranspiration is not. By considering more variables in multi-objective calibration, DHSVM provides more reasonable simulation for both runoff (NS: 0.74% and PBIAS: 10.5%) and evapotranspiration (NS: 0.76% and PBIAS: 8.6%) and great reduction of equifinality, which illustrates the effect of remote sensing evapotranspiration integration in the calibration of hydrological models.

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Evapotranspiration partitioning at the ecosystem scale using the stable isotope method—A review

Cited by 76 publications

References 121 publications

Stable Water Isotopes Reveal Effects of Intermediate Disturbance and Canopy Structure on Forest Water Cycling

Stable Water Isotopes Reveal Effects of Intermediate Disturbance and Canopy Structure on Forest Water Cycling

An isotopic approach to partition evapotranspiration in a mixed deciduous forest

Integration of Remote Sensing Evapotranspiration into Multi-Objective Calibration of Distributed Hydrology–Soil–Vegetation Model (DHSVM) in a Humid Region of China

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