The effect of clumping and stomatal response on evaporation from sparsely vegetated shrublands

Brenner, Andrew; Incoll, L. D.

doi:10.1016/s0168-1923(96)02368-4

Cited by 97 publications

(92 citation statements)

References 32 publications

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“…Although these two source models account for evaporation from both plant and soil (evapotranspiration) they still assume a uniform canopy coverage. Brenner and Incoll (1997) extended the approach of Dolman (1993) by dividing the surface into vegetated and non-vegetated components, and allowed the substrate that existed underneath the overstory to act as a distinct evaporation source. Brenner and Incoll (1997) showed that this improved estimates of plant evaporation when compared to the Shuttleworth and Gurney formulation.…”

Section: Introductionmentioning

confidence: 99%

Evapotranspiration model for semi-arid shrub-lands tested against data from SE Spain

Domingo

Villagarcı́a

Brenner

et al. 1999

Agricultural and Forest Meteorology

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108

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A model was developed that predicted evaporation based on combined information on the physiology of overstorey and substrate, micrometeorological conditions and spatial distribution of plants. Predicted evapotranspiration was veri®ed at stand level for Retama sphaerocarpa shrubs, and model parameters were tested to determine their importance in controlling evaporation. Model predictions were compared with evapotranspiration, measured by a Bowen Ratio Energy Balance system (BREB), and transpiration, measured by sap¯ow of the stems of the shrubs in south eastern Spain. Modi®cations made to the original two source clumped model in the tested model signi®cantly improved agreement between predicted surface evapotranspiration rates and rates measured by the Bowen Ratio method. The modi®cations made to the model were improved parameterisation of soil surface conductance, a more detailed description of the radiation balance, and improved parameterisation of the soil aerodynamic conductance terms. Improvements in the soil surface conductance estimates made the most signi®cant change to model predictions, the second two modi®cations showed no signi®cant improvement in prediction of evapotranspiration. A sensitivity analysis indicated that relatively large variations of leaf area index or albedo caused little variation in evapotranspiration during the period measured, whereas variations in soil water content caused large changes in predicted evapotranspiration. Transpiration rates of shrubs (measured and modelled) indicated an independence from surface soil moisture (0±25 cm) supporting the view that R. sphaerocarpa had access to reserves of water deep in the soil which enabled it to survive and grow vigorously in this type of semiarid environment. Thus, it was concluded that land use changes which affect redistribution of water resources (overland and subsurface¯ow) may threaten the stability survival of R. sphaerocarpa stands. #

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Section: Introductionmentioning

confidence: 99%

Evapotranspiration model for semi-arid shrub-lands tested against data from SE Spain

Domingo

Villagarcı́a

Brenner

et al. 1999

Agricultural and Forest Meteorology

Self Cite

108

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“…The present work is included as part of an investigation of the processes controlling use of water by vegetation in sparse canopies in semi-arid environments (Brenner and Incoll, 1997;Domingo et al, 1991 andDomingo et al, 1996;Pugnaire and Haase, 1996;Sa Ânchez and Puigdefa Âbregas, 1994).…”

Section: Introductionmentioning

confidence: 99%

Measurement and modelling of rainfall interception by three semi-arid canopies

Domingo¹,

Sánchez²,

Moro³

et al. 1998

Agricultural and Forest Meteorology

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113

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The main aims of this study were, ®rstly, to adapt the rainfall interception model of Rutter et al. (Agric. Meterology, 1971, 9, 367±384) to individual plants of two semiarid shrubs (Anthyllis cytisoides L. and Retama sphaerocarpa (L.) Boiss.) and a tussock grass (Stipa tenacissima L.) and secondly, to understand how the different canopy structures in¯uence rainfall partitioning by individual plants. The selected species represent contrasting canopy types typical of vegetation of semiarid areas. Free throughfall coef®cients were estimated from ®eld measurements of low volume rainfall events and vertical photographs taken beneath the plant canopy. Canopy drainage curves were measured by continuous weighing of wetted plants. Canopy boundary layer conductances were calculated by measuring the evaporation of water from wet canopies. Field measurements of gross rainfall, throughfall and stem¯ow were taken for each rainfall event for A. cytisoides and R. sphaerocarpa. The Rutter type model of rainfall interception was adapted for individual shrubs and tested with measured rainfall events showing a good agreement between observed and predicted values for R. sphaerocarpa and for A. cytisoides.The interception model was then run to simulate interception loss during actual rainfall events, using atmospheric conditions measured every 5 s. The results from this simulation showed signi®cant differences in interception loss between species, which can be explained by differences in canopy drainage and boundary layer conductance, and are caused primarily by the structural differences in their canopies. R. sphaerocarpa gave lower interception than the other two species, S. tenacissima gave higher interception, while A. cytisoides had an intermediate value. The low interception loss by R. sphaerocarpa can be explained by its low total area index, thus, high free throughfall and high canopy drainage rate per unit projected canopy area. On the other hand, S. tenacissima and A. cytisoides, show a low free throughfall and drainage rate per unit projected canopy area because of their higher aerial biomass density. The ecological implications of these adaptations are discussed. #

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“…This discrepancy would be even larger if Fr is also small. Other similar studies also reported that the S-W model overestimated T under low LAI conditions [26,29,61].…”

Section: Evapotranspiration Components (E and T) And Its Vegetation Cmentioning

confidence: 54%

“…Use of either to estimate ET a over larger areas with different characteristics of vegetation distribution may result in considerable errors [25]. To obtain a more detailed representation of vegetation distribution in different ecosystems, efforts have been made to extend the dual-source model into multi-sources [8,[26][27][28]. However, these multi-source models usually have complicated model structures and require more parameters that are often difficult to determine.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Dual-Source Model of Estimating Evapotranspiration over Different Ecosystems and Implications for Satellite-Based Approaches

Liu

Yao

2014

Remote Sensing

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Accurate estimation of evapotranspiration (ET) and its components is critical to developing a better understanding of climate, hydrology, and vegetation coverage conditions for areas of interest. A hybrid dual-source (H-D) model incorporating the strengths of the two-layer and two-patch schemes was proposed to estimate actual ET processes by considering varying vegetation coverage patterns and soil moisture conditions. The proposed model was tested in four different ecosystems, including deciduous broadleaf forest, woody savannas, grassland, and cropland. Performance of the H-D model was compared with that of the Penman-Monteith (P-M) model, the Shuttleworth-Wallace (S-W) model, as well as the Two-Patch (T-P) model, with ET and/or its components (i.e., transpiration and evaporation) being evaluated against eddy covariance measurements. Overall, ET estimates from the developed H-D model agreed reasonably well with the ground-based measurements at all sites, with mean absolute errors ranging from 16.

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The effect of clumping and stomatal response on evaporation from sparsely vegetated shrublands

Cited by 97 publications

References 32 publications

Evapotranspiration model for semi-arid shrub-lands tested against data from SE Spain

Evapotranspiration model for semi-arid shrub-lands tested against data from SE Spain

Measurement and modelling of rainfall interception by three semi-arid canopies

A Hybrid Dual-Source Model of Estimating Evapotranspiration over Different Ecosystems and Implications for Satellite-Based Approaches

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