Utility of Penman–Monteith, Priestley–Taylor, reference evapotranspiration, and pan evaporation methods to estimate pasture evapotranspiration

Sumner, David M.; Jacobs, Jennifer M.

doi:10.1016/j.jhydrol.2004.10.023

Cited by 288 publications

(190 citation statements)

References 38 publications

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“…A large body of literature already exists that can be used to predict stomatal conductance and evaporation from weather data such as net radiation, air temperature, vapour pressure deficit, and wind speed on a field level (e.g. de Bruin and Holtslag 1982;Sumner and Jacobs 2005) or subdivided into capitula and vegetative structures (Guilioni and Lhomme 2006). The final step in this process would be to verify the assumption that water supply to capitula is greatly reduced during the seed maturation and natural capitulum drying process (Smith and Kok 1984;Fahn 1990).…”

Section: Discussionmentioning

confidence: 99%

“…First, we must predict water loss from inflorescences using weather data. A number of models already exist that use weather data to predict water loss from entire plants (de Bruin and Holtslag 1982;Sumner and Jacobs 2005), and even from capitula separately from vegetative structures (Guilioni and Lhomme 2006). The second necessary piece of information, the relationship between water loss and seed release, must still be documented and is the focus of this paper.…”

Section: Introductionmentioning

confidence: 99%

“…Regression models have also been created to relate weather variables to seed release that include temperature (Wright et al 2008) or relative humidity (Greene et al 2008). However, temperature or relative humidity alone is a poor indicator of water loss by plants or of evaporation in general (Anderson 1936;de Bruin and Holtslag 1982;Sumner and Jacobs 2005). Therefore, empirical relationships between water loss and seed release are needed to improve mechanistic models of seed release.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Water loss from flower heads predicts seed release in two invasive thistles

Marchetto

Jongejans

Shea

et al. 2012

Plant Ecology & Diversity

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Background: Non-random seed release caused by plant responses to weather conditions is important for seed dispersal. Much is known about the effects of wind speed and turbulence, but our understanding of the effects of water loss on seed release is either qualitative, or indirect and phenomenological. Aims: To quantify the empirical relationship between water loss and seed release. Methods: Capitula of the invasive thistles Carduus acanthoides and C. nutans were collected from the field and treated for either 0, 1, or 2 days in the laboratory at three different vapour pressure deficit levels (3.4, 9.5, and 17.0 hPa) to cause a range of water loss values. Total seed release was quantified before and during wind tunnel trials. Results: Water loss was the only significant predictor of whether or not capitula released any seeds. The number of seeds released was predicted by water loss, capitulum diameter, and herbivore damage, with the same amount of water loss having less effect on larger capitula. Conclusions: These results represent an important step towards using weather data to predict seed release for many xerochastic species. Incorporating the effects of water loss on seed release into mechanistic seed dispersal models will greatly improve predictions of when and how far seeds disperse. While initiation of dispersal in some species is more likely during precipitation events (Pufal and Garnock-Jones 2010), a majority of wind dispersed angiosperms and gymnosperms are xerochastic, meaning that drying enhances seed abscission and release (Greene et al. 2008). For many Asteraceae species, including the invasive thistles Carduus nutans L. and Carduus acanthoides L. (Figure 1), drying causes cohesion tissues located on the outer side of the involucral bracts to lose turgidity and buckle, causing the bracts to be lowered away from the seeds and thus exposing seeds to the wind (Fahn 1990). Drying may also cause contraction of the receptacle away from seeds (Smith and Kok 1984).The ubiquity of xerochastic plant species suggests that seed dispersal models could be made more realistic and accurate for a wide range of species if weather data describing potential evaporation could be used to mechanistically predict seed release. Two important pieces of information need to be re-examined to accomplish this goal. First, we must predict water loss from inflorescences using weather data. A number of models already exist that use weather data to predict water loss from entire plants (de Bruin and Holtslag 1982;Sumner and Jacobs 2005), and even from capitula separately from vegetative structures (Guilioni and Lhomme 2006). The second necessary piece of information, the relationship between water loss and seed release, must still be documented and is the focus of this paper.Currently, our understanding of the effects of water loss and weather on seed release is either qualitative or phenomenological. Physiologically, we understand what effects dry conditions have on capitula (Smith and Kok 1984;Fahn 1990) and seed attachm...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Water loss from flower heads predicts seed release in two invasive thistles

Marchetto

Jongejans

Shea

et al. 2012

Plant Ecology & Diversity

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“…For pasture areas, evapotranspiration is between 182 and 437 mm year -1 (Sumner & Jacobs, 2005;Santana et al, 2010;Brauman et al, 2012;Du et al, 2013). According to Best et al (2003), evapotranspiration is the most important component of the hydrological cycle, because its magnitude usually exceeds that of other components, such as recharge, runoff and soil moisture variation.…”

Section: Resultsmentioning

confidence: 99%

Impact of changes in land use in the flow of the Pará River Basin, MG

Rodrigues

Elmiro

Braga³

et al. 2015

Rev. bras. eng. agríc. ambient.

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A B S T R A C TPlant cover plays an essential role in the maintenance and balance of the hydrological cycle, performing functions in the control of water availability, which guarantee flow permanence. The use of mathematical models is an alternative to represent the hydrological system and help in the understanding of phenomena involving the variables of the water cycle, in order to anticipate and predict impacts from potential changes in land use. In the present study, the hydrological model SWAT (Soil and Water Assessment Tool) was used to analyse the dynamics of flow and water flow in the Pará River Basin, Minas Gerais, Brazil, aiming to evaluate the impact caused by changes in land use in water availability. The adjusted model was assessed by the coefficient of efficiency of Nash-Sutcliffe (between -0.057 to -0.059), indicating high correlation and coefficient of residual mass (0.757 to 0.793) and therefore a satisfactory fit. An increase of about 10% in the basin flow was estimated, as a function of changes in land use, when simulating the removal of the original 'Cerrado' vegetation and of the seasonal semideciduous forest for pasture implementation in 38% of the basin.Impacto de alterações no uso do solo na vazão da Bacia do Rio Pará, MG R E S U M OA cobertura vegetal exerce papel fundamental na manutenção e no equilíbrio do ciclo hidrológico, desempenhando funções no controle da produção de água que garantem a permanência de vazões. O uso de modelos matemáticos é uma alternativa para representar o sistema hidrológico e auxiliar na compreensão dos fenômenos que envolvem as variáveis do ciclo da água para antecipar impactos decorrentes de eventuais mudanças no uso da terra. Neste trabalho é utilizado o modelo hidrológico SWAT (Soil and Water Assessment Tool) para analisar a dinâmica da vazão na bacia do Rio Pará, em Minas Gerais, Brasil, com o objetivo de avaliar o impacto provocado pelas alterações de uso do solo na disponibilidade de água da bacia do Rio Pará. O ajuste do modelo foi avaliado pelo coeficiente de eficiência de Nash-Sutcliffe (entre -0,057 a -0,059) indicando alta correlação e coeficiente de massa residual (0,757 a 0,793) e, portanto, um ajuste satisfatório. Estima-se que houve incremento de cerca de 10% na vazão da bacia em função das alterações no uso do solo, contemplando basicamente a supressão da vegetação original de Cerrado e de Floresta Estacional Semidecidual para implantação de pastagem em 38% do território da bacia.

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“…Due to the lack of a specific estimate of extinction coefficient γ, this parameter is assumed to be 0.53, which is the value determined by Angelocci et al (2008) for a similar coffee crop. On the other hand, and since only few values of LAI are available, the following expression is used to estimate daily values of LAI through the year (Sumner and Jacobs, 2005):…”

Section: Methodsmentioning

confidence: 99%

Numerical modeling of actual evapotranspiration of a coffee crop

Cesanelli

Guarracino

2011

Sci. agric. (Piracicaba, Braz.)

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The evapotranspiration estimation has great importance to crop productivity and agricultural water management. In this study, evapotranspiration is analyzed in a coffee (Coffea arabica L.) crop located in Piracicaba, state of São Paulo (Brazil) using a numerical method based on the simulation of both water flow and crop activity in the unsaturated zone of the soil. Actual evapotranspiration is estimated from potential evapotranspiration using water stress functions, meteorological data, soil hydraulic parameters, crop coefficients and leaf area index values. Crop transpiration and soil evaporation are individually quantified improving the analysis of the evapotranspiration process. The numerical procedure can predict periods of crop water stress and becomes an attractive tool to analyze the effect of non-standard conditions on coffee crops and to design efficient irrigation schedules. Simulated evapotranspiration values are in good agreement with experimental values determined in the study site.

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Utility of Penman–Monteith, Priestley–Taylor, reference evapotranspiration, and pan evaporation methods to estimate pasture evapotranspiration

Cited by 288 publications

References 38 publications

Water loss from flower heads predicts seed release in two invasive thistles

Water loss from flower heads predicts seed release in two invasive thistles

Impact of changes in land use in the flow of the Pará River Basin, MG

Numerical modeling of actual evapotranspiration of a coffee crop

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