Evapotranspiration and estimation of aerodynamic and stomatal conductance in a fragment of Atlantic Forest in mantiqueira range region, MG

Pereira, Donizete dos Reis; Mello, Carlos Rogério de; Silva, Antônio Marciano da; Yanagi, Sílvia de Nazaré Monteiro

doi:10.1590/s0104-77602010000100004

Cited by 20 publications

(7 citation statements)

References 9 publications

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“…The increase in evapotranspiration in the scenarios with the highest percentage of native forest is mainly due to the higher leaf area index (LAI) of this type of vegetation, increasing the tree canopy -environment gas exchange (Pereira et al, 2010 volume explored by the forest roots increases water availability, resulting in higher consumption by forest vegetation. Water availability in the soil also increased with the introduction of conservation areas, as shown by the increased mean annual variation in soil water storage (∆θ), which was 8.5 mm for scenario C1 and 6.2 mm for C0 (Figure 4), contributing to an increase in evapotranspiration and reduction in annual runoff.…”

Section: Discussionmentioning

confidence: 99%

Impacts of deforestation on water balance components of a watershed on the Brazilian East Coast

Pereira

Almeida

Martinez

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYThe Brazilian East coast was intensely affected by deforestation, which drastically cut back the original biome. The possible impacts of this process on water resources are still unknown. The purpose of this study was an evaluation of the impacts of deforestation on the main water balance components of the Galo creek watershed, in the State of Espírito Santo, on the East coast of Brazil. Considering the real conditions of the watershed, the SWAT model was calibrated with data from 1997 to 2000 and validated for the period between 2001 and 2003. The calibration and validation processes were evaluated by the Nash-Sutcliffe efficiency coefficient and by the statistical parameters (determination coefficient, slope coefficient and F test) of the regression model adjusted for estimated and measured flow data. After calibration and validation of the model, new simulations were carried out for three different land use scenarios: a scenario in compliance with the law (C1), assuming the preservation of PPAs (permanent preservation areas); an optimistic scenario (C2), which considers the watershed to be almost entirely covered by native vegetation; and a pessimistic scenario (C3), in which the watershed would be almost entirely covered by pasture. The scenarios C1, C2 and C3 represent a soil cover of native forest of 76, 97 and 0 %, respectively. The results were compared with the simulation, considering the real scenario (C0) with 54 % forest cover. The NashSutcliffe coefficients were 0.65 and 0.70 for calibration and validation, respectively, indicating satisfactory results in the flow simulation. A mean reduction of 10 % of the native forest cover would cause a mean annual increase A costa leste brasileira passou por vasto processo de desmatamento, reduzindo drasticamente seu bioma original. Os possíveis impactos desse processo sobre os recursos hídricos ainda são desconhecidos. Objetivou-se com este trabalho avaliar os impactos do desmatamento sobre os principais componentes do balanço hídrico da bacia hidrográfica do córrego do Galo, ES, localizada na costa leste do Brasil. Para as condições atuais da bacia, o modelo SWAT foi calibrado, no período entre 1997 e 2000, e validado, entre 2001 e 2003. Os processos de calibração e validação foram avaliados pelo coeficiente de Nash-Sutcliffe e pelos parâmetros estatísticos (coeficiente de determinação, coeficiente angular e teste F) da regressão ajustada entre a vazão medida e estimada. Depois do modelo calibrado e validado, novas simulações foram realizadas, considerando três cenários distintos de uso do solo: o legalmente ideal (C1), que leva em consideração a preservação em áreas de APPs; o otimista (C2), que considera a bacia em quase sua totalidade preservada por vegetação nativa; e o pessimista (C3), que considera a bacia coberta em quase sua totalidade por pastagem; o que corresponde a 76, 97 e 0 % de cobertura florestal nativa. Os resultados foram comparados com a simulação realizada com o cenário atual (C0), com 54 % da área coberta com floresta. Os valores d...

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Section: Discussionmentioning

confidence: 99%

Impacts of deforestation on water balance components of a watershed on the Brazilian East Coast

Pereira

Almeida

Martinez

et al. 2014

Rev. Bras. Ciênc. Solo

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“…Regarding the water storage in the soil, annual average variations of 17.03 and 9.83 mm were simulated, equivalent to 1.3 and 0.7% of the total water balance, for the calibration and validation periods, respectively. Pereira et al (2010) performed the water balance in an Atlantic Forest area of a basin located in the region of the Mantiqueira Range, Brazil, on the basis of measurements made in the field. The authors found that evapotranspiration corresponded to 89%, percolation to 12.1% and storage to −1.1% of the water balance.…”

Section: Tablementioning

confidence: 99%

Hydrological simulation in a basin of typical tropical climate and soil using the SWAT model part I: Calibration and validation tests

Pereira¹,

Martinez²,

Pruski³

et al. 2016

Journal of Hydrology: Regional Studies

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Pomba river basin Maximum annual daily streamflows Minimum annual daily streamflow Split sample test Proxy basin test a b s t r a c t Study region: The study was developed for fhe Pomba River Basin, which is located in southeast region of Brazil in the continent of South America. Study focus: This study aimed to (a) calibrate and validate the SWAT model for a sub-basin of Pomba River Basin, (b) validate it for use with upstream and downstream control sections and (c) validate it for sub-basins other than the one where calibration was performed. This was done with the goal of having a model that can be used for the estimation of water availability and the planning of soil use and occupation. The model was calibrated by trial and error during the period from the maximum, average and minimum annual daily streamflows were evaluated based on the paired t-test and linear regression analysis. New hydrological insights: The SWAT model was qualified for simulating the Pomba River sub-basin in the sites where rainfall representation was reasonable to good. The model can be used in the simulation of maximum, average and minimum annual daily streamflow based on the paired t-test, contributing with the water resources management of region, although the model still needs to be improved, mainly in the representativeness of rainfall, to give better estimates of extreme values.

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“…In the Atlantic Forest, a fragment of forest had average g a of 0.099 m s -1 (Pereira et al, 2010), higher than other tropical forests.…”

Section: Conductance Aerodynamicsmentioning

confidence: 89%

Evapotranspiration and control mechanisms in managed Amazonian forest in, Par, Brazil

Aguiar¹,

Oliveira²,

Beldini³

et al. 2017

Afr. J. Agric. Res.

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This work examines whether management causes changes in evapotranspiration (ET) surface conductance (g s ), aerodynamic conductance (g a ) and the decoupling factor (Ω) in managed and natural forest sites in a tropical rain forest in the Amazon. The study was conducted in the Tapajós National Forest (FNT) in managed (logged) and natural (unlogged) forests, which have micrometeorological towers for data capture. For ET estimation, the Penman-Monteith (PM) and Eddy Covariance (EC) equations were used. The models were significantly different only for unlogged ( . Each area has different characteristics for the surface variables, g a , g s and Ω, and therefore the sites were different from each other for the study variables. However, logged ET did not differ for the PM, while EC decreased in the year after the management intervention, and was then followed by an increase.

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Evapotranspiration and estimation of aerodynamic and stomatal conductance in a fragment of Atlantic Forest in mantiqueira range region, MG

Cited by 20 publications

References 9 publications

Impacts of deforestation on water balance components of a watershed on the Brazilian East Coast

Impacts of deforestation on water balance components of a watershed on the Brazilian East Coast

Hydrological simulation in a basin of typical tropical climate and soil using the SWAT model part I: Calibration and validation tests

Evapotranspiration and control mechanisms in managed Amazonian forest in, Par, Brazil

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