Energy balance measurements over a banana orchard in the Semiarid region in the Northeast of Brazil

Santos, Carlos Antônio Costa dos; Silva, Bernardo Barbosa da; Rão, Tantravahi Venkata Ramana; Neale, Christopher M. U.

doi:10.1590/s0100-204x2009001100001

Cited by 2 publications

(1 citation statement)

References 22 publications

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“…plantations. Several methods have been used to determine water consumption of banana, such as micrometeorological (Santos et al, 2009;Ding et al, 2013), lysimetric (Santana et al, 1993) and soil water balance. For both drainage lysimeters and soil water balance methods, ET is calculated by directly measuring the components of the soil water balance applied over a period of time (Δt) within the soil volume.…”

Section: Introductionmentioning

confidence: 99%

Water extraction variability in the banana root zone affects the reliability of water balance

Silva

Coelho

Filho

2015

Sci. agric. (Piracicaba, Braz.)

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Spatial and temporal variability of soil water extraction from the root zone affect soil water balance determination. The number of sensors installed in the root zone in studies addressing water balance is still set arbitrarily. This study provided an investigation of the water extraction process by banana (Musa spp.) roots by (i) determining the variability of water extraction from the banana tree root zone, (ii) detecting differences in the estimation of evapotranspiration (ET) by the soil water balance method when the number of soil profiles monitored in the roots zone varies, (iii) and; determining the minimum number of Time Domain Reflectometry (TDR) probes needed to obtain ET precision and accuracy similar to that determined by a drainage lysimeter. The field experiment was conducted in Cruz das Almas, in the state of Bahia, Brazil, where a drainage lysimeter was installed on a banana plantation. The water extraction in the banana root zone was quantified by the water content variations monitored in 72 points by TDRs, with measurements at 15-min intervals. The variability of water extraction in the banana root zone was medium to high. The range of variability affects the reliability of the crop evapotranspiration calculation by the soil water balance method. To prevent an overestimation of banana evapotranspiration, the water extraction in the soil profile must be monitored with at least 16 TDR probes installed at a minimum distance of 0.9 m and a minimum depth of 0.7 m.

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Section: Introductionmentioning

confidence: 99%

Water extraction variability in the banana root zone affects the reliability of water balance

Silva

Coelho

Filho

2015

Sci. agric. (Piracicaba, Braz.)

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Mudanças no uso da terra e o particionamento de energia no sudoeste da Amazônia

Webler

Gomes

Aguiar³

et al. 2013

Rev. bras. eng. agríc. ambient.

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RESUMOA expressiva taxa de desmatamento na região amazônica tem se tornado uma preocupação mundial. Este processo consiste, substancialmente, na conversão de sistemas florestais em sistemas agropecuários. Este novo ecossistema requer estudos que elucidem quanto ao seu funcionamento buscando o entendimento de como a referida região interage com a atmosfera. Com o intento de investigar o comportamento de componentes do balanço de energia em uma área de pastagem foi realizado um estudo na Fazenda Nossa Senhora, no município de Ouro Preto do Oeste, Rondônia, buscando-se analisar os padrões da radiação líquida e dos fluxos de calor latente, sensível e no solo, nos períodos: úmido, úmido-seco, seco e seco-úmido, nos anos de 2000 a 2005. As medidas dos fluxos de calor latente e sensível foram realizadas utilizando-se o método de covariância de vórtices turbulentos. Os resultados dessas análises evidenciaram que o particionamento de energia em uma área de pastagem nos períodos úmido, úmido-seco, seco e seco-úmido foram, respectivamente, de 77,8; 69,6; 50,6 e 75,2% para o fluxo de calor latente e 22,5; 31,2; 46,7 e 24,7% para o fluxo de calor sensível, indicando uma vulnerabilidade maior da pastagem às alterações sazonais. Palavras-chave: pastagem, fluxos de energia, correlação de vórtices turbulentosChanges in land use and energy partitioning in the southwest of the Amazon ABSTRACT The significant rate of deforestation in the Amazon region has become a global concern. This process consists substantially in the conversion from forest to agricultural systems, which is the activity that drives the local economy. This new ecosystem formed requires studies that elucidate its operation, seeking to understand how this region interacts with the atmosphere. To investigate the behavior of energy balance components in a grassland ecosystem, a study was conducted at Fazenda Nossa Senhora (FNS), in Ouro Preto do Oeste, Rondônia. This study examined net radiation and sensible, latent and soil heat fluxes patterns, in the periods: wet, wet-dry, dry and dry-wet from 2000 to 2005. Measurements of sensible and latent heat fluxes were performed using the eddy covariance method. The results of these analyses showed that the partitioning of energy in the grassland were 77.8, 69.6, 50.6 and 75.2%, respectively in the wet, wet-dry, dry and dry-wet periods, for the latent heat flux and 22.5, 31.2, 46.7 and 24.7% for the sensible heat flux, indicating a higher vulnerability of grassland to seasonal changes.

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Energy balance measurements over a banana orchard in the Semiarid region in the Northeast of Brazil

Cited by 2 publications

References 22 publications

Water extraction variability in the banana root zone affects the reliability of water balance

Water extraction variability in the banana root zone affects the reliability of water balance

Mudanças no uso da terra e o particionamento de energia no sudoeste da Amazônia

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