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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/596

Title: Balanço energético e coeficientes culturais em Pyrus communis L. cv. 'Rocha'
Authors: Conceição, Nuno Miguel Santos da
Advisor: Ferreira, Maria Isabel
Paço, Maria Teresa Afonso Gomes do
Keywords: pera Rocha
pyrus communis
evapotranspiração
evapotranspiration
fluxo de seiva
sap flow
balanço energético
energy balance
coberto esparso
sparce vegetation
programação da rega
irrigation scheduling
Issue Date: 2007
Abstract: The experimental work, on the water use of a pear orchard (Pyrus communis cv. ‘Rocha’), took place in the region of Oeste, Portugal (lat. 39º 28’ N, long. 9º 7’ W), during the growth periods of 2004 and 2007. Measurements of sensible and latent heat (evapotranspiration - ETec), obtained with the eddy covariance technique, and other energy balance components, took place in 2004 (12 days in August) and in 2007 (43 days from June to September). In 2007, sap flux was also measured, using the Granier method (from May to September), as well as the radial profile of sap flux velocity, using a heat pulse method (compensation technique). The Granier sensors have been built with innovative technical improvements, aiming at the measurement of temperature natural gradients in real time, simultaneously with sap flow measurements. Using transpiration results (calculated as the difference between ETec and soil evaporation obtained with lysimeters) and sap flow measurements it was possible to calibrate the Granier method. The following function was obtained: 1.958 1 154 10 5 + − = × × i i u K , where ui is the sap flux density [m3.m-2.s-1] and Ki+1 is the flux index. As a result of the calibration performed, a seasonal variation of transpiration could be obtained, with a mean value of 1,1 mm.day-1 in 2007, corresponding to an average basal crop coefficient of 0.32, with a minimum in May (0.25) and a maximum in August (0.37). Considering the soil evaporation component and the understorey transpiration, a crop coefficient of 0.6 was obtained in 2004 and 0.7 in 2007, clearly below the tabled values. Key-words: evapotranspiration, irrigation scheduling, sap flow, Pyrus communis L. cv. ‘Rocha’, energy balance, sparse vegetation
Description: Mestrado em Agricultura e Horticultura Sustentáveis - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/596
Appears in Collections:BISA - Dissertações de Mestrado / Master Thesis

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0de7_NunoConceicaoBalancoEnergeticoCoeficientesCulturaisPyrusCommunis_2007.pdfCapa19.71 kBAdobe PDFView/Open
1de7_NunoConceicaoBalancoEnergeticoCoeficientesCulturaisPyrusCommunis_2007.pdfResumo/Abstract/indice1.45 MBAdobe PDFView/Open
2de7_NunoConceicaoBalancoEnergeticoCoeficientesCulturaisPyrusCommunis_2007.pdfRevisão Bibliográfica107.96 kBAdobe PDFView/Open
3de7_NunoConceicaoBalancoEnergeticoCoeficientesCulturaisPyrusCommunis_2007.pdfMateriais e Métodos1.79 MBAdobe PDFView/Open
4de7_NunoConceicaoBalancoEnergeticoCoeficientesCulturaisPyrusCommunis_2007.pdfMateriais e Métodos1.79 MBAdobe PDFView/Open
5de7_NunoConceicaoBalancoEnergeticoCoeficientesCulturaisPyrusCommunis_2007.pdfResultados e Discussão1.08 MBAdobe PDFView/Open
6de7_NunoConceicaoBalancoEnergeticoCoeficientesCulturaisPyrusCommunis_2007.pdfReferências Bibliográficas68.69 kBAdobe PDFView/Open
7de7_NunoConceicaoBalancoEnergeticoCoeficientesCulturaisPyrusCommunis_2007.pdfAnexos228.64 kBAdobe PDFView/Open
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