Evaluation of Granier's sap flux sensor in young mango trees

Lü, Ping; Chacko, E. K.

doi:10.1051/agro:19980703

Cited by 41 publications

(22 citation statements)

References 13 publications

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“…Few laboratory tests have been performed between measured sapflow and gravimetric measurements of water loss. A cut-tree comparison on grapevine (Vitis vinifera L.) [2] and a lysimeter study on mango (Mangifera indica L.) [29] showed good agreement with the original calibration at flow rates up to 225 g m -2 s -1 . Clearwater et al [13] found that heat dissipation probes used with the original Granier calibration underestimated water flow through excised stems from several species if the probe was in partial contact with non-active xylem.…”

Section: Introductionmentioning

confidence: 92%

“…Our studies, as well as others, suggest that the Granier system loses sensitivity at higher flow rates. However, it has been shown that the original calibration is valid even for high flow densities in grape vines (225 g m -2 s -1 ) [2] and in mango (120 g m -2 s -1 ) [29]. The original calibration does not show any large errors up to 150 g m -2 s -1 [17,18].…”

Section: Comparison Of the Two Systemsmentioning

confidence: 99%

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Evaluation of heat balance and heat dissipation methods for sapflow measurements in pine and spruce

2001

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-The tissue heat-balance method (Cÿ ermák) and the heat-dissipation method (Granier) were compared in three Scots pines and two Norway spruces in a forest in central Sweden. The Granier system measured up to 50% lower sapflow than the Cÿ ermák system at high flow rates. New coefficients for the Granier system were estimated, based on sapflow density from the Cÿ ermák measurements. Without compensation, natural temperature gradients may cause large errors in measurements made by the Granier system. By using a horizontal reference sensor, no compensation was necessary. It was also shown that radial flow patterns must be considered when calculating total tree sapflow. Transpiration of two adjacent stands, one measured by the Granier method and the other by the Cÿ ermák method, showed good agreement internally and with total evaporation measured by the eddy-correlation method. THB / HD / sap-flow / transpiration / Picea abies / Pinus sylvestrisRésumé -Évaluation des méthodes des équilibres thermiques et de dissipation thermique concernant la mesure de flux de sève pour le pin et l'épicéa. La méthode des équilibres thermiques (Cÿ ermák), et la méthode de dissipation thermique (Granier) ont été comparées pour trois Pins sylvestres et deux épicéas dans une forêt du centre de la Suède. Le système Granier a donné des valeurs de flux de sève jusqu'à 50 % plus faible que le système Cÿ ermák pour les flux élevés. De nouveaux coefficients basés sur les mesures de densité de flux obtenues avec le système Cÿ ermák ont été estimés pour le système Granier. Le système Granier sans compensation pour les gradients naturels de température dans le tronc peut présenter de larges erreurs, mais si un capteur de référence horizontal est utilisé, les compensations ne sont pas nécessaires. Il a aussi été démontré que les variations radiales de flux doivent être prises en compte lors des calculs de flux de sève pour l'arbre entier. Les transpirations de deux couverts adjacents, l'un mesuré avec la méthode Granier, et l'autre avec la méthode Cÿ ermák, sont en accord entre elles et avec l'évaporation totale mesurée par la méthode des corrélations turbulentes. THB / HD / flux de sève / transpiration / Picea abies / Pinus sylvestris

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Section: Introductionmentioning

confidence: 92%

Section: Comparison Of the Two Systemsmentioning

confidence: 99%

Evaluation of heat balance and heat dissipation methods for sapflow measurements in pine and spruce

2001

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“…This resulted in an overall 54% error in SFD (i.e., approximately 1.5 times the sap flux density calculated from Equation (1)). Using the same method, Lu and Chacko [38] found that the TDP method underestimated cumulative daily SFD by 6-10% in two Mangifera indica trees. Steppe et al [33] found an underestimate of SFD by 60% in Fagus grandifolia trees.…”

Section: Calibration Of Parameters For the Original Granier Equationmentioning

confidence: 98%

Stand Transpiration Estimates from Recalibrated Parameters for the Granier Equation in a Chinese Fir (Cunninghamia lanceolata) Plantation in Southern China

Ouyang

Xiao

Zhao

et al. 2018

Forests

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Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) is an important native tree species that is widely distributed in subtropical areas of southern China and cultivated for wood extraction. However, information on water use by Chinese fir plantations is still scarce. In this study, we performed species-specific parameter calibrations for the original Granier equation for sap flow density (SFD) estimates. Stand transpiration (E s ) was related to environmental inputs, such as rainfall, air temperature (T a ), vapor pressure deficit (VPD), photosynthetically-active radiation (PAR), air relative humidity (RH), and potential evapotranspiration (PET) in order to examine how environmental factors affect the E s of Chinese fir plantations. According to our results, Granier's original parameters set underestimated C. lanceolata SFD by up to 54% compared to our species-specific calibrated parameters set. A strong positive correlation was found between SFD, diameter at breast height (DBH), and tree height among trees populations. The total E s in 2015 was 522.1 mm, with obvious seasonal dynamics and an average of 1.4 mm·day −1 . Daily and monthly E s were positively correlated with VPD, PAR, T a , and PET. A negative relationship between E s and RH was detected only at a daily timescale. Our findings indicate that the original Granier equation requires a parameter calibration when it is applied to species-specific thermal dissipation probe (TDP) estimates, and our findings can also provide novel insights on the water use of Chinese fir in major wood production areas in Southern China.

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“…No caso da cultura da manga, alguns estudos envolvendo os métodos térmicos para a quantificação do fluxo de seiva foram realizados (Lu & Chacko, 1998;Coelho Filho et al, 2006) e evidenciaram bons resultados de estimativas do fluxo de seiva comparadas a transpiração medidas em lisímetros. Coelho Filho et al (2006), trabalhando com lisímetros de pesagem, encontraram boa resposta dinâmica do MDT e subestimativas que devem ser corrigidas a fim de se quantificar a transpiração.…”

Section: Introductionunclassified

Relações entre transpiração máxima, evapotranspiração de referência e área foliar em quatro variedades de mangueira

Oliveira¹,

Filho

Pereira³

et al. 2009

Rev. Bras. Frutic.

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Nas condições edafoclimáticas de Cruz da Almas - BA, na Embrapa Mandioca e Fruticultura Tropical, foi realizado um estudo no qual se relacionou a transpiração máxima (Litros m-2 folha/dia -1) de quatro variedades de mangueira (Tommy Atkins, Palmer, Haden e Van Dyke, com áreas foliares totais de 14; 8; 33 e 12 m², respectivamente) com a evapotranspiração de referência (ETo). A transpiração das plantas (L dia-1) foi estimada por meio de sensores que realizam o balanço de calor no caule (modelos SAG13; SGB9; SGB16; SGB19 e SGB25, Dynamax Inc.) dispostos nos sentidos norte (N), sul (S), leste (E), oeste (W) e centro (C) de cada planta. A transpiração por unidade de área foliar (Lm-2 folha dia-1) variou em média de 1,58 ao longo do período estudado, e linearmente com o aumento da área foliar total da planta, independentemente da variedade estudada. A transpiração (Litros m-2 folha/dia -1) variou de 0,36 a 3,00, dependendo da demanda atmosférica. A transpiração máxima (T) das quatro variedades de mangueira (Litros m-2 folha/dia -1) relacionouse linearmente com a ETo (T = 0,44. ETo; r² = 0,78), sendo um excelente subsídio para o manejo de irrigação por gotejamento nesta cultura.

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Evaluation of Granier's sap flux sensor in young mango trees

Cited by 41 publications

References 13 publications

Evaluation of heat balance and heat dissipation methods for sapflow measurements in pine and spruce

Evaluation of heat balance and heat dissipation methods for sapflow measurements in pine and spruce

Stand Transpiration Estimates from Recalibrated Parameters for the Granier Equation in a Chinese Fir (Cunninghamia lanceolata) Plantation in Southern China

Relações entre transpiração máxima, evapotranspiração de referência e área foliar em quatro variedades de mangueira

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