Vapour flux density and transpiration rate comparisons in a stand of Maritime pine (Pinus pinaster Ait.) in Les Landes forest

Granier, André; Bobay, V.; Gash, J. H. C.; Gelpe, J.; Saugier, B.; Shuttleworth, W. James

doi:10.1016/0168-1923(90)90115-m

Cited by 134 publications

(70 citation statements)

References 12 publications

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“…The transpiration part (measured by the sapflow techniques) of the total evaporation, E tot measured by the eddy-correlation system, was 74% (ΣE comp / (ΣE tot ) and 61% (ΣE test / (ΣE tot ) for all days with transpiration above 1 mm day -1 . This is in the same range as reported for water balance studies in other coniferous forest [19,22,31] …”

Section: Comparison Of the Two Systemssupporting

confidence: 70%

“…The empirical calibration was re-evaluated and confirmed in stems of three tropical species, when the entire sensor was in contact with conducting xylem. Transpiration obtained from sapflow measurements agreed well with transpiration calculated from micrometeorological methods [19,41]. The Granier method and the Heat Pulse Velocity (HPV) method [40] were applied in the same stem of the tropical tree Gliricidia sepium and showed similar results [46].…”

Section: Introductionsupporting

confidence: 62%

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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: Comparison Of the Two Systemssupporting

confidence: 70%

Section: Introductionsupporting

confidence: 62%

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

2001

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“…When stand transpiration is measured (sap flow or eddy correlation), canopy conductance can be calculated by the reverse form of the Penman-Monteith equation (Stewart, 1988). Derivation of canopy conductance from sap flow measurements has been successfully compared to both eddy correlation measurements (Granier et al, 1990 and field measurements of stomatal conductance (Granier and Loustau, 1994;Lu et al, 1995 (Thom, 1972;Jarvis et al, 1976).…”

Section: Introductionmentioning

confidence: 99%

Modelling canopy conductance and stand transpiration of an oak forest from sap flow measurements

1996

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“…Studies in temperate and boreal forests have shown that understorey transpiration averages out at one-third of total stand ET (Diawara et al 1991;Granier et al 1990;Launiainen et al 2005;Ohta et al 2001), but can range from as little as 15 % (Constantin et al 1999;Lindroth 1985;Staudt et al 2011) to over 90 % (Simonin et al 2007). Loustau and Cochard (1991) explain that between-study differences in measured ET may be due to different climate demands, vegetation composition, and different development stages resulting in contrasting leaf area index (LAI).…”

Section: Introductionmentioning

confidence: 99%

Transpiration of four common understorey plant species according to drought intensity in temperate forests

Gobin¹,

Korboulewsky²,

Dumas³

et al. 2015

Annals of Forest Science

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Vapour flux density and transpiration rate comparisons in a stand of Maritime pine (Pinus pinaster Ait.) in Les Landes forest

Cited by 134 publications

References 12 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

Modelling canopy conductance and stand transpiration of an oak forest from sap flow measurements

Transpiration of four common understorey plant species according to drought intensity in temperate forests

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