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Compensation heat-pulse measurements of sap flow for estimating transpiration in young lemon trees

AutorAlarcón Cabañero, Juan José ; Ortuño Gallud, Mª Fernanda ; Nicolás Nicolás, Emilio ; Torres, R. ; Torrecillas Melendreras, Arturo
Palabras claveCitrus aurantium rootstock
Citrus limon
Water stress
Fecha de publicacióndic-2005
CitaciónBiologia Plantarum 49(4): 527-532 (2005)
ResumenPotted two-year-old lemon trees [Citrus limon (L.) Burm. f.], cv. Verna grafted on sour orange (C. aurantium L.) rootstock, growing in greenhouse, were subjected to drought for 33 d. Control plants were daily irrigated at field capacity. Values of sap flow (SF) were compared with transpiration (E) rates measured gravimetrically. The results underlined the robustness and high sensitivity of the compensation heat-pulse technique for estimating transpiration on a wide range of SF. Good direct correlations between E and SF rates on an instantaneous and daily basis were obtained in both treatments. On a daily basis, a common calibration curve can be used for both irrigation treatments. On an instantaneous basis, changes in SF were matches by similar changes in E in both treatments, although the relationships between these parameters presented different intercepts in each treatment. Sap flow rates were influenced by weather conditions in trees growing in non-limiting soil water conditions. This makes it possible to evaluate the significance of any sap flow measurement in relation to the reference value calculated for the vapour pressure deficit at the time the measurement was taken.
Versión del editorhttp://dx.doi.org/10.1007/s10535-005-0046-1
ISSN0006-3134 (Print)
1573-8264 (Online)
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