biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 49:527-532, 2005 | DOI: 10.1007/s10535-005-0046-1

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

J. J. Alarcon1,2, M. F. Ortuno1, E. Nicolas1, R. Torres3, A. Torrecillas1,2,*
1 Centro de Edafologia y Biologia Aplicada del Segura (CSIC), Espinardo (Murcia), Spain
2 Unidad Asociada al CSIC de Horticultura Sostenible en Zonas Aridas (UPCT-CEBAS), Cartagena (Murcia), Spain
3 Universidad Politecnica de Cartagena (UPCT), Cartagena (Murcia), Spain

Potted 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.

Keywords: Citrus aurantium rootstock; Citrus limon; water stress
Subjects: Citrus aurantium; Citrus limon; gas exchange, transpiration, sap flow; heat-pulse measurement, sap flow; lemon, sap flow; rootstock, Citrus; sap flow, transpiration, lemon; transpiration rate; water potential; water stress, transpiration, daily course

Received: March 16, 2004; Accepted: February 25, 2005; Published: December 1, 2005  Show citation

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Alarcon, J.J., Ortuno, M.F., Nicolas, E., Torres, R., & Torrecillas, A. (2005). Compensation heat-pulse measurements of sap flow for estimating transpiration in young lemon trees. Biologia plantarum, 49(4), 527-532. doi: 10.1007/s10535-005-0046-1
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