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Study of the within-plant spatial variability of stomatal conductance on a young ‘Arbequina’ olive orchard under drip-irrigated and semi-arid conditions

Lookup NU author(s): Dr James Taylor


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For drip-irrigated olive orchards, plant water status monitoring is an important tool for irrigation management practices, as it determines final fruit and oil yield. However, plant water status monitoring using plant physiological measurements, such as plant water potential and stomatal conductance (gs) imposes a challenge because the selection of the measurement site inside the canopy must be representative of the whole plant trend. Therefore, the objective of the present work was to study the spatial variability of stomatal conductance at the within-plant scale on a young drip-irrigated olive orchard under semi-arid growing conditions. A field study was carried out on a commercial drip-irrigated olive orchard (Olea europea L. ‘Arbequina’) located in Pencahue valley, Maule Region, Chile (35º 23’ S; 71º 44’ W; WGS 84; 96 m.a.s.l.). Measurements of gs were done at four dates using an infrared gas analyzer (LI-COR, LI-6400, USA) during the 2011-2012 growing season. The results show that under mild to moderate water restriction (−1.5 to −2.2 MPa), intracanopy stomatal conductance variability was high and two sectors were identified, independent of the level of vegetative expression. In contrast, under moderate to strong water restriction (< −2.2 to −3.5 MPa), intra-canopy stomatal conductance variability was low for both high and low vegetative expression, with no sector detected. These considerations are relevant to select the more appropriate site within the canopy for plant water status and/or gas exchange measurements.

Publication metadata

Author(s): Valdés-Gómez H, Guajardo A, Jara-Rojas F, Acevedo-Opazo C, Taylor JA

Publication type: Article

Publication status: Published

Journal: Idesia

Year: 2015

Volume: 33

Issue: 3

Pages: 43-48

Print publication date: 15/07/2015

Online publication date: 10/06/2015

Acceptance date: 10/06/2015

ISSN (print): 0073-4675

ISSN (electronic): 0718-3429

Publisher: Universidad de Tarapaca


DOI: 10.4067/S0718-34292015000300007

Notes: Corresponding Author is Cesar Acevedo-Opazo


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