Partitioning of net radiation and evapotranspiration over a superintensive drip-irrigated olive orchard
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To evaluate the partitioning of net radiation (R n) and actual evapotranspiration (ET a), measurements of R n, sensible heat flux (H), soil heat flux (G), latent heat flux (LE), reference evapotranspiration (ET o), transpiration (T p) and soil evaporation (E s) were taken during the 2009/2010 and 2010/2011 growing seasons on a flat and uniform olive (cv. Arbequina) orchard, located in the Pencahue Valley, Región del Maule, Chile (35°23′ LS; 71°44′ LW; 96 m above sea level). Olive trees were trained on a triangular hedgerow system with a plant density of 1333 trees ha−1 (superintensive). An eddy covariance system, sapflow sensors and microlysimeter were used to measure ET a, T p and E s, respectively. Results indicated that the eddy covariance measurements showed a lack of the energy balance closure of 12.8 %. Values of LE, H and G were between 28–47, 34–68 and 2–6 % of R n, respectively, while ratios of T p and E s to ET a ranged between 0.64–0.74 and 0.26–0.36, respectively. During two growing seasons, the single crop coefficient (K c = ET a/ET o) was between 0.27 and 0.66, while the dual crop coefficient (T p/ET o + E s/ET o) ranged between 0.26 and 0.56. According to these results, H and T p were the main component of R n and ET a, respectively, for the particular conditions of the drip-irrigated olive orchard with a fractional cover of 30 % and wetted area of 4.5 %.
KeywordsLeaf Area Index Latent Heat Flux Heat Flux Olive Tree Eddy Covariance
This study was supported by the Chilean government through the projects FONDECYT (N°N°1100714 and 1130729), FONDEF (NºD10I1157) and by the Universidad de Talca through the research program “Adaptation of Agriculture to Climate Change (A2C2)”. Also, authors would like to thank Mr. Manuel Barrera and Mr. Alvaro Ried from the “Olivares de Quepu” Company for their technical support.
- Allen RG, Pereira LS, Raes D, Smith M (1998) Crop evapotranspiration: guidelines for computing crop water requirements, Irrigation and Drainage Paper 56. United Nations FAO, Rome, p 300. http://www.fao.org/docrep/X0490E/X0490E00.htm
- Berenguer MJ, Vossen PM, Grattan SR, Connell JH, Polito VS (2006) Tree irrigation levels for optimum chemical and sensory properties of olive oil. HortScience 41:427–432Google Scholar
- Fereres E, Castel JR (1981) Drip irrigation management. Division of Agricultural Sciences. University of California (Publication Leaflet 21259)Google Scholar
- Gómez del Campo M, Fernández JE (2007) Manejo del riego de olivares en seto a partir de medidas en suelo y planta. Editorial Agrícola Española, MadridGoogle Scholar
- Ortega-Farías S, López-Olivari R (2010) Evaluation of a two-layer Model to Estimate the Latent heat flux over a Drip-Irrigated Olive Orchard. In: 5th national decennial irrigation CD-ROM proceedings. Paper IRR 10-9981. ASABE Publication 711P0810cdGoogle Scholar
- Santos F, Valverde PC, Ramos AF, Reis JL, Castanheira NL (2006) Olive Tree’s transpiration rates in Southern Portugal. Paper number 067123, ASAE Annual Meeting. doi:10.13031/2013.21050@2006Google Scholar
- Villalobos FJ, Testi L, Orgaz F, García-Tejera O, Lopez-Bernal A, González-Dugo MV, Ballester-Lurbe C, Castel JR, Alarcón-Cabañero JJ, Nicolás-Nicolás E, Girona J, Marsal J, Fereres E (2013) Modelling canopy conductance and transpiration of fruit trees in Mediterranean areas: a simplified approach. Agric For Meteorol 171–172:93–103CrossRefGoogle Scholar
- Williams DG, Cable W, Hultine K, Hoedjes JCB, Yepez EA, Simonneaux V, Er-Raki S, Boulet G, de Bruin HAR, Chehbouni A, Hartogensis OK, Timouk F (2004) Evapotranspiration components determined by stable isotope, sap flow and eddy covariance techniques. Agric For Meteorol 125:241–258CrossRefGoogle Scholar
- Wilson K, Goldstein A, Falge E, Aubinet M, Baldocchi D, Berbigier P, Bernhofer C, Ceulemans R, Dolman H, Field C, Grelle A, Ibrom A, Law BE, Kowalski A, Meyers T, Moncrieff J, Monson R, Oechel W, Tenhunen J, Valentini R, Verma S (2002) Energy balance closure at FLUXNET sites. Agric For Meteorol 113:223–243CrossRefGoogle Scholar