Modelling and measurement of radiation interception by olive canopies

Modelling and measurement of radiation interception by olive canopies We present the formulation, calibration and validation of a model to estimate photosynthetically active radiation (PAR) intercepted by olive ( Olea europaea L.) canopies. The model calculates the PAR transmittance at any point located within the four central trees of the orchard. The spatial and time integration of this process allows calculation of PAR transmitted to the ground and, thus, the PAR intercepted at any given time. Direct-beam radiation, diffuse radiation and scattering are separately taken into account. Model parameters are the G -function, leaf reflectance and transmittance. Leaf inclination distributions, measured in the field, were used to derive the G -function. A planophile distribution was found. Leaf reflectances measured in three olive cultivars were, on average, 0.06 for adaxial and 0.12 for abaxial surfaces, while leaf transmittance was below 0.01. The model was barely sensitive to the parameters. Predictions of diffuse and total transmittance were tested on clear and overcast days in winter, fall and summer at Córdoba, Spain, in seven olive orchards of quite different characteristics. The validation showed that when estimating average canopy values, local errors compensate and the predictions of intercepted PAR seem correct for all canopy types, sun position and heights within the stand. The procedure seems applicable to any olive tree variety and does not present important systematic errors. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Agricultural and Forest Meteorology Elsevier

Modelling and measurement of radiation interception by olive canopies

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Publisher
Elsevier
Copyright
Copyright © 2000 Elsevier Science B.V.
ISSN
0168-1923
DOI
10.1016/S0168-1923(99)00137-9
Publisher site
See Article on Publisher Site

Abstract

We present the formulation, calibration and validation of a model to estimate photosynthetically active radiation (PAR) intercepted by olive ( Olea europaea L.) canopies. The model calculates the PAR transmittance at any point located within the four central trees of the orchard. The spatial and time integration of this process allows calculation of PAR transmitted to the ground and, thus, the PAR intercepted at any given time. Direct-beam radiation, diffuse radiation and scattering are separately taken into account. Model parameters are the G -function, leaf reflectance and transmittance. Leaf inclination distributions, measured in the field, were used to derive the G -function. A planophile distribution was found. Leaf reflectances measured in three olive cultivars were, on average, 0.06 for adaxial and 0.12 for abaxial surfaces, while leaf transmittance was below 0.01. The model was barely sensitive to the parameters. Predictions of diffuse and total transmittance were tested on clear and overcast days in winter, fall and summer at Córdoba, Spain, in seven olive orchards of quite different characteristics. The validation showed that when estimating average canopy values, local errors compensate and the predictions of intercepted PAR seem correct for all canopy types, sun position and heights within the stand. The procedure seems applicable to any olive tree variety and does not present important systematic errors.

Journal

Agricultural and Forest MeteorologyElsevier

Published: Feb 5, 2000

References

  • Radiation regime and canopy architecture in a boreal aspen forest
    Chen, J.M.; Blanken, P.D.; Black, T.A.; Guilbeault, M.; Chen, S.
  • Radiation transfer estimate in a row canopy: a simple procedure
    Ganis, A.
  • Simulation of oil palm growth and yield
    Van Kraalingen, D.W.G.; Breure, C.J.; Spitters, C.J.T.
  • Non-destructive measurement of leaf area in olive ( Olea europaea L.) trees using a gap inversion method
    Villalobos, F.J.; Orgaz, F.; Mateos, L.

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