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Estimating the interception of radiation is the first and crucial step for the prediction of production for intercropping systems. Determining the relative importance of radiation interception models to the specific outputs could assist in developing suitable model structures, which fit to the theory of light interception and promote model improvements. Assuming an intercropping system with a taller and a shorter crop, a variance-based global sensitivity analysis ( EFAST ) was applied to three radiation interception models ( M 1,  M 2 and  M 3). The sensitivity indices including main ( Si ) and total effects ( STi ) of the fraction of intercepted radiation by the taller ( ftaller ), the shorter ( fshorter ) and both intercrops together ( fall ) were quantified with different perturbations of the geometric arrangement of the crops (10-60 %). We found both  ftaller  and  fshorter  in  M 1 are most sensitive to the leaf area index of the taller crop ( LAItaller ). In  M 2, based on the main effects, the leaf area index of the shorter crop ( LAIshorter ) replaces  LAItaller  and becomes the most sensitive parameter for  fshorter  when the perturbations of widths of taller and shorter crops ( Wtaller  and  Wshorter ) become 40 % and larger. Furthermore, in  M 3,  ftaller  is most sensitive to  LAItaller  while  fshorter  is most sensitive to  LAIshorter  before the perturbations of geometry parameters becoming larger than 50 %. Meanwhile,  LAItaller ,  LAIshorter , and  Ktaller  are the three most sensitive parameters for  fall  in all three models. From the results we conclude that  M 3 is the most plausible radiation interception model among the three models.

Parameter Sensitivity and Uncertainty of Radiation Interception Models for Intercropping System