<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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 (<italic>EFAST</italic>) was applied to three radiation interception models (<italic>M</italic>1, <italic>M</italic>2 and <italic>M</italic>3). The sensitivity indices including main (<italic>Si</italic>) and total effects (<italic>STi</italic>) of the fraction of intercepted radiation by the taller (<italic>ftaller</italic>), the shorter (<italic>fshorter</italic>) and both intercrops together (<italic>fall</italic>) were quantified with different perturbations of the geometric arrangement of the crops (10-60 %). We found both <italic>ftaller</italic> and <italic>fshorter</italic> in <italic>M</italic>1 are most sensitive to the leaf area index of the taller crop (<italic>LAItaller</italic>). In <italic>M</italic>2, based on the main effects, the leaf area index of the shorter crop (<italic>LAIshorter</italic>) replaces <italic>LAItaller</italic> and becomes the most sensitive parameter for <italic>fshorter</italic> when the perturbations of widths of taller and shorter crops (<italic>Wtaller</italic> and <italic>Wshorter</italic>) become 40 % and larger. Furthermore, in <italic>M</italic>3, <italic>ftaller</italic> is most sensitive to <italic>LAItaller</italic> while <italic>fshorter</italic> is most sensitive to <italic>LAIshorter</italic> before the perturbations of geometry parameters becoming larger than 50 %. Meanwhile, <italic>LAItaller</italic>, <italic>LAIshorter</italic>, and <italic>Ktaller</italic> are the three most sensitive parameters for <italic>fall</italic> in all three models. From the results we conclude that <italic>M</italic>3 is the most plausible radiation interception model among the three models.</p></abstract>

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 (M1, M2 and M3). 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 M1 are most sensitive to the leaf area index of the taller crop (LAItaller). In M2, 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 M3, 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 M3 is the most plausible radiation interception model among the three models.

Parameter Sensitivity and Uncertainty of Radiation Interception Models for Intercropping System

State Key Laboratory of Water Resources and Hydropower Engineering Science

State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin

Ecological Chemistry and Engineering S

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Estimating the interception of radiation is the first and crucial step for the prediction of production for intercropping systems. Determining the relative...

Parameter Sensitivity and Uncertainty of Radiation Interception Models for Intercropping System

Published Online: Oct 14, 2020

Page range: 437 - 456

DOI: https://doi.org/10.2478/eces-2020-0028

Keywords
intercropping, global sensitivity analysis, Extended Fourier Amplitude Sensitivity Test, radiation interception, uncertainty analysis

© 2020 Wenzhi Zeng et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Parameter Sensitivity and Uncertainty of Radiation Interception Models for Intercropping System

Published Online: Oct 14, 2020

Page range: 437 - 456

DOI: https://doi.org/10.2478/eces-2020-0028

Keywordsintercropping, global sensitivity analysis, Extended Fourier Amplitude Sensitivity Test, radiation interception, uncertainty analysis

© 2020 Wenzhi Zeng et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
intercropping, global sensitivity analysis, Extended Fourier Amplitude Sensitivity Test, radiation interception, uncertainty analysis