A three-dimensional model of solar radiation transfer in a non-uniform plant canopy

3rd International Conference Environment and Sustainable Development of Territories: Ecological Challenges of the 21st Century

生态环境科学;地球科学;经济学

Levashova, N.T.^1 ; Mukhartova, Yu V.^1

Faculty of Physics, M.V. Lomonosov Moscow State University, 1-2, Leninskiye Gory, Moscow

119991, Russia^1

关键词: Horizontal homogeneity;    Leaf area distribution;    Photosynthetically active radiation;    Radiation transfer;    Radiation transmission;    Radiative transfer equations;    Three dimensional (3-D) modeling;    Three-dimensional model;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/107/1/012101/pdf
DOI  :  10.1088/1755-1315/107/1/012101

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

A three-dimensional (3D) model of solar radiation transfer in a non-uniform plant canopy was developed. It is based on radiative transfer equations and a so-called turbid medium assumption. The model takes into account the multiple scattering contributions of plant elements in radiation fluxes. These enable more accurate descriptions of plant canopy reflectance and transmission in different spectral bands. The model was applied to assess the effects of plant canopy heterogeneity on solar radiation transmission and to quantify the difference in a radiation transfer between photosynthetically active radiation PAR (=0.39-0.72 μm) and near infrared solar radiation NIR (Δλ = 0.72-3.00 μm). Comparisons of the radiative transfer fluxes simulated by the 3D model within a plant canopy consisted of sparsely planted fruit trees (plant area index, PAI - 0.96 m2m-2) with radiation fluxes simulated by a one-dimensional (1D) approach, assumed horizontal homogeneity of plant and leaf area distributions, showed that, for sunny weather conditions with a high solar elevation angle, an application of a simplified 1D approach can result in an underestimation of transmitted solar radiation by about 22% for PAR, and by about 26% for NIR.