A model for canopy light distribution in rice was developed by integrating certain advantages in existing models, and then a processbased photosynthetic production model was furtherly developed by integrating the canopy light distribution model with the rice photosynthesis. The rice canopy was divided into five layers according to leaf area index. Solar radiant intensity on horizontal plane at each layer was calculated by MonsiSaeki exponential model. The direct and diffuse radiations were calculated from the local meteorological data of sunshine duration, while the diurnal variation of photosynthetically active rediation and the influence of direct radiation extinction coefficient on both canopy structure and solar position were also considered. Preliminary validation of canopy light distribution model with independent field experiment datasets showed that the model could accurately predict canopy light distribution under different growing environments. The RMSE(root mean square error) of predicting in rice dry weight for canopylightdistributionbased model and an existing model were 0.74 t/hm2 and 1.26 t/hm2, respectively, indicating that the canopylightdistributionbased model had a better performance. This study would further play an important role in improvement of rice growth model, rice production management and regulation and variety digital design.
TANG Liang1, LI Yan-Da1, 2 , ZHANG Yu-Ping1, 3 , ZHU Xiang-Cheng1, LIU Xiao-Jun1, CAO Wei-Xing1, ZHU Yan1, *
. Simulation of Canopy Light Distribution and Application in Rice[J]. Chinese Journal OF Rice Science, 2011
, 25(4)
: 427
-434
.
DOI: 10.3969/j.issn.1001-7216.2011.04.013
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