Abstract: Based on radiation simulation model and crop growth model,the author analyzed effects of leaf area index dynamics on ground radiation of typical solar greenhouses in Beijing area.And the simulated radiation and the actual radiation were analyzed and compared,it showed that when leaf area index was more than 3.5,90 percent of radiation was absorbed and reflected.The mean absolute difference between the simulated radiation and the actual radiation was 22.17W·m-2,and the relative coefficient was 0.92.The crop growth model and radiation model had a good performance in inflecting radiation on ground in greenhouse.

Key words: Greenhouse model, Radiation distribution, Crop growth