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《Journal of Beijing Forestry University》 1985-01
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Yuan Jiazhu He Qingtang  
Based on the geometric structures of seedling crown, the authors the oritically calculated durations of sunshine, transmittivity and light distribution, for crops with different directions and different leaf area indexes, during the summer half year (from the Spring Equinox to the Autumnal Equinox) in Beijing area. The results show that 1) light distribution is obviously affected by the row direction,The seedlings in east-west rows have 7 hours more in daily sunshine and 7.8 percent larger in average transmivity than those in south-north rows; and 2 ) the effect of the density of seedlings on the transmission condition is also remarkable, when the leaf area index Fm equals 5 , the amount of transmission light tends to be steady and is optimal for the seedling, growth The theoritical analyses appear to be consistent conditions observed in field.
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