The photosynthesis of the tropical rainforest plant in the exhibition area with weak artificial illumination in Shanghai Science & Technology Museum was studied.
The results showed that illumination affected the growth rate and resistance of Azolla against black rot disease, both of which were lower under weak light (Tables 1,2).
According to the demands of crop and livestock for sunlight illumination condition, 4 zones, namely, dark light zone, weak light zone, moderate light zone and strong light zone were divided.