Abstract:

In order to provide scientific basis for cultivation of S. chinensis, diurnal changes of the net photosynthetic rate, relationship between diurnal changes of net photosynthetic rate and effect of environmental factors were studied. Diurnal changes of net photosynthetic rate and environmental factors in leaves of S. chinensis and effect of environmental factors on net photosynthetic rate were investigated by CI-340 portable photosynthesis system. The results showed that compared with artificial cultivation, LSP, LCP, CSP, CCP and SLM of bionic cultivation were on descent tendency, while AQY and Chla/b were ascent tendency. Furthermore, the artificial cultivation mode of S. chinensis appeared “siesta of photosynthesis”, while it did not happen under bionic cultivation mode. Under bionic cultivation mode, the leaves of S. chinensis had a strong adaptation of photosynthesis. In addition, intensity of photo (PAR), environmental CO2 density (Ci), Tleaf and RHin were main environmental factors influencing diurnal changes of net photosynthetic rate of two cultivation modes.