Abstract:

The change of ecological factors in greenhouse and its effect on Photosynthetic characteristics of decorative 'Dennis' pineapple were studied. The results showed: Diurnal variations of atmospheric CO2 in greenhouse and the CO2 concentration between plants of greenhouse are different, Which reach the maximum in the morning 7:30 and afternoon 17:30 respectively; The diurnal change of photosynthetically active radiation of different position leaves in greenhouse Pineapple is the same, maximum appear at 11:30 in the morning, and the upper leaves>middle leaves>lower leaves; the maximum photosynthetic rate of different position leaves followed: which of upper leaves is 2.16 μmol/(m2?s) at 8:30 in the morning, which of middle leaves is 2.16 μmol/(m2?s) at 9:30 in the morning, which of lower leaves is 1.46 μmol/(m2?s) at 11:30 in the morning. The diurnal change of stomatal conductance and transpiration rate of the different position leaves are the same trend as the photosynthetic rate. In short, solar energy utilization and photosynthetic capacity of middle leaves of pineapple are the strongest, and the actual photosynthetic rate of the group leaves is not only in connection with the distribution of light intensity, but also with the ecological factors in the greenhouse.