Abstract
The aim this research work was to assess the intensity of photosynthesis at the leaf level of 3 common plant species: Ceriops zippeliana, Excoecaria agallocha, Avicennia officinalis, natural origin in a Can Gio mangrove forest. From May 2020 to September 2020, the databases of diurnal dynamics of the intensity of photosynthesis and PAR (Photosynthetic Active Radiation) for different parts of the tree crown were investigated. The Michaelis - Menten equation was used to describe the dependence of photosynthesis on PAR. The coefficients equation was used to assess the photosynthetic characteristics of the tree leaf. The study showed that the decline of leaf photosynthetic capacity in all 3 subjects studied may be due to the cumulative decline of chlorophyll fluorescence. Photosynthetic intensity of the 3 plant species has different variation according to environmental factors but generally depends on leaf temperature and PAR. Specifically, the optimum temperature for the growth of C. zippeliana is between 29 and 33°C with An (Photosynthetic yield) between 12.8 and 15.4 mol m-2s-1; optimum temperature for the growth of E. agallocha is from 28 to 31ºC with An in the range of 4.5 to 9.6 mol m-2s-1; the optimum temperature for growth of A. officinalis are 2 temperature ranges from 28 to 31ºC for leaves at the top and from 26 to 28ºC for leaves in the middle and under the canopy. Based on the obtained correlations, mathematical models of photosynthetic intensity as a function of PAR and leaf temperature were developed. In general, the results show that the inhibitory factor affecting photosynthesis can be the amount of photosynthetic irradiance that is higher than the allowable level and the deviation of leaf temperature from the optimal values for plant growth development of C. zippeliana, E. agallocha, A. officinalis.
Published Version
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