Analysis on Diurnal Variation of Photosynthetic Index of Tung Forest with Different Growth Characteristics
The diurnal variation characteristics of photosynthetic indices of paulownia forest in Puding County,An-shun City,Guizhou Province were analyzed.The 5-year old tung forest was selected as the research object and divided into 3 groups according to its different growth,which were good growth group,general growth group and poor growth group,respectively.The change characteristics of photosynthetic index(transpiration rate,net photosynthetic rate and stomatal conductance)of different growth of tung forest were compared.The results showed that the daily variation characteristics of transpiration rate,net photosynthetic rate and stomatal conductance were basically the same among all groups.Among them,the transpiration rate,net photosynthetic rate and stomatal conductance in the good growth group were higher than those in the average growth group and the poor growth group(P＜0.05).1t can be seen from the results that there are significant differences in the daily variation characteristics of the photosyn-thetic indexes of Jatropha atropha forest with different growth potentials.The higher the photosynthetic indexes such as transpiration rate,net photosynthetic rate and stomatal conductiv are,the positive correlation between jatropha at-ropha forest and photosynthetic indexes is indicated.The higher the growth of jatropha atropha forest is,the stronger the photosynthesis is.Photosynthesis had a great effect on the growth of tung forest.
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