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Relationship between net photosynthetic rate and photosynthetic parameters for Juglans hopeiensis Hu 'Yihe 1'.

The net photosynthetic rate (P N ) and photosynthetic parameters of Juglans hopeiensis Hu were studied by an open gas analysis system (CI-301PS) in the orchard. The results are as follows: (1) the diurnal change of P N in J. hopeiensis had a small significant positive correlation with leaf temperature (TL), stomatal conductance (g s ), photosynthetic available radiation (PAR), and transpiration rate (E), and had a negative correlation with intercellular CO 2 concentration (C i ). (2)The seasonal change of P N in J. hopeiensis had a significant positive correlation with chlorophyll (Chl) content, and a strikingly negative correlation with intercellular CO 2 concentration. (3) The P N values of J. hopeieusis Hu were lower than that of Juglans regia L. and similar to that of Juglans mandshurica Max.