Response of Leaf Traits and Photosynthetic Fluorescence Characteristics of <i>Fraxinus malacophylla</i> Seedlings to Rainfall Patterns During Dry and Rainy Seasons in Southwestern China.

At the beginning of the dry season, F0 under 5 days treatment showed a significant trend of decreasing and then increasing with the increase of rainfall ( p < 0.05), and it was 29.32% and 21.75% higher than that of natural rainfall and rain increment, respectively; PI under 5 days treatment showed a trend of increasing and then decreasing with the increase of rainfall, with a significant difference ( p < 0.05), and it reached a peak under natural rainfall, which was 3.00 times that of rain increment and 70.11% higher than that of rain decrement.

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Extending the rainfall interval at the beginning of the rainy season significantly reduced Fm; throughout the rainy season, Gs, Ci, and Tr basically showed a decreasing trend with increasing rainfall, reaching the highest under the W‐treatment and mostly higher at 5 days than at 10 days.

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Most of the leaf photosynthetic parameters remained high; for WUE, it showed a decreasing trend with the increase of rainfall in 5 days of treatment and an increasing trend with the increase of rainfall in 10 days of treatment; for Ci, it showed an increasing trend with the increase of rainfall in 5 days of treatment and a decreasing trend with the increase of rainfall in 10 days of treatment, that is, there is a phenomenon that Ci increases when Pn decreases.

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