Differences in the Functional Traits of <i>Populus pruinosa</i> Leaves in Different Developmental Stages.

Changes in Endogenous Hormones Content of Leaves After comparing the contents of endogenous hormones in leaves of different diameter classes ( Figure 6 ), we found that the contents of IAA and ZR showed an increasing trend with increasing diameter class; meanwhile, the content of ABA showed a decreasing trend.

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The Pn, Tr, and Gs values of the leaves of each diameter class gradually increased with increasing leaf height; the difference between the highest leaf height of each diameter class and the 2 m leaf height was significant, whereas the Ci showed a decreasing trend ( Figure 3 ).

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