Structural and Functional Responses of the Heteromorphic Leaves of Different Tree Heights on <i>Populus euphratica</i> Oliv. to Different Soil Moisture Conditions.

Change in Morphological Traits of Heteromorphic Leaves with Tree Height Under the conditions of suitable soil moisture and drought stress, the heteromorphic leaf LA showed an increasing trend with the increase in tree height ( Figure 1 b), the LI at 2 m was significantly larger than other heights, and the LT at the crown height (6 m, 8 m, and 10 m) was significantly larger than that at the lower part ( Figure 1 a,c).

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These results indicate that leaf area, leaf thickness, fence tissue, palisade-to-sea ratio, main vein xylem area, vessel area, net photosynthetic rate, transpiration rate, and proline, MDA, IAA, GA 3 , and ZR contents showed a positive correlation with the tree height under the two soil moisture conditions, but leaf shape index, leaf water potential (LWP), and ABA content showed a decreasing trend.

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