Axial Tracheids Widening Across Vein Orders in <i>Ginkgo biloba</i> Leaves and Their Relationship with Hydraulic Path Length.

For all vein orders except 7° and 8°, significant differences in D were detected among the three sampling sites, with an overall trend of D being Beijing > Lanzhou > Lhasa ( Figure 1 ). 3.2.

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