对南京现生银杏叶片的长枝阳叶、短枝阳叶和短枝阴叶的形态参数和叶脉参数进行观察和度量。结果显示: 长枝阳叶、短枝阳叶和短枝阴叶的叶脉密度分别为 14. 78 ± 2. 44 cm、16. 05 ± 2. 57 cm、15. 31 ±2. 34 cm，叶脉指数分别为 0. 090 ± 0.026、0. 098 ± 0. 037、0. 091 ± 0. 027，差别不显著。表明，银杏叶生长位置和光照强度对其叶脉参数影响不大。

It is measured the shape and venation parameters of sun and shade leaves on short- shoots and long- shoots of modern Ginkgo leaves in Nanjing，China． The venation density of these leaves are 14. 78 ± 2. 44 cm， 16. 05 ±2. 57 cm and 15. 31 ±2. 34 cm，respectively for the sun leaves on long- shoots，sun and shade leaves on short- shoots． The venation index of these leaves are 0. 090 ±0. 026，0. 098 ±0. 037 and 0. 091 ±0. 027，respec- tively． This indicates that the venation parameters are not influenced by whether they are born on short- shoots or long- shoots，and by where they live under sun or shade．