The Growth Comparison of 2 Years Seedlings of Pinus yunnanensis with Different Stem Types

The seeds of 2 different stem types of Pinus yunnanensis, the straight and bend/twisted plant were collected from 3 sampling sites of Yiliang, Xinping and Lufeng in Yunnnan Province, sow seeds raise seedling. Two years seedlings of 2 different stem types of P.yunnanensis were measured in order to learn the difference of seedling growth. The results showed that the average of seedling height, ground diameter, branch height and length of needles of the straight type of P.yunnanensis generation of nursery seedling were 12.63 cm, 11.94 mm, 4.30 cm and 22.77 cm, respectively, the bend/twisted type indexes were 13.88 cm, 11.99 mm, 5.33 cm and 22.70 cm, respectively; and the straight type indexes of the average coefficient of variation were 41.60%, 37.96%, 105.90% and 20.13%, respectively, the bend/twisted type were 44.24%, 39.41%, 118.12%, 20.43%, respectively. The various growth index between 2 stem types was different, there was extremely significant difference between them in the seedling height, was significant differences in branch height, and no significant difference in ground diameter and length of needles; the differences in growth indicators of different sampling sites within the same type reached extremely significant levels.