The first progeny test on 131 plus-tree progeny families of Fokienia hodginsii selected from Fujian Province and Hunan Province was carried out in State-owned Forest Farm of Yong’an, Fujian. The average seedling heig...The first progeny test on 131 plus-tree progeny families of Fokienia hodginsii selected from Fujian Province and Hunan Province was carried out in State-owned Forest Farm of Yong’an, Fujian. The average seedling height and seedling base diameter at one-year-old were 31.73*!cm and 4.05*!mm respectively. With statistical methods,such as variance and correlation analysis, the genetic variations of F. hodginsii were studied based on the investigation of one-year-old seedling traits from different families. The results showed that there were abundant variations within F. hodginsii and very significant differences among families in seedling height and base diameter. The variations in seedling height were more than those in seedling base diameter which were mainly controlled by genetic factors. There were very significant correlations among seedling heights at different stages based on the average total seedling height every 15 days. Genetic correlation coefficient was a good index to reveal the relationship among traits. The net growth of seedling height showed great difference at different stages. Its value was small at early stage and reached peak from August 30 to September 15 and from October 30 to November 15. But the net growth of seedling base diameter showed little difference at different stages. Its value ranged from 0.17*!mm to 0.22*!mm every 15 days. According to the seedling height, 15 excellent families were preliminarily selected from 131 tested families. The average genetic gains of 15 excellent families’seedling height and base diameter were 30.00% and 10.12% respectively. The averages of 15 excellent families’seedling height and base diameter were 42.1*!cm and 4.7*!mm respectively. The selection effect was very striking.展开更多
Study on shooting and growth rhythm of Pseudosasa japonica var. tsutsumiana resulted that shooting period was from March 3 to May 5, and shoot quantity accorded with partial normal distribution.Adult bamboo reached 70...Study on shooting and growth rhythm of Pseudosasa japonica var. tsutsumiana resulted that shooting period was from March 3 to May 5, and shoot quantity accorded with partial normal distribution.Adult bamboo reached 70.19%. The height growth could be divided into initial, ascending, boosting and terminal stage.Daily increment of height growth was 1～2 cm at the initial stage(about 11 d), 2～3 cm at the ascending one(12 d), more than 3 cm at the boosting one(19 d). The maximum was 4.45 cm at boosting stage. By the terminal stage (4 d), the height growth decreased obviously and stopped rapidly at last. Height growth process of young bamboo accorded with the Logistic Equation. But the height growth was influenced by the underground temperature of 10 cm and 15 cm, as well as average daily temperature and the humidity, especially the underground temperature of 10 cm and 15 cm which had positive correlation with the daily increment of height growth.展开更多
文摘The first progeny test on 131 plus-tree progeny families of Fokienia hodginsii selected from Fujian Province and Hunan Province was carried out in State-owned Forest Farm of Yong’an, Fujian. The average seedling height and seedling base diameter at one-year-old were 31.73*!cm and 4.05*!mm respectively. With statistical methods,such as variance and correlation analysis, the genetic variations of F. hodginsii were studied based on the investigation of one-year-old seedling traits from different families. The results showed that there were abundant variations within F. hodginsii and very significant differences among families in seedling height and base diameter. The variations in seedling height were more than those in seedling base diameter which were mainly controlled by genetic factors. There were very significant correlations among seedling heights at different stages based on the average total seedling height every 15 days. Genetic correlation coefficient was a good index to reveal the relationship among traits. The net growth of seedling height showed great difference at different stages. Its value was small at early stage and reached peak from August 30 to September 15 and from October 30 to November 15. But the net growth of seedling base diameter showed little difference at different stages. Its value ranged from 0.17*!mm to 0.22*!mm every 15 days. According to the seedling height, 15 excellent families were preliminarily selected from 131 tested families. The average genetic gains of 15 excellent families’seedling height and base diameter were 30.00% and 10.12% respectively. The averages of 15 excellent families’seedling height and base diameter were 42.1*!cm and 4.7*!mm respectively. The selection effect was very striking.
文摘Study on shooting and growth rhythm of Pseudosasa japonica var. tsutsumiana resulted that shooting period was from March 3 to May 5, and shoot quantity accorded with partial normal distribution.Adult bamboo reached 70.19%. The height growth could be divided into initial, ascending, boosting and terminal stage.Daily increment of height growth was 1～2 cm at the initial stage(about 11 d), 2～3 cm at the ascending one(12 d), more than 3 cm at the boosting one(19 d). The maximum was 4.45 cm at boosting stage. By the terminal stage (4 d), the height growth decreased obviously and stopped rapidly at last. Height growth process of young bamboo accorded with the Logistic Equation. But the height growth was influenced by the underground temperature of 10 cm and 15 cm, as well as average daily temperature and the humidity, especially the underground temperature of 10 cm and 15 cm which had positive correlation with the daily increment of height growth.
