5个欧美杨无性系21年来生长特性的研究

Research on Growth Feature of 5 Clones of Populus×euramericana(Dode)Guinier

１９６４年３月，在陕西省杨陵地区西北林学院的教学实验苗圃，采用１年生扦插苗，对健杨、莱比锡杨、科伦１５８杨、撒尔红杨、五月杨等５个欧美杨无性系，进行造林试验，株行距２ｍ×４ｍ，对其生长特性进行了长期研究，至１９８４年３月，历时２１年。结果为：①对５个欧美杨无性系的带皮胸径、树皮率、树高、去皮胸径、去皮材积、带皮材积等进行的方差分析表明，其差异均达到显著或极显著水平，这是由它们的遗传基础不同造成的；②２１年生时的材积，由大到小依次是科伦１５８杨、莱比锡杨、健杨、五月杨和撒尔红杨；③在２ｍ×４ｍ的株行距下，在生长特性上，科伦１５８杨早晚期均速生，健杨早期速生，莱比锡杨晚期速生；④无性系的生长受年降水量或生长季节的降水量及降水分布均匀程度的影响较大。

In March 1964,five clones of P.×euramericana (Dode) Guinier cv.“Robusta',P.×euramericana (Dode) Guinier cv.“Leipizig”,P.×euramericana (Dode) Guinier cv.“Granpaer selsktion',P.×euramericana (Dode) Guinier cv.“Sarce Rouge' and P.×euramericana (Dode) Guinier cv.“Marilandica' were afforested in nursery of Northwestern Forestry College of China by using one year old cuttings,with the spacing in a row and row spacing of 2m and 4m respectively.From then till March 1984,twenty one years'researches on the growth features of these 5 clones indicated as following 4 points.1)The results of variance analysis show that the differences of diameter outside bark,percentage of bark,tree height,diameter inside bark,volume inside bark,volume outside bark between different clones are all significant or very significant.These results are caused by the differences of hereditary basis. 2)The 21 year old volume of these 5 clones decrease in the order of P.×euramericana (Dode)Guinier cv.“Granpaer selsktion',P.×euramericana (Dode)Guinier cv.“Leipizig”,P.× euramericana(Dode)Guinier cv.“Rubusta”,P.×euramericana (Dode)Guinier cv.“Marilandica' and P.×euramericana (Dode)Guinier cv.“Sarce Rouge'.3)Under the plantation density of 2m×4m,P.×euramericana (Dode)Guinier cv.“Granpaer selsktion'grows fast both in early and late period,P.×euramericana (Dode) Guinier cv.“Robusta' growsfast in early period while P.×euramericana (Dode) Guinier cv. “Leipizig'grows fast in late period.4)sonme climatic factors such as annual precipitation or precipitation within growth seasons and the distribution of rainfall amount affect the growth of these 5 clones significantly.