【摘要】 在徐家山和牛达林区进行了用不同苗龄的云南松苗木营造云南松人工幼林对其林木造林当年生长影响的研究。经对大苗(1.3~0,徐家山)和当年生苗(0.4~0,牛达)定植的云南松人工幼林造林当年林木的地径和树高生长量的分析,表明苗龄差异影响云南松人工幼林林木造林当年的生长:其两林分的林木平均地径和树高分别为1.63 cm、0.19 m,和0.57 cm、0.08 m。揭示了采用大苗造林可促进云南松人工幼林林木的生长。其林木的地径和树高生长线性相关显著,徐家山和牛达两林分的方程分别为Y=0.043 2x+0.123 1和Y=0.035 6x+0.062 4,其林木的树高可作为林分生长量分析的主要指标。此期间,云南松人工幼林林木的树高分化明显,徐家山和牛达林分的林木树高变幅和变异系数分别为0.03~0.61 m、0.01~0.26 m和1.08%、0.77%。树高聚类分级结果也显示两云南松人工幼林林木分化的客观存在。林木树高的变幅、其变异系数和聚类分级的组间和组内的变幅说明,用13~0苗龄营造的云南松人工幼林林木造林当年的树高分化较0.4~0苗龄的显著。其幼林林木的生长分化预示着进行云南松早期选育的可行性。更多还原

【Abstract】 The effects of seedling age on tree growth in Yunnan pine juvenile stand were studied by taking the forests in Xujiashan and Niuda forest farm as study materials.The age of seedlings in Xujiashan and Niuda were 13 months and 4 months respectively.The study results showed that the age of seedlings significantly affecting the growth of young trees,the average basal diameter of trees in Xujiashan and Niuda stand were 1.63 cm and 0.57 cm,the average height of trees were 0.19 m and 0.08 m respectively.Bigger seedlings were desirable for the growth of young stand.The liner correlation between basal diameter and height was significant,the correlation equation of Xujiashan and Niuda stand were Y=0.043 2x+0.123 1 and Y=0.035 6x+0.062 4 respectively,tree height was the dominant criterion in growth analysis.The differentiation of tree height of young stand was obvious,the change scope and variation coefficient of tree height of young trees in Xujiashan and Niuda stand were 0.03~0.61 m,0.01~0.26 m,1.08 % and 0.77 %.The results of cluster analysis also verified the existence of differentiation in young stands.Height differentiation was greater in stand established with 13 months old seedlings than stand established with 4 months old seedlings.The height differentiation implied the feasibility of early superior individual selection of Yunnan pine.更多还原