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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。
In Xujiashan and Niu Dalin district, Yunnan pine seedlings with different seedling ages were used to study the effects of artificial Pinus yunnanensis young plantations on the current year’s afforestation. The analysis of root diameter and tree height growth of the Pinus yunnanensis young plantations planted with large seedlings (1.3-0.0 Xujiaoshan) and current yearlings (0.4-0, Beida) showed that the difference in seedling age affected Yunnan pine Growth of Artificial Young Forest During the year of afforestation, the mean diameter and tree height of the trees in the two stands were 1.63 cm, 0.19 m, 0.57 cm and 0.08 m, respectively. Revealed that the use of seedlings afforestation can promote Pinus yunnanensis plantation young forest growth. The tree diameter and tree height growth had significant linear correlation. The equation of Xujiashan and Niuda reached two stands of Y = 0.043 × 0.123 1 and Y = 0.035 6 × + 0.062 4, respectively. The tree height of forest could be used as stand growth The main indicators of quantitative analysis. During this period, the tree height differentiation of the Pinus yunnanensis young plantations was significant. The tree height heights and coefficients of variation of the Xujiashan and Niu Dalin were 0.03-0.61 m, 0.01-0.26 m, 1.08% and 0.77%, respectively. Tree height clustering grading results also showed objective existence of tree differentiation of two Pinus yunnanensis young plantations. The variation of tree height, its coefficient of variation, and the amplitude of variation within the cluster classification and within the group indicated that the tree height differentiation of the plantation of Pinus yunnanensis young plantations at the age of 13 to 0 was 0.4 to 0 years old Significant. The growth and differentiation of young trees indicate the feasibility of early breeding of Pinus yunnanensis.