论文部分内容阅读
收集油松分布区范围内的种源 4 5个 ,经两次全分布区及局部分布区历时 1 8年试验结果表明 ,种源间生长和适应性状差异显著 ,种源与立地存在一定的交互作用 ,种源高生长与年龄、冠幅呈极显著的正相关。据 1 7个变量的主分量分析 ,参试种源分为速生型、中生型和慢生型 3类 ,黄陵、洛南、南召 3个最优种源平均树高、胸径和材积的遗传增益分别为 6 5%、1 0 2 %和 2 6 4%,增产效益显著。陕西、河南一带的种源适应性强、生长速度快 ,是甘肃今后油松调种的主要范围 ,分布在边缘地带的油松种源生长普遍较慢 ,一般不宜采用
45 provenances were collected in the distribution area of Pinus tabulaeformis, and the results of 18-year experiment after two times of full distribution and local distribution showed that there was significant difference in growth and adaptation between provenances, with some interaction between provenances and sites Effect, provenance growth and age, crown was extremely significant positive correlation. According to the principal component analysis of 1 7 variables, the provenances were divided into three types: fast-growing type, moderate-type and slow-growing type. The average height, DBH and volume of the three best provenances in Huangling, Luonan and Nanzhao The genetic gains were 65%, 102% and 246% respectively, and the yield increase was significant. The provenances in Shaanxi and Henan have strong adaptability and fast growth, which is the main range for the adjustment of Pinus tabulaeformis in Gansu. The growth of Pinus tabulaeformis seedlings distributed in the marginal zone is generally slow, and generally should not be used