一平浪林场云南松单株木生长规律初步研究

Preliminary Study on the Growth of Single Plant of Pinus yunnanensis in Yipinglang Forest Farm

通过对一平浪林区云南松的林分调查以及树干解析，分析了林分的树高、直径生长过程，结果表明，云南松生长发育过程可划分为苗木生长初期。树高速生期、直径速生期、速生后期和成熟期5个生长阶段。前5年为苗木生长初期，5～10a是林分开始郁闭，高生长明显加快，10～25a期间，云南松直径生长量也开始达高峰期，需要加强抚育管理措施；25～45a期间．直径旺盛生长，树高保持一定生长量，而材积生长量保持最大。其后云南松进入速生后期，生长渐趋于缓慢．但仍保持较高的生长量。表明云南松速生期较长，可作长轮伐期经营，是培育大径材的理想树种。

Stem analysis of Pinus yunnanensis was conducted in terms of height growth and diameter growth. The result showed that growth of Pinus yunnanensis can be divided into five stages： initial growth, fast height growth, fast diameter growth, later fast growth and mature. The first five years is the initial growth, with year five to year ten to be the time of forest closure, with fast growth. Year ten to year twenty-five is the fastest growth period of diameter, needing thinning management. From year 25 to year 45, timber volume increment reaches highest, followed by slow growth of later period. The result also showed that Pinus yunnanensis has a long period of fast growth and can be regarded as the ideal tree for rotated cutting.