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一、前言云南松(Pinus yunnanensis Franchet)是广西西北部的主要用材树种之一,构成广大的天然林区。云南松生长迅速,树干通直,材质优良,不但是良好的用材树种,还能提取松脂、挥发油、单宁,并能制取酒精、人造纤维、纸浆等贵重产品。因此,可以说是经济树种之一。云南松除在云南高原为其分布中心外,在四川、贵州也有其分布,而广西则分布在隆林、田林、凌乐、天峨、百色等县;位于东经104°36′—106°55′,北纬24°10′—25°10′之间的地区,
I. Introduction Pinus yunnanensis Franchet is one of the main timber species in the northwest of Guangxi and constitutes a vast natural forest area. Pinus yunnanensis grows rapidly, the tree trunk is straight and the material is good. It not only is a good timber species, but also can extract turpentine, volatile oil and tannin, and can produce valuable products such as alcohol, man-made fiber and pulp. Therefore, it can be said that one of the economic species. Yunnan pine is distributed in Sichuan and Guizhou except for the Yunnan plateau, while Guangxi is also distributed in Longlin, Tianlin, Lingle, Tian’e and Baise counties; the longitude 104 ° 36’-106 ° 55 ’, Latitude 24 ° 10’-25 ° 10’ between the area,