前言我省森林覆盖率为24.9％,其中65％左右为云南松林,每年的商品材生产则90％以上均为云南松木材。云南松木材质量的优劣直接关系到各项工程建设质量的好坏和成本的高低。为了充分地利用森林资源,在中龄和成熟的云南松林内进行常年采脂或伐前强度采脂是必要的作业手段。但采脂对云南松木材的物理力学性质究竟有无影响或影响的程度 Preface Forests in our province is 24.9%, of which about 65% of Yunnan pine forest, annual production of more than 90% of timber products are Pinus yunnanensis wood. The quality of Yunnan pine wood quality is directly related to the quality of the project construction quality and cost of the level. In order to make full use of forest resources, it is necessary to carry out perennial fat harvesting or cutting fat harvesting in middle-aged and mature Yunnan pine forests. However, the physical and mechanical properties of the pine needles have any effect or extent of influence