川西高山天然林区,粗枝云杉数量多,材质好,生长快,占迹地更新的比重大,且开展了选优工作。在选优工作中使用现行的三株法、五株法、标准地法、优树标准表法、评分法、生长效率法、指数法选择优树,结果有的优树不优,有的落选,遇到了难以克服的困难。本实验从探索林木遗传型、环境 Natural forests in Western alpine mountains, the number of thick spruce branches, good material, fast growth, accounting for the proportion of major areas of renewal, and carry out the selection of excellent work. In the selection of the best use of the current three strains of the law, five strains of law, the standard method, the best tree standard table method, grading method, growth efficiency method, index method to select the superior tree, the result is not superior trees, and some unsuccessful , Encountered difficult to overcome. This experiment from exploring the forest genetic type, environment