前言调整林分的密度与结构是一项十分重要的经营措施。林分的合理密变随培育目的、林分年龄、立地条件等因素而变化。要傲到及时地合理调整林分密度,就必须探讨密度与林分其他测树因子间的数量关系及其动态规律,并用一定的数学图象综合地表现出来,以使营林工作建立在科学的、定量管理的基础上。迄今为止,在我省森林经营中,尚缺乏这样的数学图象,国内外曾对某些树种编制了这类数学图象,在日、美等国已经被应用到森林经营与造林中去了。由于我省杉木分 Preface Adjusting the density and structure of stand is a very important management measure. The reasonable density of forest stands varies with factors such as breeding purpose, stand age, site conditions and so on. To be proud to timely and reasonably adjust the stand density, it is necessary to explore the relationship between density and other measures of tree stand volume and its dynamics, and with a mathematical image of a comprehensive display to make silviculture work in science Based on quantitative management. To date, such mathematical images are still lacking in forest management in our province. Such mathematical images have been compiled for some tree species at home and abroad and have been applied to forest management and afforestation in Japan, the United States and other countries . As my province fir points