前言杉木是我省予南地区的主要造林树种之一,人工林面积达40余万亩。由于这里是杉木自然分布的北界,所以对环境条件要求、生长特点、经营管理技术与中心产区都有很大不同。五十年代营造的杉木林到七十年代初急需进行抚育间伐。由于我省对杉木林的抚育间伐没有进行过系统的研究,因此,我们于1973年在黄柏山林场建立了三组十一块总面积0.66公顷的杉木间伐固定观测标准 Foreword Chinese fir is one of the main afforestation species in the south of our province, with an area of ​​more than 40 million mu of plantation. Because here is the natural distribution of the northern boundary of the fir, so the environmental conditions, growth characteristics, management techniques and production areas are very different. Fir woods built in the 1950s were urgently needed for tending and thinning in the early 1970s. Since we did not conduct any systematic research on the thinning of fir forests in our province, we set up three sets of eleven fixed observation standards for fir thinning of 0.66 hectares at Huangbaishan Forest Farm in 1973