众所周知,皆伐迹地的更新有可能不用人工造林的方法,而在采伐时保留针叶幼树来完成。关于皆伐迹地上幼树对形成幼林的作用,已经有过足够的研究。但是,关于保留幼树对成熟林形成,对成熟林结构、粗成、生产率和经济价值的作用问题,研究得却不够充分。我们曾在鸟饭树林型的Ⅲ～Ⅳ地位级的混交林里,设置27块标准地进行调查研究。这些林分是 It is well-known that it is possible to replace deforestation with artificial afforestation instead of keeping young saplings at harvest. There have been enough studies on the role of saplings on clear-cuttings in clear-cut fields. However, there has been insufficient research on the role of saplings in the formation of mature forests, in the structure, maturity, productivity and economic value of mature forests. We have set up 27 standard places in the mixed forest of grade III-IV of the bird-watched forest. These stands are