杉木[Cunninghamia lanceolata (Lamb.)Hook.]是我国特有的优良速生针叶树种,分布范围广,栽培历史悠久,在商品木材生产中,一直占有重要地位。但是,在我国亚热带植被的自然演替系列中,杉木林的位置是不存在的。何景(1951)曾指出,照叶乔木林在发育过程中,虽然可以混杂一部分落叶树种或常绿针叶树种,但达到安定期的照叶乔木林就不再含有这 Cunninghamia lanceolata (Lamb.) Hook.] Is an excellent high-speed coniferous species unique to China. It has a wide distribution and a long history of cultivation. It occupies an important position in the production of commercial timber. However, in the natural succession series of subtropical vegetation in China, the location of Chinese fir forest does not exist. He Jing (1951) pointed out that according to the development of photosynthetic arbor forest, some deciduous tree species or evergreen conifer species may be mixed with each other, but the photosynthetic arbor forest reaching the stabilization period no longer contains this