一、前言 所谓“生态组”就是对环境要求近似若干种的集合。树种生态组是一种普遍的自然现象,若干树种聚集一起,有着一定结构和生态环境。目前珍贵阔叶树人工林生长不良的原因,主要是缺乏树种混交,林分结构单纯,不能形成适合它们生长的林分生态 First, the foreword The so-called “ecological group” is the collection of several environmental requirements approximation. Tree species ecological group is a common natural phenomenon, a number of species gathered together, with a certain structure and ecological environment. At present, the reasons for the poor growth of the precious broad-leaved tree plantations are mainly the lack of mixed tree species, simple stand structure, and the inability to form the stand ecologies suitable for their growth