江西宜丰县官山穗花杉群落特征初步研究

穗花杉Amentotaxus argotaenia(Hance) Pilger是第三纪残遗物种，属濒危植物.对江西宜丰县官山穗花杉群落特征进行了初步研究.结果表明穗花杉群落结构明显，可分为乔木层、灌木层和草本层，其中，乔木层可分为3个亚层；组成穗花杉群落的乔木共33种，其中，穗花杉株数最多，相对频度最高，相对多度最大，重要值最大；穗花杉群落结构比较完整，各径级保存了一定株数，该群落正处于顺向演替阶段，幼树和中龄树占优势，发展趋势良好，只要保持群落完整，演替将会继续下去.

Preliminary Study of the Community Characteristics of Amento taxu argotaenia (Hance)Pilger in Guanshan,Yifeng County

Amentotaxu argotaenia (Hance)Pilger is one of the relic species of Tertiary Period and one of the endangered plants.A preliminary study of the community characteristics of Amentotaxu argotaenia (Hance) Pilger is made.The results are as follows.The community structure of A.argotaenia (Hance)Pliger is obvious,and can be divided into tree stratum,shrub stratum and herb strarum.The tree stratum again can be divided into three subhorizons.The Amrntotaxu argotaenia community is compsoed of 33 arbor species,among them the tree numbers of Amrntotaxu argotaenia are the majority,and their relative ferquency,relative abundance and importance are at the highest level amang the whole tree species that form the community.The community structure of Amrntotaxu argotaenia is in a perfect status and there exists a large number of A.argotaenia trees in every diameter class,and the young trees and middle trees of A.argotaenia are in a dominant position\. Therefore,the community is at the stage of progressive succession. As long as its perfection is maintained,the progressive succession will go on.