内蒙古松树山的植物区系与沙地油松林群落特征

根据多次对内蒙古松树山地区的植物调查资料和沙地油松林群落学的研究，结果表明：(1) 松树山在植物区系上，正处在蒙古植物区系、华北植物区系、长白植物区系和达乌里植物区系的交汇地区。植物种类比较丰富，种子植物达394种。松树山植物的科、属、种分别占科尔沁沙地的61.1％、58.1％和41.1％;(2) 松树山植物区系地理成分以温带性质成分占绝对优势，占本地区的90.61％，其中以温带亚洲成分、旧世界温带成分和中国-日本成分最多，分别占本地区的16.8％、14.0％和13.7％;(3) 沙地油松林是松树山地区和科尔沁沙地唯一的针阔叶混交林类型，群落生活型谱以地面芽植物种类最丰富，占40.7％，其次为高位芽植物(22.2％)和地下芽植物(25.5％)。(4) 沙地油松林可划分为沙地胡枝子蒙古栎油松林和沙地山杏油松林2个类型，前者主要分布在石质沙丘上，后者多分布在固定沙丘的阴坡。群落演替进程为沙地先锋植物群落阶段→根茎禾草杂类草群落阶段→沙地灌丛群落阶段→沙地油松林阶段。

Flora in Songshu Mountains in Inner Mongolia and community characteristics of Pinus tabulaeformis forest

Based on the investigations of the flora in Songshu Mountains in Inner Mongolia and the study of the community characteristics of Pinus tabulaeformis forest,the following results were obtained:(1)From the viewpoint of flora,Songshu Mountains located at the transitional area of Mongolia flora,North China flora,Changbai flora,and Darhurica flora.There were plenty of plant species,including 394 spermatophytes.The numbers of the family,genus,and species of the plants occupied 61.1%,58.1%,and 41.1% of those on t...