通过样地法对北京市四座楼自然保护区的植被进行了调查,在本底调查的基础上分析了四座楼自然保护区维管植物的区系成分和植被分布规律。该保护区有北京新记录种1个:麦李(Prunus glandulosa Thunb.);国家三级保护植物3种,即:紫椴(Tilia amurensis Rupr.)、黄檗(Phellodendron amurenseRupr.)和刺五加〔Acanthopanaxsenticosus (Rupr.etM axim.)Harm s〕;并分布有较大面积的天然侧柏〔Platycladus orientalis(L inn.)Franco〕林。该保护区共有维管植物约869种,分别属于127科431属,其中蕨类植物共有16科19属33种,裸子植物共有3科4属4种,被子植物共有108科408属832种,其中野生植物有772种,占北京所具有的野生植物种类的1/3以上。四座楼自然保护区野生种子植物共有15个分布区类型,其中北温带分布类型最多,表明本保护区的植物分布具有温带性质。

Using sampling method, the floristic elements of wild vascular plants, the rules of vegetation distribution and the distinguishing features of vegetation in the Sizuolou Nature Reserve of Beijing City were analyzed. One new record species in Beijing, Prunus glandulosa Thunb., was found. There were three national protected plants(Ⅲ classes), which were Tilia amurensis Rupr., Phellodendron amurense Rupr. and Acanthopanax senticosus (Rupr. et Maxim.)Harms. There were 869 tracheophyte, belonging to 431genera and 127families, among them with 33 ferns belonging to 19 genera and 16 families, 4 gymnosperms belonging to 4 genera and 3 families and 832 angiosperms belonging to 408 genera and 108 families. 772 wild species in the reserve occupied more than one-third of vascular plants in Beijing. There were 15 distribution types at genus level, in which the northern temperate distribution type was dominant, showed the floristic elements in the reserve possesses temperate characteristics.