辽西走廊白狼山保护区植物区系及其与邻近山地的关系

采用植物区系谱、排序分析、聚类模型和相关性等方法,研究了辽西白狼山植物区系属的地理组成以及与其它山地的相似关系,以揭示多个山地植物区系的相互关系及分布格局。结果表明:(1)白狼山自然保护区野生种子植物多样而丰富,共有101科394属790种;被子植物占总种数的98.35%,优势科现象明显,寡种属和单种属占优势,呈现一定残遗性;(2)属的地理成分以温带成分为主,共有273属,占总属数的81.3%,处于中国-日本森林植物亚区暖温带-温带过渡范围内,植物区系划归于华北植物区系平原山地亚地区。(3)相关分析表明,白狼山与努鲁儿虎山(r=0.999)、东灵山(r=0.998)之间的植物区系具有极显著相关关系;主坐标排序和聚类分析表明,白狼山种子植物属的分布区类型与努鲁儿虎山、东灵山、小五台山以及雾灵山等有着较大的相似性,不同纬度水热条件可能是影响植物区系地理分布格局的重要因素。

Floristic Compositions of Spermatophyte in Bailangshan Natural Reserve and the Similarity with Other Mountains

In this paper,the floristic relationships between Bailangshan and other flora were analyzed.Based on Plot survey,floristic spectrum,cluster analysis and principal coordinates analysis(PcoA),I investigated the elements of seed plants in Bailangshan and the similarity of others flora.The results showed that:(1)it is abundant in wild species in Bailangshan,the types of distribution are various and complex.790 species in 101 families and 394 genera were identified,Angiosperm accounted for 98.35% of the total of seed plants.It is notable in dominant family phenomenon,Oligotypic and monotypic genera are abundant,which show some relict.(2)A total of 273 temperate areal-types that accounted for 81.3% of seed plants genera,The types of geographical distributing composition are various and complex,temperate floral elements are dominant,which have something in common with tropical flora.The present data indicated Bailangshan should belong to North China flora and the region should belong to the East Asia zone representing the feature of transition from warm temperate to temperate areal-types.(3) Floristic correlation between Bailangshan and Nuluerhushan,Donglingshan are significant at the 0.01 level,and the coefficients are 0.999 and 0.998,respectively.Based on two-dimensional scatter plot of PcoA and dendrogram based on the floristic spectrum,the similarities were obvious between Bailangshan and Nuluerhushan,Xiaowutaishan,Donglingshan and Wulingshan of the 12 moutains in this study.The hydrothermal and heterogeneous condition is an important determining factor in geographical distribution pattern.