内蒙古白音敖包国家自然保护区种子植物多样性及区系研究

通过野外实地调查,结合标本鉴定和文献研究,对内蒙古白音敖包国家级自然保护区种子植物多样性和区系特征进行了统计分析,并对白音敖包自然保护区与周边4个地区(章古台、木兰围场、达里诺尔、乌斯吐)种子植物区系的相似性进行比较分析。结果表明:(1)白音敖包自然保护区植物物种多样性较为丰富,共有野生种子植物72科261属526种,但多样性却表现出一定的脆弱性。(2)在植物区系科的组成上,主要有8个优势科;属的组成则主要为单种属和寡种属,共计246属,占本区系总属数的94.26%;在生活型方面草本植物占绝对优势,而在水分生态类型的分布上中生植物最多。(3)在科、属的地理分布类型中,温带成分占绝对优势,区系温带性质明显;而且区系成分具有一定的古老性,但特有程度较低。(4)该研究区与邻近4个植物区系的属相似性分析发现,白音敖包自然保护区与达里诺尔的属相似系数最高,与乌斯吐相似性较低。

Study on Seed Plant Diversity and Flora in Baiyinaobao National Nature Reserve,Inner Mongolia

According to field investigation,specimens identification and literature survey,we studied and discussed the diversity and floristic characteristics of seed plants in the Inner Mongolia Baiyinaobao National Nature Reserve.Meanwhile,the comparison of flora similarity between Baiyinaobao and other four locations around (Zhangtutai,Mulan Poddack,Dalinuoer and Wusitu) was analyzed.The results showed that:(1)There are 526 species of wild seed plants which belonging to 261 genera and 72 families in the Baiyinaobao Nature Reserve.The species richness was relatively high,but vulnerable.(2)For the family composition of the flora,there are eight dominant families,and for genus composition,there are 246 monotypic and small-sized genera which accounting for 94.26% of the total genera.For the life forms,herbs were predominant and for the water ecotypes,the mesophytes were most abundant.(3)For the areal-types,the temperate elements were dominant and the flora was remarkably characterized by temperate zone in nature.On the other hand,the origin of some elements of the flora was ancient,but the endemic was low.(4)Compared with other four floras around,Baiyinaobao has the highest genera similarity with Dalinuoer,and has relative low similarity with Wusitu.