北京市区苔藓植物空间分布与环境关系的研究

在2006年10月至2007年10月期间,对北京市五环路内及附近部分区域的苔藓群落进行了调查,共调查了31个地点、164个样地,采集苔藓植物标本327份。经整理鉴定,调查区有苔藓植物12科24属55种,其中阔叶小石藓（Weisia planifolia）和立碗藓（Physcomitrium sphaericum）等种类为调查区的广布种。通过对调查区同类型、不同地点苔藓植物多样性指数分析,发现北京市苔藓植物的分布特点为城西、城北苔藓植物多样性高于城东、城南。用典范对应分析法（CCA）分析27个样地中的20种地面生苔藓植物的盖度与主要环境因子的关系,结果表明,土壤含水量、距主干道距离、人为踩踏、土壤pH值、林木郁闭度等环境因子对北京市苔藓植物的分布有显著影响,其中土壤含水量、土壤pH值对苔藓植物分布的影响最为显著,北京市区大多数常见苔藓种类喜生于土壤含水量较高、偏酸性的环境。

Relationship between Bryophytes Distribution and Environmental Factors in Urban Beijing

We studied the relationship between bryophytes distribution and urban environment in an area of Beijing.A total of 327 bryophyte specimens were collected from 164 plots of 31 sites along the fifth ring road and surrounding area in Beijing.The Shannon-Wiener indexes of bryophyte diversity in the different study sites were analyzed.Canonical Correspondence Analysis (CCA) was used to evaluate the ecological relationship between 20 species and their environmental factors in 27 simple sites.Some 55 taxa of bryop...