期刊论文

中文

长江流域资源与环境

1004-8227

2007

16

6

744-747

10.3969/j.issn.1004-8227.2007.06.010

湖北省教育厅重点项目“湖北榉树种群生态学研究”（2000A47002）；

本校为其他机构

对湖北省天然榉树的自然种群分布现状、种群特征及种群分布格局进行了研究.结果表明:湖北榉树资源主要分布在海拔500～1 000 m地带,不同程度地分割包围在谷底和山腰,地理分布点呈收缩集群分布,种群规模较小;采用方差/均值法对榉树地理分布格局类型进行分析,其值=1.66＞1,表明其分布点的地理分布趋于集群分布.湖北榉树种群星散间隔的地理分布形式,使地理分布点间产生空间间隔,成为相互间基因交错的障碍,而较小的种群规模,增加了遗传漂变的机率,导致遗传上的不稳定性增加,影响种群的生存能力,这些是导致物种趋向濒危的重要原因.湖北榉树种群这种分布现状产生的原因,一方面是物种自身的生物学特性及...

Natural population distribution status, population characteristics and population distribution pattern of natural Zelkova schneideriana in Hubei province were investigated in the present study. The results showed that Zelkova schneideriana resources in Hubei province mainly distributed in the altitude condition of 500-1 000 m,being divided or being surrounded in the bottom of valley and mountainside,and their geographical distribution showed a shrinking group pattern, with relatively small populations. Variance method and mean value method were employed to analyze the geographical distribution...