濒危植物香果树幼苗空间格局及数量动态研究
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国家自然科学基金(31360145);江西省教育厅科技计划项目(GJJ08463)


Spatial Distribution Pattern and Number Dynamics of Emmenopterys henryi Seedlings Endangered in China
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    摘要:

    采用相邻格子样方法采集数据,应用理论分布模型、分布系数法、Morisita格局指数法、聚集强度指数以及Greig-Smith区组均方方法研究了香果树幼苗种群空间格局,结果表明:(1)濒危植物香果树幼苗呈聚集分布,聚集强度受区组尺度的影响较大,随尺度的增加而减小;不同幼苗种群格局强度随着纬度增加,也呈现下降的趋势。(2)Greig-Smith区组均方法研究显示,香果树种群在8~16 m2和50~64 m2处聚集;香果树幼苗大小结构呈现出高度在0~40 cm范围内幼苗较多现象,但经过强烈的环境筛选,大部分生长未达到120 cm而死亡。(3)主成分分析表明,香果树幼苗受乔木盖度、灌木盖度、光照强度以及大气的温湿度影响较大。因此,建议加强香果树原生生境的保护,严禁对香果树幼苗进行滥砍、滥伐、放牧等破坏;通过降低乔木层和灌木层盖度,清理林下枯落物、苔藓等,增加林下光照强度,建立小面积林窗,促进香果树幼苗发育。

    Abstract:

    Based on the method of contiguous grid quadrate,the Emmenopterys henryi seedlings field data were sampled,I studied the spatial distribution of them by using the tests of discrete distribution pattern,dispersal index,Morisita’s pattern index,aggregation intensity and Greig-Smiths’ mean variance method.The result showed that the distribution pattern of E.henryi seedlings was clustering.The aggregate intensity was affected greatly by group scale,and dropped with the scale increasing.The trend of the aggregate intensity also declined with the increase of altitude.It was displayed that E.henryi seedlings clumped in 8-16 m2 and 50-64 m2 from Greig-Smiths’ mean variance analysis.A large number of E.henryi seedlings were less than 40 cm tall,and most of them died before the height of 120 cm due to the strong environmental screening.The tree coverage,shrub coverage,intensity of illumination,atmosphere temperature and atmosphere humidity were the main factor affecting on the growth,survival and distribution of E.henryi seedlings by principal component analysis.In order to promote E.henryi seedlings development,native habitat should be protected and the natural regeneration should be strengthened through by thinning,cleaning up the moss,litter and others.

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郭连金.濒危植物香果树幼苗空间格局及数量动态研究[J].西北植物学报,2014,34(9):1887-1893

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  • 在线发布日期: 2014-10-15
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