期刊文献+

Distribution Pattern Scale of Natural Toona ciliata Population

红椿天然种群分布格局尺度研究(英文)
下载PDF
导出
摘要 In order to research the population distribution pattern of endangered species Toona ciliata Roem., the sampling quadrats of 5 mx5 m and 3 m×3 m in size, accurate to 1 mxl m, were established in 2 newly-found only existing T. cili- ata Roem. communities (T1 and T2) with contiguous grid quadrate method, in the Nanhe River valley, Gucheng County. By X2 test, t-test of distribution coefficient Cx method, and F test of Morisita pattern index Iδ whether the distribution patterns of the T. ciliata Roem. populations conformed to Poisson distribution were checked. The results indicated that, population T1 was in Poisson distribution under 5 m×5 m and 3 m×3 m in size by Cx and 16 methods, but in clumped distribution pattern un- der 5 m×5 m in size by the Chi-square test; however, the population was in Pois- son distribution under the dimension of 3 m×3 m. Population T2 under human dis- turbance had higher population density, indicating clumped distribution under 3 above-mentioned tests. If Chi-square test is satisfied, a distribution pattern is in Poisson distribution, and size and quantity of sampling quadrats should be given pri- ority to; and if df is greater, both theoretical values and observed values tend to- wards normal distribution more probably, and the test of distribution pattern, there- fore will be more dependable. 为研究濒危物种红椿(Toona ciliata Roem.)的种群分布格局,在谷城南河流域对发现的仅有两个红椿种群(T1,T2),以相邻格子法设置5 m×5 m、3 m×3 m的样方,精确到1 m格子。通过χ~2检验、C_x的t检验、Morisita I_δ的F检验,对种群分布格局进行判断是否符合泊松分布。结果表明,T1种群在5 m×5 m、3 m×3m样方尺度下,C_x和I_δ均为泊松分布,5 m×5m尺度χ~2检验为集群分布,3 m×3 m尺度为Poisosn分布;干扰种群T2种群密度较大,3种检验均为集群分布。因此,分布格局满足χ~2检验的泊松分布,样方设置应注重尺度和数量;df越大,理论值与观测值更可能越接近正态分布,种群分布格局的检验更加真实可信。
作者 贺立 徐晓婷
出处 《Agricultural Science & Technology》 CAS 2017年第4期700-703,723,共5页 农业科学与技术(英文版)
基金 Supported by Public Welfare Research Project of Science and Technology Agency of Hubei Province(402012DBA40001)~~
关键词 Toona ciliata Roem. Natural population Distribution Pattern scale Testing method 红椿(Toona ciliata Roem.) 天然种群 分布格局尺度 检验方法
  • 相关文献

参考文献9

二级参考文献117

共引文献280

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部