摘要
在3个群落中设置样方,采用方差/均值比率法测定了薇甘菊种群的分布格局类型。结果表明,薇甘菊种群的分布格局主要受自身的生物学特征和微环境的影响,呈随机或集群分布。随机分布的种群其聚集强度指标扩散型指数、丛生指数、聚块性指标和平均拥挤度多对1.0没有显著的偏离,负二项参数则较大;而聚集分布的种群其聚集强度指标则符合聚集特征。
By means of variance/mean ratio method,the distribution pattern types of Mikania micrantha populations in three communities were analyzed. The results show that the distributions of the population are influenced mainly by its biological characteristics and microtopography,random or clumped. Using negative binomial parameter,index of clumping,index of mean crowing,index of patching and index of dispersion,population aggregated intensity was calculated. To randomly distributed population,there are no evident deviations of index of dispersion,index of clumping, index of patching and index of mean crowding from 1. 0,and the negative binomial parameter is high. To clumped populations, those are identical with the characters of clumped populations.
出处
《广西植物》
CAS
CSCD
北大核心
2003年第4期303-306,共4页
Guihaia
基金
广东省林业科技重点攻关项目(2000-01)
深圳市科技局项目(200001050)
国家自然科学基金重大项目(39899370)
关键词
外来杂草
薇甘菊
种群
分布格局
exotic weed
Mikania micrantha
population
distribution pattern
