摘要
应用地统计学中的半方差分析方法对4种群落类型华北驼绒藜种群的空间分布格局进行研究。结果表明:华北驼绒藜种群Ⅰ(华北驼绒藜+小叶锦鸡儿+短花针茅+多根葱群落)和种群Ⅱ(华北驼绒藜+大针茅+冷蒿+糙隐子群落)半变异函数曲线为球状和高斯模型,空间分布格局为聚集型,种群较稳定;种群Ⅲ(华北驼绒藜+大针茅群落)和种群Ⅳ(华北驼绒藜+羊草+杂类草群落)半变异函数曲线为线形,空间分布格局为随机型,种群呈增长型。对种群分布格局形成有重要影响的15个环境因子的主成分分析表明,群落总盖度、华北驼绒藜种群密度、驼绒藜种群分盖度、坡度、土壤速效氮、土壤速效磷、年平均降雨量和人为干扰度是影响种群分布格局形成的最重要因素。
Study the relationship between spatial distribution pattern of four habitat populations Ceratoides arborescens and environment factors by simi-variance analysis. The result showed that the semivariograms of population I （Caragana microphylla Lam, Stipa breviflora, Allium polgrrhizum community）and population II （Stipa grandis,Aremisa frigida, Cleistogenes squarrosa community） could be described as spherical and exponential model, the spatial distribution pattern showed aggregated , and the two habitats population are stabe. The semivariograms of population Ⅲ （Ceratoides arborescens and Stipa grandis community） and population Ⅳ （ Ceratoides arborescens L. chinensis, Mesopnystil Herb community） could be described as linear model, the spatial distribution pattern showed random, and the two habitats population are increasing. The main ingredient analysis result showed that Ceratoides arborescens mean density, soil available nitrogen, soil available phosphorus, annual precipitation and intensity of human disturbance are the most factors for Ceratoides arborescens distribution pattern of fifteen environment factors.
出处
《种子》
CSCD
北大核心
2009年第3期5-9,共5页
Seed
基金
国家自然科学基金"华北驼绒藜生殖特性和胚胎学研究"(30560099)项目资助
关键词
华北驼绒藜
空间格局
半方差函数
主成分分析
ceratoides arborescen
spatial pattern
Semi-Variance function
principal component analysis
