摘要
采用地统计学分析方法,研究内蒙古短花针茅草原优势种群短花针茅(Stipa breviflora)种群、无芒隐子草(Cleistogenes songorica)种群、冷蒿(Artemisia frigida)种群、银灰旋花(Convolvulus ammannii)种群在中小尺度不同方向的盖度空间分布的类型及其空间变异。结果表明:各优势种种群在中小尺度均呈聚集分布。相同尺度不同方向、相同方向不同尺度的空间分布格局变化明显,相同尺度种群格局的各向异性比也存在差异。小尺度种群格局的变化主要受放牧和种群的繁殖特性影响,在大尺度不同方向的种群空间格局比较中,地形因素、地貌、土壤异质性等成为影响空间格局的主要原因。
The spatial pattern and its spatial change were analyzed on different scales and in different directions by geographical sta- tistics for dominants of Stipa breviilore, Cleistogenes songorica, Artemisia frigida and Convolvulus ammarmii on Inner Mongolia Stipa brevitlora Steppe. The research results showed that dominants show gathering distribution. The spatial distribution pattern of dominant cover varies obviously in different direction on the same scale and on different scales in the same direction. And the pattern differing of different direction of dominant＇s cover are various on the same scale. Small - scale changes of patterns are effected by grazing and the population breeding characteristics. By comparing different directions spatial pattern of dominants on large - scale, the main factors which affect the spatial patterns are topography and geomorphology and soil heterogeneity.
出处
《内蒙古农业大学学报（自然科学版）》
CAS
北大核心
2009年第1期65-70,共6页
Journal of Inner Mongolia Agricultural University(Natural Science Edition)
基金
内蒙古自治区高等学校科学研究项目(NJ05093)
内蒙古农业大学博士科研启动基金项目(BJ04-22)
