北京师范大学学报（自然科学版）2016，Vol.52Issue(1)：83-90,8.DOI:10.16360/j.cnki.jbnuns.2016.01.017
内蒙古草原植物群落分布格局及其主导环境因子解释
Distribution pattern of main steppe communities in Inner Mongolia Region and environmental interpretation
摘要
Abstract
Various temperate steppe communities are present in the Inner Mongolian Plateau region from northeast towards southwest in Northern China,largely owing to regional heterogeneous environment with sharp water and thermal gradients as well as spatially-differentiated soil types.To study influence of those regional and local environmental factors on distribution and differentiation pattern of steppe vegetation, relationships between community features and environmental factors were analyzed.Vegetation data were sampled from 273 plots along a 1 500 km belt transect,climatic and soil data were obtained from field survey or collected with GIS tools.TWINSPAN (two-way indicator species analysis)was used to classify vegetation, DCA (detrended correspondence analysis ) was used to examine and validate differentiation among those vegetation formations.Classification by TWINSPAN,MRT (multivariate regression trees)was used to select key environmental factors greatly influencing distribution and composition of communities.CCA (canonical correspondence analysis)was used to interpret the most prominent environmental factors dominating spatial differentiation of vegetation types as well as their species composition features.Those 273 plots surveyed along the belt transect could be clearly classified into 8 vegetation formations belonging to 3 vegetation subtypes, each could characterize and stand for a special kind of grassland habitats.DCA ordination implied some relationships between steppe communities and environment gradients. Moisture gradient (represented by precipitation regime)from southwest up to northeast,partly along with thermal gradient (represented by the temperature regime)in the same direction,seemed to function as the most prominent factor influencing distribution and differentiation of regional steppe communities.Distribution pattern of 23 dominant species revealed by CCA ordination clearly demonstrated chief environmental factors dominating differentiation of steppe communities.DCA ordination,MRT and CCA ordination all reflected that climatic factors played the most important role in distribution and differentiation of vegetation types in the study area.Precipitation of the wettest month,precipitation of the warmest quarter and precipitation of the coldest quarter were among dominant ones.The combined use of MRT and CCA was effective,which could mine much deeper among environmental factors to provide more comprehensive and detailed environmental interpretation on vegetation distribution pattern.关键词
内蒙古草原/群落分类与排序/多元回归树/典范对应分析/植被-环境关系Key words
steppe vegetation in Inner Mongolia/community classification and ordination/multivariate regression trees (MRT)/canonical correspondence analysis (CCA)/vegetation-environment relationship分类
农业科技引用本文复制引用
王宇航,赵鸣飞,康慕谊..内蒙古草原植物群落分布格局及其主导环境因子解释[J].北京师范大学学报（自然科学版）,2016,52(1):83-90,8.基金项目
国家自然科学基金资助项目(41271059) （41271059）
科技部科技基础性工作专项基金资助项目(2011FY110300) （2011FY110300）
