草业学报2012，Vol.21Issue(1)：83-92,10.
内蒙古短花针茅群落数量分类及环境解释
Ecological analysis and classification of Stipa breviflora communities in the Inner Mongolia region: the role of environmental factors
摘要
Abstract
Environmental characteristics, spatial heterogeneity, and biological interactions are key factors that affect ecological communities. We studied how environmental factors and spatial patterns influence the structure of Stipa breviflora communities in the Inner Mongolia region. First, we used the two-way indicator species analysis (TWINSPAN) algorithm to summarize variation in species composition and group 202 study plots. Second, we investigated the effects of three environmental and three spatial factors, together with their interaction, on the structure of S. brevi flora communities by using detrended canonical correspondence analysis (DC-CA). 1) The target plant communities were classified into 16 groups at the fourth level of division by TWINS-PAN; 2) The first two DCCA axes, which corresponded to gradients of temperature and precipitation, respectively, explained most of the variation in community structure (75. 3%). Based on these results different S. brevi flora communities were arranged into an ecological series; 3) When analysed together, 70. 7% of the total variance in S. brevi flora community structure was explained by all environmental factors and 55. 6% by all spatial factors. When these factors were examined separately, only 29. 5% and 11. 4% of the total variance were explained respectively, while 44. 2% was simultaneously explained by the two groups of factors, and 17. 9% was explained by other undetermined factors. Our study contributes to other researchers' findings and strongly supports the conclusion that the degree to which environmental factors control the structure and spatial distribution of plant communities is determined by complexity of the vegetation pattern. The explanatory power of plant community structure by environmental factors decreases with the increase in complexity of vegetation cover.关键词
内蒙古/短花针茅/双向指示种分析法/除趋势典范对应分析/环境解释Key words
Inner Mongolia/ Stipa brevi flora / TWINSPAN/ DCCA/ environmental interpretation分类
农业科技引用本文复制引用
张庆,牛建明,BUYANTUYEV Alexander,丁勇,康萨如拉,王凤兰,张艳楠,杨艳,韩砚君..内蒙古短花针茅群落数量分类及环境解释[J].草业学报,2012,21(1):83-92,10.基金项目
国家科技支撑计划课题(2011BAC07B01),国家自然科学基金(30760158,31060320)及高等学校博士学科点专项科研基金(20070126004)资助. （2011BAC07B01）
