【摘要】 鄂尔多斯高原地处暖温性草原与荒漠的过渡地段,植被地带分异规律明显。本文在统计分析气候和植物群落数据的基础上,讨论了地带性植被、沙地植被和低湿地植被与生态因子的相互关系,并使之数量化。分析过程包括:(1)运用相互平均排序,将植物群落的空间分布概括到排序的两个主要向量上;(2)主要气候因子与经度、纬度、海拔的相关和逐步回归分析,获得任一样方的气候指标;(3)通过相关和逐步回归分析,描述排序得分与主要生态因子的相关性,从而数量表达植被分布与环境的关系。结果表明:年平均降水量和≥10℃的积温是影响高原植被分布的主导生态因子。低湿地植被深受大气候的影响,土壤全盐量为主导因子。更多还原

【Abstract】 The ordos plateau, where natural conditions are more complicated and vegetation zonalities are clear,is the transitional region from warm temperature steppe to desert. Relations between ecological factors and zonal vegetation, sandland vegetation, and lowland vegetation were discussed as well as these relations were expressed quantitatively in the paper by means of statistically analysing data of environments and of plant communities.The principal analysis contained three steps, 1. to summarize the spatial distribution of vegetation in two main fectrs of RA, 2. to form equations between ecological factors and longitude, latitude, and altitude by the correlation analysis and the stepwise regression analysis in order to gain ecological parameters of each sample, and 3. to describe quantitatively correlations of ordination scores with ecological factors and with vegetation distributions. Results were that the annual mean precipitation and the accumulated temperature (≥10℃) are key factors which affect vegetation distributions strongly, and that the total salt content of soil is the key factor controlling the distribution of lowland plant communities, even though macro climate is very important too.更多还原