干旱区典型湖泊湿地主要植物生态种组分析

根据2007年7-9月新疆艾比湖湿地25种主要植被在47个调查样地的存在．缺失数据，应用非度量多维标度（NMDS）方法研究了干旱区典型湖泊湿地内植物群落生态种组的划分，并与系统聚类分析结果做了比较分析。研究显示：艾比湖湿地的主要植物种划分为5个生态种组，各生态种组内的植物种之间具有相似的生境和生态位；NMDS是基于高维数据非线性迭代的降维排序方法，与传统的生态种组分析方法相比较，NMDS充分抽取了植被在样地内非线性集聚分布的信息，因而其种组划分结论更符合实际调查结果，也更为可靠、有效。研究结果从生态种组的视角为艾比湖湿地生态恢复和保护植物多样性提供更具有实践价值的参考依据。

Ecological species groups analysis of main plants in the typical lake wetland of arid area

Based on the presence-absence data of 25 dominant plant species in 47 sampling plots from Ebinur Lake Wetland in Xin- jiang in July-September 2007, the nonmetric multidimensional scale （NMDS） was employed to analyze the ecological species groups of the plant communities in the typical lake wetland of arid area and the results were compared with those obtained by using hierar- chical cluster analysis. The study shows that the main plant species in Ebinur Lake Wetland can be classified into five main ecologi- cal species groups and the habitats and ecological niches are similar within each ecological species groups. Additionally, NMDS is a robust nonlinear ordination method on the basis of Dimension reduction for the high dimensional data and can fully extract the non-linear gathering information in sampling plot. Therefore, NMDS is more objective and effective than the conventional methods in terms of ecological species groups. It has both theoretical and practical values to study the wetland restoration and protection of plant diversity from the view of the ecological species groups.