| 非度量多维测度及其在群落分类中的应用 |
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| 引用本文： | 余世孝.非度量多维测度及其在群落分类中的应用[J].植物生态学报,1995,19(2):128-136. |
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| 作者姓名： | 余世孝 |
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| 作者单位： | 中山大学生物学系 |
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| 摘 要： | 排序与聚类分析法是近代最为常用的植被数量分析方法。原理上，排序较之于聚类法，一般具有较为严格的数学基础。在植被研究的应用方面，排序比聚类法能更好反映植被的连续性。同时，在反映植被分类结果上，排序图不仅象聚类树形图一样，使全部实体之间的划分关系得以反映，而且两两实体间的关系可以通过排序图上彼此间的距离比较而得以较好的反映。然而常规的排序方法主要适用于具有线性结构的数据分析，在2—3维排序图上常难以充分反映这些实体的生态学关系，造成大量生态学数据信息的损失。非度量多维测度(Non-metric multidimensional scaling)是近期发展起来的适用于非线性数据结构分析的一种复杂的迭代排序方法。它的基本思想是通过排序，n个实体在尽可能低维(t
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| 关 键 词： | 非度量多维测度 排序 群落分类 热带森林 |
THE APPLICATION OF NON-METRIC MULTIDIMENSIONAL SCALING IN COMMUNITY CLASSIFICATION |
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| Yu Shi-xiao.THE APPLICATION OF NON-METRIC MULTIDIMENSIONAL SCALING IN COMMUNITY CLASSIFICATION[J].Acta Phytoecologica Sinica,1995,19(2):128-136. |
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| Authors: | Yu Shi-xiao |
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| Abstract: | Ordination is one of the most popular multivariate analysis methods used in vegetation research. However, most of the commonly used techniques involved in this aspect are concerned with linear data set that is difficult to find in the ecological world. In this paper, non-metric multidimensional scaling,a non-linear ordination technique put forward in Shepard and Kruskal, is introduced and its algorithm is programmed in the C++ computer language as program NMMDS, and it is included in the computer software Gingko V1.O used for structural analysis of vegetation. An example with the classification of tropical montane forest in Bawangling Nature Reserve, Hainan island, is presented. Also other multivariate analysis methods, such as principal components analysis, cluster analysis, are also used for comparison, The result shows that non-metric multidimensional scaling is suitable for higher species richness community classification, and much better than principal components analysis. With this, two sub-vegetation types in Bawangling montane forest have been classified. The tropical montane rain forest is represented by Dacrydium pierrei +Syzygium araiocladum community, while the tropical montane evergreen forest is represented by Sycopsis tutcheri +Syzygium araiocladum community. Also five associations among them are recognized. |
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| Keywords: | Non-metric multidimensional scaling Ordination Commu-nity classification Tropical forest Hainan Island |
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