宁夏哺乳动物地理分布的聚类分析

Cluster analysis on the geographical distribution of mammals in Ningxia

用组平均法对宁夏哺乳动物地理分布区进行聚类，６ 个动物地理州在距离系数为０．３８７０ 时聚为４ 个类群，在距离系数为０．５１４９ 水平聚合为２ 个类群组．聚类结果与中国动物地理区划中宁夏跨２ 个动物地理区及宁南、宁中北分属华北区黄土高原亚区和蒙新区东部草原亚区的划分相吻合，而与宁夏西北边缘的贺兰山地和腾格里沙漠东南缘同属蒙新区西部荒漠亚区的划分不吻合．文章对聚类结果作了分析，比较了应用不同匹配系数公式对动物地理分布聚类结果的影响．

The geographical distributional districts of mammals in Ningxia is clustered by using group average clustering method.The 6 zoogeographical prefectures can be clustered to 4 groups at the distance coefficient 0.387?0,and 2 groups at 0.514?9.The cluster results agree with the division that Ningxia spans 2 zoogeographical regions,and that South Ningxia belongs to Loess Plateau Subregion of North China Region,and that Middle and North Ningxia belongs to Eastern Steppe Subregion of Neimenggu Xinjiang region.But the cluser results don't agree with the division that the Helan Mountain area and the south east verge of Tenggeli Desert,which are situated at the north west verge of Ningxia,belong to Western Desert Subregion of Neimenggu Xinjiang Region.The effection of using different formulas of matching coefficent on cluster result of zoogeographical distribution is discussed.