黄河水系鱼类分布的模糊聚类分析

应用模糊聚类法对黄河水系鱼类分布进行研究，结果表明，当λ＝０．５２时，黄河水系鱼类分布可分为８类：黄河上游干流、星宿海、黑河、鄂陵湖为一类；黄河中游干流、渭河为一类；乌梁素海、哈素海、陕北高原河流为一类；冯家山水库、陆浑水库为一类；黄河下游干流、东平湖为一类；洮河、伊洛河、河口干流各为一类。

Fuzzy Cluster Analysis on the Distribution of the Fishesin Huanghe River System

Fuzzy cluster analysis was made to study the distribution of the fishes in Huanghe River system. The results showed that the distribution may be divided into eight types when equaled 0.52.The upper reaches of Huanghe River,the Xingsuhai Lake,the Heihe River,the Eling Lake were clustered into a type;the middle reaches of Huanghe River were clustered into a type; the Wuliangsuhai Lake,the Hasuhai Lake, the brooks of Shanbei Plateau were clustered into a type; the Fengjiashan Reservoir, the Luhun Reservoir were clustered into a type;the lower reaches of Huanghe River, the Dongping Lake were clustered into a type,while the Zhaohe River,the Yiluohe River and the Huanghe River mouth each formed a single type.