关键词: 水声学, 水库, 鱼类, 大小组成, 资源量

Abstract: Asimple ordination technique based on classification results and matrix multiplication was introduced. It Was used to analyze the grassland data in Hopsten, Northwest Germany and its outcome was compared with that of detrended correspondence analysis(DCA) in this paper. The results suggested that it was a successive and effective ordination method, and was casier in interpretation.

Key words: hydroacoustics, reservoir, fish, size composition,  , biomass.