Abstract: The species diversity and distribution of Sarcomastigophora in Linxia section of Daxia River were studied from February 2005 to March 2007. A total of 135 species belonging to 16 orders of 5 classes were recorded, with the dominant of Euglenida and Amoebida. For different sampling sites in the same water period and for different water periods at the same sampling site, the Jaccard similarity index among Sarcomastigophora communities was all lower, suggesting an obvious spatial heterogeneity. Such a character of the community structure of Sarcomastigophora suggested that the water body of Linxia section of Daxia River had been polluted to some extent, and the pollution was heavier in low water period than in plentiful water period.

Key words: Eco-industrial park, Power plant, Emergy, Sustainability