关键词: 叶绿素a, 藻密度, 野外监测, 相关性分析, 南水北调中线

Abstract: The Chlorophyll-a concentration and Algal density can represent biomass of algal. In order to study the correlation between Chlorophyll-a concentration and Algal density in the main canal of Middle Route Project of South-to-North Water Diversion, the monitoring cross-sections were set in the main canal (dynamic condition) and stilling pool (static condition) beside the canal. The variation condition and correlation of Chlorophyll-a and Algal density were studied according to the monitored data. The results showed that in dynamic condition, the variation tendencies of Chlorophyll-a concentration and Algal density showed significant correlation, correlation coefficients were 0.88~0.90; Chlorophyll-a and Algal in water containing with single dominant specie had significant positive correlation,r>0.95; the change of dominant algal resulted in the decrease of correlation between Chlorophyll-a concentration and algal density; when dynamic conditions changed to static conditions, the changing spatial and hydrological factors influenced the correlation between Chlorophyll-a concentration and Algal density. The study results will help the relative departments to understand the water quality variation of diverted water by Middle Route Project of South-to-North Water Diversion and supply better service for water users along the route.

Key words: Chlorophyll-a, algal density, field monitoring, correlation analysis, Middle Route of South-to North Water Diversion Project