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摘要
To evaluate the eutrophic state of Xiliu Lake (a water source for Zhengzhou city) and establish prediction system to monitor and predict the eutrophic condition of this water resource. Environmental factors including water temperature (WT), secchi depth (SD), water depth (WD), chemical oxygen demand (CODMn), total nitrogen (TN), total phosphorus (TP), chlorophyll-a (Chla), algae cell density (ACD) and cyanophyta cell density (CCD) were measured continuously in two sampling sites that were selected in Xiliu Lake. Trophic level index (Sigma) (TLI(Sigma)), linear correlation and stepwise multiple regression with a significant-value cut-off of alpha=0.05 were used to analyze the data. The result showed that the TLI(Sigma) of Xiliu Lake increased with seasonal changes. Three regression equations of standardized Chla, standardized ACD and standardized CCD were obtained respectively. Tests on these regression equations showed that there was a good correlation between practical value and predictive value of standardized Chla. The correlations for standardized ACD and CCD were even better. In a conclusion, the nutritive condition of Xiliu Lake was eutrophic. A prediction system was established for monitoring the eutrophic condition of surface water through using the three regression equations of standardized Chla, standardized ACD and standardized CCD, which can be used to predict the trend of Chla in Xiliu Lake within a certain range. [Huizhen Zhang, Hongxiang Guo, Xiaohui Liu, Xuemin Cheng, Liuxin Cui. Assessment and Prediction on the Eutrophic State of a Drinking Water Source. Life Science Journal. 2010; 8(1):86-92] (ISSN: 1097-8135). http://www.lifesciencesite.com.
