关键词: 星星海, 总有机碳, 总氮, 总磷, 相关性

Abstract: [Objective] The aim of the study was to study the stoichiometry characteristics of carbon, nitrogen and phosphorus in Stars Sea of Sanjiang source and to provide the basis of revealing the potential eutrophication in Longbao Lake wetland. [Method] Three sampling points in Stars Sea were set. Water samples were collected and total organic carbon(TOC), nitrogen(TN) and phosphorus(TP) were analyzed. According to "Surface Water Quality Standards"(GB3838-2002), the overproof rate and times of ultra standard were used to evaluate water quality. The correlations among TOC, TP and TN were analyzed. [Result] The contents of TN, NH₄⁺-N, NO₃^--N, TP and TOC were 0.326 mg/L, 0.100 mg/L, 0.109 mg/L, 0.014 mg/L and 0.406 mg/L, respectively, in the Stars Sea water. According to "Surface Water Quality Standards"(GB3838-2002), the contents of TOC, TP and TN exceeded Ⅰ water quality standard and the ultra standard of TN and TP were 0.63 and 0.4, respectively. The overproof rate of TN and TP were 66.7% and 33.3% respectively. Correlation analysis showed that the correlation coefficients were R₁²=0.930 5 between TOC and TN and R₂²=0.693 2 between TN and TP, indicated that the relevance of change trend between carbon and nitrogen was strong, while the relevance was slight between nitrogen and phosphorus. The source of TN and TP in water body was different. C/N was 1.263 and N/P was 23.28, indicating that the sources of organic matter were single and phosphorus was a limiting factor for the potential eutrophication of Stars Sea. [Conclusion] The content of TP and TN exceeded Ⅰ water quality standard of "Surface Water Quality Standards" and reached Ⅱ water quality standard. The water body of Stars Sea has not reached the eutrophication state.

Key words: Stars Sea, total organic carbon, total nitrogen, total phosphor, correlation