Cao Cheng-jin, Zheng Bing-hui, Zhang Jia-lei, Huang Min-sheng, Chen Zhen-lou
School of Resource and Environmental Sciences, East China Normal University, Shanghai 200062, China.
Huan Jing Ke Xue. 2009 Dec;30(12):3471-80.
According to the survey conducted from winter and spring algal blooms, the changes of water quality and characteristics of Daning River of Three Gorges Reservoir (TGR) were studied. The results suggested that during the period of winter algal blooms centered on Tangjia bay in Daning river, chlorophyll a (Chl-a) had a wide range (the rates of (Chl-a)max and (Chl-a)min is 260). The contents of total nitrogen (TN), total phosphorus (TP) and potassium permanganate index were at very high levels because of bioaccumulation from algal blooms, but the values of dissolved oxygen (DO) and pH were very low. During winter algal blooms fastigium poor algae were observed accounting for 2 phylum 4 species, dominant species are Microcystis aeruginosa and Microcystis flos-aquae, the maximum value of algal density was 3.15 x 10(7) cells/L, and the correlation weighted nutrition state index was 80, which indicated water body was at high eutrophication level. However the spring algal blooms belonged to whole watershed outbreak, the values of Chl-a, TN, TP and potassium permanganate index became all markedly high with outbreak of algal blooms. There were 5 phylum 44 species algae being observed during spring algal blooms fastigium, different sections observed different dominant species and algal density values. The correlation weighted nutrition state index showed water of Dongping bar and Baishui River sections was at slight eutrophication level. During winter algal blooms there were significantly positive correlations between Chl-a and TN, TP, potassium permanganate index, water temperature, between pH and SD. Significantly negative correlations were observed between Chl-a and DO, SD, between pH and TN, TP, potassium permanganate index. In spring algal blooms significantly positive correlations were observed between Chi-a and TP, potassium permanganate index, DO, pH, between pH and Chla, TP, potassium permanganate index, DO, air temperature. Significantly negative correlations were observed between Chl-a and SD, between pH and SD.
通过对三峡水库大宁河冬春季水华的调查，研究了大宁河水环境质量变化及特征。结果表明，以大宁河唐家河湾为中心的冬季水华期间，叶绿素a（Chl-a）含量变化幅度大（Chl-a最大值与最小值之比为260），总氮（TN）、总磷（TP）和高锰酸钾指数因水华生物富集作用处于很高水平，溶解氧（DO）和pH值则很低。冬季水华高峰期劣类藻有2门4种，优势种为铜绿微囊藻和水华微囊藻，藻密度最大值为3.15×10⁷个/L，综合营养状态指数为80，水体处于高度富营养化水平。春季水华属全流域爆发，随着水华爆发，Chl-a、TN、TP和高锰酸钾指数均显著升高。春季水华高峰期藻类有5门44种，不同断面优势种和藻密度值不同，东坪坝和白水河断面综合营养状态指数显示水体处于轻度富营养化水平。冬季水华期间，Chl-a与TN、TP、高锰酸钾指数、水温呈显著正相关，pH与SD呈显著正相关；Chl-a与DO、SD呈显著负相关，pH与TN、TP、高锰酸钾指数呈显著负相关。春季水华期间，Chl-a与TP、高锰酸钾指数、DO、pH呈显著正相关，pH与Chl-a、TP、高锰酸钾指数、DO、气温呈显著正相关；Chl-a与SD呈显著负相关，pH与SD呈显著负相关。
