澎溪河春夏季节藻类群落结构与水质状况研究

Study on alga community structure and water quality situation in Pengxi river in seasons of spring and summer

三峡水库自建成运行以来,澎溪河流域富营养化问题日益突出。本研究在2014年4-7月易发生水华的春夏时期进行,对澎溪河流域藻类群落结构特征及水质状况进行跟踪分析。结果表明:水华发生时,水环境特征发生显著变化,水质状况恶化,藻细胞密度急剧升高,藻细胞密度最高达到1176×104cells/L,水华藻种为角甲藻和铜绿微囊藻,藻种种类单一,藻类多样性显著变低。空间分布上,藻细胞密度从上游向下游呈增高趋势。相关性分析表明:藻细胞密度与TN、TP呈显著正相关,藻类大量增殖爆发与水体营养盐浓度升高具有重要联系,澎溪河流域水华问题的防治有赖于对流域内营养盐排放的有效治理。

Since the Three Gorges reservoir had been constructed and operated ,the eutrophication prob-lem in the Pengxi river has become increasingly prominent .The research was carried out in Spring and summer seasons when algal bloom is easy to take place from April to July ,2014 .The paper analyzed the structure feature of algal bloom diversity and situation of water quality in Pengxi river basin .The result showed that when alga bloom took place ,the feature of water environment changed evidently and the situa-tion of water quality is more serious .The density of algal cell is quickly increased and can got to 1176 × 104 cells/L.The species of algae is water bloom algae and pseudomonas aeruginosa .The algae species are single and the diversity of algae is significantly lower .The density of algal cell in downstream was much higher than that in upstream on space distribution .The relative analysis indicated that the density of algal cell is positively correlated with TN and TP .Algae proliferation outbreak has an important link with the in-crease of water nutrient concentration .The control of algae bloom in Pengxi River basin depends on effec-tive governance of watershed nutrient salt emission .