摘要
2009年和2010年对三峡水库支流童庄河回水区和长江干流水体理化和浮游植物进行了同步连续跟踪监测。结果表明,2010年童庄河回水区和长江干流氮、磷含量较2009年有所升高,相同年份童庄河回水区和长江干流氮、磷含量各有高低,但差别不大。2-3月,童庄河回水区拟多甲藻(Peridiniopsis sp.)细胞密度逐步增加并达到高峰,其细胞密度可从2009年第13位、2010年2月26日的第9位,在2010年3月17日迅速上升为第1位,成为第一优势种类,并在2010年2-3月形成水华。拟多甲藻水华最先出现在回水区尾端,随着时间推移,逐步向中下游发展,并形成大面积水华,在维持一段时间后消退。童庄河回水区拟多甲藻密度上游最高,从上游至下游,密度逐渐下降。同期长江干流出现拟多甲藻的次数较少、密度较低,通常在回水区最低密度的30.91%以下。分析认为,2-3月回水区更适合拟多甲藻生长,能否形成水华主要受水文因子的影响。
A consecutive investigation on the physicochemical property and phytoplankton was conducted in the main channel of the Yangtze River and Tongzhuang River branch waterback area from 2009 to 2010.The monitoring results showed that the nitrogen and phosphorus contents in both Yangtze River and Tongzhuang River were higher in 2010 than in 2009,but no significant differences were found between the two rivers in the same year.The cell density of Peridiniopsis sp.in the waterback area of the Tongzhuang River increased rapidly and the Peridiniopsis sp.water bloom occurred in February and March in 2010.The algal water bloom firstly occurred in the tail end of the waterback area,and gradually developed toward the middle and lower reaches and finally formed into a large-scale bloom,and withdrew after a period of time.The algal density was higher in the upper reach of the Tongzhuang River with decreasing trend from the upper to lower reaches.In the same period,the occurrence frequencies and densities of Peridiniopsis sp.was low in the mainstream of the Yangtze River.The cell densities were generally lower than those of 30.91% in the branch waterback area.Our results indicated that the conditions in the branch waterback area were more suitable for the algae growth from February to March.Yet whether the algae water bloom occurs or not is up to hydrological factors.
出处
《水生态学杂志》
北大核心
2012年第4期49-53,共5页
Journal of Hydroecology
基金
湖北省自然科学基金重点项目(2008CDA092)
科技部国际合作重点项目(2008DFA31550)
国家重大水专项项目(2009ZX07528-003)
关键词
三峡水库
童庄河
拟多甲藻
水华
监测
Three Gorges Reservoir
Tongzhuang River
Peridiniopsis sp.
water bloom
monitoring
