Zhang Yong-Sheng, Zheng Bing-Hui, Jiang Xia, Zheng Hao, Zhong Na, Chen Chun-Xiao
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing 100012, China.
Huan Jing Ke Xue. 2012 Nov;33(11):3787-96.
To support the basic data for forecast of algal blooms, circadian vertical migration experiment was carried out in the Daning River Bay of the Three Gorges Reservoir in July, 2011. The results were as follows: in this period, different algal species were found in the Daning River Bay, including cyanobacteria, green algae, dinoflagellates and diatoms etc; the distribution of algal cells was uneven, 72.5%-76.2% of algal cells aggregated at 0.5-4.0 m water depths from 10:00 AM to 10:00 AM next day, but 7.5%-16.3% of algal cells aggregated at 0-0.5 m. Morisita's indexes (MI) of algal cells were from 1.41 to 1.97 in day time, and from 1.17 to 1.55 at night. Morisita's indexes of chlorophyll a(Chla)were from 1.31 to 1.59 in day time, and from 1.17 to 1.39 at night. The vertical migration also occurred at 0.5-4.0 m water depths. The algal density was not significantly related with the concentrations of nutrient except that of dissolved total phosphorus (DTP) (r = 0.89). The algal density was also influenced by water temperature (WT), pH and specific conductance (SPC), and the correlation coefficients were 0.96, 0.97 and -0.99, respectively.
为获取藻类水华预测的基础数据,于2011年7月在三峡水库大宁河河湾开展了昼夜垂直迁移实验。结果如下:在此期间,大宁河河湾发现了不同藻类,包括蓝藻、绿藻、甲藻和硅藻等;藻类细胞分布不均,从上午10:00至次日上午10:00,72.5%-76.2%的藻类细胞聚集在水深0.5-4.0米处,但7.5%-16.3%的藻类细胞聚集在0-0.5米处。藻类细胞的森下指数(MI)白天为1.41至1.97,夜间为1.17至1.55。叶绿素a(Chla)的森下指数白天为1.31至1.59,夜间为1.17至1.39。垂直迁移也发生在水深0.5-4.0米处。除溶解总磷(DTP)外,藻类密度与营养盐浓度无显著相关性(r = 0.89)。藻类密度还受水温(WT)、pH值和电导率(SPC)影响,相关系数分别为0.96、0.97和-0.99。