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上海市河道水体拟浮丝藻生物量与环境因子的回归分析

王梦梦1,2,3,张玮1,2,3,杨丽1,2,3,徐肖莹1,2,3,王丽卿1,2,3*   

  1. 1农业部鱼类营养与环境生态研究中心, 上海海洋大学, 上海 201306;2水产种质资源发掘与利用教育部重点实验室, 上海海洋大学,上海 201306;3水产科学国家级实验教学示范中心, 上海海洋大学,上海 201306)
  • 出版日期:2018-01-10 发布日期:2018-01-10

Regression analysis betweenPlanktothricoides spp. biomass and environmental factors in urban rivers from Shanghai, China.

WANG Meng-meng1,2,3, ZHANG Wei1,2,3, YANG Li1,2,3, XU Xiao-ying1,2,3, WANG Li-qing1,2,3*   

  1. (1Centre for Research on Environmental Ecology and Fish Nutrient ( CREEFN ) of the Ministry of Agriculture,  Shanghai Ocean University, Shanghai 201306, China; 2Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Shanghai Ocean University, Ministry of Education, Shanghai 201306, China; 3National Demonstration Center for Experimental Fisheries Science Education,  Shanghai Ocean University, Shanghai 201306, China).
  • Online:2018-01-10 Published:2018-01-10

摘要:

拟浮丝藻是一类常见的水华蓝藻,为探究城市河道生境中该类蓝藻与环境因子的关系,本研究采用广义加性模型(GAM)回归分析法对2013—2016年夏季上海地区36条河道的野外调查数据进行了分析。结果表明:夏季拟浮丝藻生物量与水温(25~35 ℃)和pH(6.5~9.5)二者呈显著正相关,而与氮、磷浓度相关性不显著(P>0.05);上海市河道水体中营养盐(总氮浓度平均为2.62 mg·L-1,总磷浓度平均为0.46 mg·L-1)不是拟浮丝藻生长的限制性因素;另外,拟浮丝藻生物量与轮虫、原生动物和小型枝角类生物量总体呈显著正相关,而与桡足类的生物量呈负相关;这可能与食物资源(小型可食性藻类的增加)以及不同类型的浮游动物对于丝状蓝藻的耐受性差异有关。
 

关键词: 高山林线, 气候变化, 开顶式增温, 土壤活性氮, 土壤活性碳

Abstract: Field investigation data in summer from 36 urban rivers in Shanghai  were used to explore the relationship betweenPlanktothricoidesspp., which can form  cyanobacteria bloom, and its environmental factors. The generalized additive model (GAM) results showed that the biomass ofPlanktothricoides spp. significantly increased when the water temperature ranged between 25 and 35 ℃ and the pH values ranged between 6.5 and 9.5. Contrarily, Planktothricoides spp. didn’t show significant correlation with total nitrogen and total phosphorus (P>0.05) when their concentrations ranged from 0.04 to 7.33 mg·L-1 and from 0.04 to 4.10 mg·L-1, respectively. It was indicated that the high concentrations of nutrients in Shanghai rivers were no longer the limitation factors for the growth of Planktothricoides spp. Furthermore, significantly positive correlations were observed between the biomass of rotifer, protozoan and cladocera andPlanktothricoidesspp., while the latter showed a negative correlation with copepod biomass. This correlation pattern between zooplankton andplanktothricoidesspp. may be explained by the abundance of small sized edible algae in the water column and the tolerance capability of different sized zooplankton to filamentous cyanobacteria.

Key words: climate change, open-top camber, soil activated carbon, soil activated nitrogen, alpine treeline