摘要
为研究黄河调水调沙对邻近海域浮游植物群落的影响,2013年7月在黄河第16次调水调沙事件后,开展了水文、化学与生物综合调查。研究结果表明,黄河口邻近海域温度、营养盐浓度整体呈现由河口向离岸区域逐渐递减的分布趋势,盐度呈现由河口向离岸区域逐渐递增的分布趋势,显示了黄河水输入的影响程度。叶绿素a与营养盐浓度在空间分布上呈现出较好的对应关系,在黄河口偏渤海湾侧明显高于偏莱州湾侧,且近河口区明显高于离岸区。营养盐结构分析表明,黄河口邻近海域普遍存在磷酸盐(DIP)的绝对和相对限制;但黄河水沙输入在局部站位缓解了硅(DSi)限制。浮游植物群落结构的空间变化显著受到盐度的影响,在受黄河水输入影响显著的C、D、E断面,蓝藻与绿藻的生物量比例明显增高;影响相对较弱的断面则以硅藻、甲藻为主。浮游植物群落结构与环境因子的主成分分析结果表明,DSi、DIP和盐度是影响该海域浮游植物空间变化的关键环境因子。甲藻、蓝藻与绿藻群落受盐度变化的影响程度明显大于硅藻群落;但甲藻群落对营养盐结构的敏感性低于硅藻、蓝藻和绿藻群落。
An ecological survey was carried out in July 2013 in the Yellow River adjacent sea after the 16 th watersediment regulation,with an aim of understanding the response of phytoplankton assemblages to changed environment.The result showed that temperature and nutrient concentrations decreased gradually from the mouth of river to offshore waters,corresponding to the increased freshwater loading,and salinity intreased gradually from the mouth of river to offshore waters.Nutrient concentrations at the sites near to the side of Bohai Bay displayed higher values than the Laizhou Bay.The analysis on nutrient structure indicated that DIP was absolute and relative limitation,while DSi limitation only appeared in a few sites.100 species of phytoplankton in 60 genera of the five classes were identified from the samples,and major phytoplankton components were diatoms and dinoflagellates.In addition,a few brackish species in Cyanophyceae,Chrysophyceae,and Chlorophyceae were also identified from the river mouth,indicating the impact of salinity.Chlorophyll aconcentrations and nutrient concentrations presented a significantly spatial distribution from the river mouth to offshore waters,with higher values at the sites near to the side of the Bohai Bay than the Laizhou Bay.Phytoplankton assemblages were in response to the variations of spatial environmental factors.The biomass proportions of Cyanophyceae and Chlorophyceae increased distinctly in the transections of C,D and E,indicating a strong influence of the diluted water,while diatoms and dinoflagellates in other transections with less impact from the diluted water.The results of Principal Components Analysis between phytoplankton assemblages and environmental factors indicated that DSi,DIP and salinity were key factors related to the spatial variation of phytoplankton assemblages.
出处
《海洋学报》
CAS
CSCD
北大核心
2015年第4期62-75,共14页
基金
中国科学院战略先导研究项目(XDA11020405)
中国科学院重点部署项目(KZZD-EW-14)
河北省科学院科技计划项目(13128)
中国科学院院地合作项目--"河北省海岸带受损生态系统评估及修复技术研究"
关键词
黄河口
浮游植物
调水调沙
盐度
营养盐
Yellow River mouth
phytoplankton
water-sediment regulation
salinity
nutrients
