Zhou Ran, Peng Shi-Tao, Qin Xue-Bo, Shi Hong-Hua, Ding De-Wen
Tianjin Research Institute for Water Transport Engineering, Ministry of Transport, Tianjin 300456, China.
Huan Jing Ke Xue. 2013 Mar;34(3):864-73.
A detailed field survey of hydrological, chemical and biological resources was conducted in the Bohai Bay in spring and summer 2007. The distributions of phytoplankton and their relations to environmental factors were investigated with multivariate analysis techniques. Totally 17 and 23 taxa were identified in spring and summer, respectively. The abundance of phytoplankton in spring was 115 x 10(4) cells x m(-3), which was significantly higher than that in summer (3.1 x 10(4) cells x m(-3)). Characteristics of phytoplankton assemblages in the two seasons were identified using principal component analysis (PCA), while redundancy analysis (RDA) was used to examine the environmental variables that may explain the patterns of variation of the phytoplankton community. Based on PCA results, in the spring, the phytoplankton was mainly distributed in the center and northern water zone, where the nitrate nitrogen concentration was higher. However, in summer, phytoplankton was found distributed in all zones of Bohai Bay, while the dominant species was mainly distributed in the estuary. RDA indicated that the key environmental factors that influenced phytoplankton assemblages in the spring were nitrate nitrogen (NO3(-) -N), nitrite nitrogen (NO2(-) -N) and soluble reactive phosphorus (SRP), while ammonium nitrogen (NH4(+) -N) and water temperature (WT) played key roles in summer.
2007年春夏季对渤海湾的水文、化学和生物资源进行了详细的实地调查。采用多元分析技术研究了浮游植物的分布及其与环境因子的关系。春季和夏季分别鉴定出17种和23种浮游植物类群。春季浮游植物丰度为115×10⁴个细胞·m⁻³，显著高于夏季（3.1×10⁴个细胞·m⁻³）。利用主成分分析（PCA）确定了两个季节浮游植物群落的特征，同时采用冗余分析（RDA）来检验可能解释浮游植物群落变化模式的环境变量。根据PCA结果，春季浮游植物主要分布在硝酸盐氮浓度较高的中部和北部水域。然而，夏季渤海湾各区域均发现有浮游植物分布，而优势种主要分布在河口。RDA表明，春季影响浮游植物群落的关键环境因子是硝酸盐氮（NO₃⁻-N）、亚硝酸盐氮（NO₂⁻-N）和可溶性活性磷（SRP），而夏季铵态氮（NH₄⁺-N）和水温（WT）起关键作用。
