Xu Zhi, Chen Xiao-Hua, Shen Gen-Xiang, Zhu Ying, Qian Xiao-Yong, Zhang Xin-Liang, Zhang Wei, Hu Shuang-Qing, Bai Yu-Jie
School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.
Shanghai Academy of Environmental Sciences, Shanghai 200233, China.
Huan Jing Ke Xue. 2020 Aug 8;41(8):3621-3628. doi: 10.13227/j.hjkx.202001186.
In order to explore the spatial and temporal characteristics of the phytoplankton community structure and its influencing factors in Shanghai rivers, the water quality and phytoplankton community structure at 44 river channel sites in a central urban area, new town area, and rural area in Shanghai were investigated from September to October 2018 (autumn) and July to August 2019 (summer). The results showed that:① Chlorophyta was the dominant phyla during the autumn and summer, and was followed by Cyanobacteria and Bacillariophyta. Cyanobacteria dominated the phytoplankton community in terms of density. The number of species and density of phytoplankton were 24% and 2.77 times higher, respectively, than those during the summer and autumn. The dominance of sp. was obvious during the autumn (=0.16), but there was no absolute dominant species during the summer. ② The difference in the number of phytoplankton species among the three regions was not significant, and the density of the total phytoplankton and cyanobacteria species showed a similar spatial pattern:rural area > new town area > central urban area. Additionally, no significant difference was observed in the total phytoplankton and Cyanobacteria density among the three regions during the autumn (>0.05), whereas it was 1.82 and 1.93 times higher, respectively, in the rural area in comparison to the central urban area during the summer (<0.05). Montecarlo test results revealed that the main factors affecting the phytoplankton community structure during the autumn were secchi disk transparency (SD), total phosphorus (TP), total nitrogen (TN), and turbidimetry (Turb), whereas these were TN, Turb, SD, and pH during the summer. ③ The results of a redundancy analysis (RDA) indicated that during the autumn, the phytoplankton in the rivers of the new town area were mainly affected by Turb, TN, and TP, while the rural rivers were mainly affected by SD. During the summer, the phytoplankton in the rivers of the new town and rural areas were mainly affected by TN and Turb. The influencing factors in the central urban area were complex.
为探究上海河流浮游植物群落结构的时空特征及其影响因素，于2018年9月至10月（秋季）和2019年7月至8月（夏季）对上海中心城区、新城区和农村地区44个河道点位的水质及浮游植物群落结构进行了调查。结果表明：① 绿藻门是夏秋季节的优势门类，其次是蓝藻门和硅藻门。蓝藻门在浮游植物群落密度方面占主导。浮游植物的种类数和密度分别比夏秋季高24%和2.77倍。秋季 种的优势度明显（=0.16），但夏季没有绝对优势种。② 三个区域浮游植物种类数差异不显著，浮游植物总密度和蓝藻门种类密度呈现相似的空间格局：农村地区＞新城区＞中心城区。此外，秋季三个区域浮游植物总密度和蓝藻门密度差异不显著（＞0.05），而夏季农村地区分别比中心城区高1.82倍和1.93倍（＜0.05）。蒙特卡洛检验结果显示，秋季影响浮游植物群落结构的主要因素是透明度（SD）、总磷（TP）、总氮（TN）和浊度（Turb），而夏季是TN、Turb、SD和pH。③ 冗余分析（RDA）结果表明，秋季新城区河流浮游植物主要受Turb、TN和TP影响，农村河流主要受SD影响。夏季新城区和农村地区河流浮游植物主要受TN和Turb影响。中心城区的影响因素较为复杂。
