嘉兴南湖不同湖区浮游动植物群落结构特征与环境因子关系

为了解不同区域生态修复后环境因子对浮游动植物群落分布的影响，于2021年1月（竣工后）对南湖A、 B、 C、 D和S区的环境因子及浮游动植物开展调查.结果表明，生态修复区较未修复区水体总氮（TN）、溶解性总氮（DTN）、氨氮（NH⁺₄-N）、硝氮（NO^-₃-N）、总磷（TP）和溶解性总磷（DTP）浓度显著降低，溶解氧（DO）显著增高（P<0.05）.研究区浮游植物种类以绿藻和硅藻为主，浮游动物种类以原生动物和轮虫为主.修复区浮游植物生物量较未修复区低，浮游植物与浮游动物物种数升高.聚类与主坐标分析显示修复区浮游动植物群落差异显著（P<0.05）,其中A区和B区游动植物结构较为相似.冗余分析（RDA）结果显示，DO、 NO^-₃-N、 pH和水温（WT）是影响浮游植物群落分布的主要环境因子；DO、 NO^-₃-N、 NH⁺₄-N和TP是驱动浮游动物群落分布的主要环...

Structural Characteristics of Zooplankton and Phytoplankton Communities and Its Relationship with Environmental Factors in Different Regions of Nanhu Lake in Jiaxing City

Nanhu Lake is a red tourist attraction in Jiaxing city and the birthplace of the "Red Boat Spirit."To identify the influence of environmental factors on the distribution of plankton communities after ecological restoration in different regions, the environmental factors and plankton community in areas A, B, C, D, and S of Nanhu Lake were investigated in January 2021 after the completion of the ecological restoration projects. The concentrations of total nitrogen(TN), dissolved total nitrogen (DTN), ammonia nitrogen (NH₄⁺-N), nitrate nitrogen (NO₃^--N), total phosphorus (TP), and dissolved total phosphorus (DTP) in the ecological restoration areas were significantly lower, and the content of dissolved oxygen (DO) was significantly higher (P<0.05) than those in the non-restoration area. The main phytoplankton species in the study area belonged to Cyanophyta and Bacillariophyta, and the main zooplankton species were protozoans and rotifers. The phytoplankton biomass in the restored area was lower than that in the unrestored area, and the number of phytoplankton and zooplankton species increased. Clustering and principal coordinate analysis results showed significant differences in plankton communities among the restoration areas (P<0.05), and plankton structures in regions A and B were similar. Redundancy analysis (RDA) showed that the main environmental factors affecting the distribution of phytoplankton communities were DO, NO₃^--N, pH, and water temperature (WT). The main driving factors of zooplankton community distribution were DO, NO₃^--N, NH₄⁺-N, and TP. The results clarified the phytoplankton community characteristics and environmental correlation in different regions of Nanhu Lake, which can provide data support and reference for water ecological restoration of the lake.