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Abstract：
Phytoplankton community characterized by strong vitality response to environmental change in freshwater ecosystems. This study aims to evaluate the effectiveness of using phytoplankton diversity as a water quality indicator in wetlands, and find out the main environmental variables affecting the distribution of phytoplankton. From 2020 to 2021, we examined phytoplankton assemblages and water environmental variables in spring, summer, and autumn at eight sampling sites from Hulanhe Wetland, Northeast (NE) China. The results showed that Bacillariophyta was the dominant species. Phytoplankton composition and abundance differed among sampling sites in each season; the abundance in summer (613.71 × 104 ind. L-1) was higher than that in autumn and spring. The water quality assessment of the trophic state index (TSI) based on the four physicochemical indicators was compared with phytoplankton diversity indices, which indicated that the phytoplankton community was stable, and these two indices were significantly lower in summer than in spring and autumn. According to redundancy analysis (RDA), total phosphorus (TP) and nitrogen (TN) were the main environmental variables affecting the distribution of phytoplankton. Temperature and dissolved oxygen (DO) changes also played a role, and their impact on the community was discussed. This work can provide relevant scientific references on the usefulness of phytoplankton diversity structure in assessing water quality in cold regions, in which the succession can be significantly affected by nutrients and temperatures.
摘要：
淡水生态系统中浮游植物群落对环境变化具有强烈的活力响应。这项研究旨在评估在湿地中使用浮游植物多样性作为水质指标的有效性。并找出影响浮游植物分布的主要环境变量。从2020年到2021年，我们检查了春季的浮游植物组合和水环境变量，夏天,秋天在呼兰河湿地的八个采样点，东北（NE）中国。结果表明，芽孢杆菌是优势种。每个季节的浮游植物组成和丰度在采样点之间有所不同；夏季的丰度（613.71×104ind。L-1)高于秋季和春季。将基于四个理化指标的营养状态指数（TSI）的水质评价与浮游植物多样性指数进行了比较，这表明浮游植物群落是稳定的，夏季这两个指数明显低于春季和秋季。根据冗余分析(RDA)，总磷（TP）和氮（TN）是影响浮游植物分布的主要环境变量。温度和溶解氧（DO）的变化也起了作用，讨论了它们对社区的影响。这项工作可以为浮游植物多样性结构在评估寒冷地区水质方面的有用性提供相关的科学参考。在这种情况下，营养和温度会显著影响演替。
