柳溪湖生态修复前后浮游动物群落结构变化

Variation of Zooplankton Community Structure before and after Ecological Restoration in Liuxi Lake

摘要: 为探究生态修复对浮游动物群落结构及水质的影响，分别于2015年和2020年的7月与10月对宁夏柳溪湖(东经106˚8'20ʺ~106˚9'32ʺ，北纬37˚58'58ʺ~38˚0'5ʺ)进行采样调查研究。根据柳溪湖的湖泊状况，共设置了6个采样点。生态修复后柳溪湖浮游动物种类和数量均明显增加；浮游动物丰度与生物量均普遍升高；优势种数量增多，优势度指数相比于生态修复前升高。夏季(7月)浮游动物丰度和生物量均高于秋季(10月)。生态修复后，Shannon-Wiener多样性指数(H')7月上升，10月下降；Pielou均匀度指数(J)则出现相反现象，为7月下降、10月上升。这表明，生态修复后的柳溪湖环境可能更适合浮游动物生存，但在生态修复中柳溪湖浮游动物群落结构并不稳定，可能需要较长时间的生物演替才可使得浮游动物群落趋于更稳定状态。

Abstract: To investigate the impact of ecological restoration on the community structure and water quality of zooplankton, experiments were conducted in July and October of 2015 and 2020 on Liuxi Lake in Ningxia (East longitude 106˚8'20ʺ~106˚9'32ʺ, North Latitude 37˚58'58ʺ~38˚0'5ʺ) Conduct sampling survey research. According to the lake conditions of Liuxi Lake, a total of 6 sampling points were set up. After ecological restoration, the species and quantity of zooplankton in Liuxi Lake have significantly increased; the abundance and biomass of zooplankton generally increase; the number of dominant species increased, and the dominance index increased compared with that before ecological restoration. The abundance and biomass of zooplankton in summer (July) are higher than in autumn (October). After ecological restoration, the Shannon Wiener diversity index (H') increased in July and decreased in October; the Pielou evenness index (J) showed the opposite phenomenon, with a decrease in July and an increase in October. This indicates that the environ-ment of Liuxi Lake after ecological restoration may be more suitable for the survival of zooplankton, but the community structure of zooplankton in Liuxi Lake is not stable during ecological res-toration, and it may take a long time for biological succession to make the zooplankton community tend to a more stable state.