极端降雨事件对亚热带富营养化湖泊浮游植物群落的影响:中观实验

Yefei Zhang, Tao Li, Lu Zhang, Qin Hu, Zhangyong Liu, Jianqiang Zhu, Yi Chai, Jun R. Yang
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摘要

受全球气候变化的影响,极端降雨事件增多,导致水土输入量波动,对水生生物群落产生了重大影响。长湖是湖北省第三大淡水湖,在长江中游水产种质资源库中发挥着重要作用。近年来,长湖经历了一系列极端降雨事件。为应对近期的极端降雨事件,研究人员开展了一项为期 42 天的中观宇宙实验,以了解陆源输入对长湖浮游植物各方面的影响,如物种组成、丰度、生物量、多样性、群落更替率、资源利用效率和稳定性等。实验采用了不同的增殖处理,包括对照组(CK,使用湖水)、低增殖投入(LT)、中增殖投入(MT)和高增殖投入(HT)。结果表明,浮游植物的组成发生了明显变化,从 CK 处理中的叶绿藻和蓝藻共存状态转变为其他增生处理中的蓝藻为主状态。此外,源性投入增加了浮游植物的丰度、群落周转率、多样性和抗性。与 CK 处理相比,LT、MT 和 HT 处理的浮游植物多样性指数分别增加了 82.61%、73.83% 和 70.41%。然而,浮游植物丰度在 LT、MT 和 HT 处理中分别下降了 6.99%、15.55% 和 14.76%。此外,与 CK 处理相比,LT、MT 和 HT 处理的资源利用效率分别降低了 1.94%、5.16% 和 14.19%。这些研究结果为监测和管理长湖水生态提供了宝贵的见解,为实施有效的管理策略提供了科学依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of extreme rainfall events on phytoplankton community in a subtropical eutrophic lake: a mesocosm experiment
The impact of global climate change has led to an increase in extreme rainfall events, causing fluctuations in terrigenic inputs that significantly affect aquatic communities. Lake Changhu, the third-largest freshwater lake in Hubei Province, plays a crucial role as a reservoir of aquatic germplasm resources in the middle reaches of the Yangtze River. In recent years, the lake has experienced a series of extreme rainfall events. In response to recent extreme rainfall events, a 42-day mesocosm experiment was conducted to understand the effect of terrigenic inputs on various aspects of phytoplankton in Lake Changhu, such as species composition, abundance, biomass, diversity, community turnover rates, resource use efficiency, and stability. The experiment involved the application of different terrigenic treatments, including a control group (CK, using lake water), low terrigenic input (LT), medium terrigenic input (MT), and high terrigenic input (HT). The results showed a noticeable shift in phytoplankton composition from a co-dominated state of Chlorophyta and Cyanobacteria in the CK treatment to a Cyanobacteria-dominated state in the other terrigenic treatments. Furthermore, the terrigenic inputs increased phytoplankton abundance, community turnover rates, diversity, and resistance. Comparatively, the diversity index of phytoplankton increased by 82.61%, 73.83%, and 70.41% in the LT, MT, and HT treatments, respectively, in contrast to the CK treatment. However, phytoplankton abundance decreased by 6.99%, 15.55%, and 14.76% in the LT, MT, and HT treatments. Additionally, the resource use efficiency decreased by 1.94%, 5.16%, and 14.19% in the LT, MT, and HT treatments, respectively, compared to the CK treatment. These findings provide valuable insights into monitoring and managing the water ecology in Lake Changhu, offering a scientific basis for implementing effective management strategies.
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