引用本文:潘雯雯,杨桂军,芮政,等.野外模拟扰动方式对太湖浮游植物群落结构的影响[J].环境科学研究,2020,33(6):1421-1430.
PAN Wenwen,YANG Guijun,RUI Zheng,et al.Effects of in-situ Simulative Mixing Modes on Phytoplankton Community Structure in Lake Taihu[J].Research of Environmental Sciences,2020,33(6):1421-1430.]
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野外模拟扰动方式对太湖浮游植物群落结构的影响
潘雯雯1, 杨桂军1, 芮政1, 钟春妮2, 秦伯强2, 杨宏伟2
1. 江南大学环境与土木工程学院, 江苏 无锡 214122;2. 中国科学院南京地理与湖泊研究所, 湖泊环境与科学国家重点实验室, 江苏 南京 210008
摘要:
浮游植物是水生生态系统的重要生产者,扰动是水体的固有特征.为探究扰动方式对浮游植物的影响,通过野外模拟试验探讨不同扰动方式(持续扰动和间歇扰动)对太湖浮游植物的影响,并在试验期间测定各扰动条件下浮游植物生长和群落结构变化情况.结果表明:①对照组、间歇扰动组和持续扰动组中浮游植物平均生物量分别为5.92、19.42、58.27 mg/L,平均细胞密度为1.06×108、1.23×108、3.48×108 L-1,持续扰动组浮游植物生物量和细胞密度显著高于对照组和间歇扰动组.②在间歇扰动组中,浮游植物优势种始终是微囊藻,其占比平均值为84.61%;对照组和持续扰动组中,浮游植物主要优势种由微囊藻逐渐转变为湖生伪鱼腥藻,其中微囊藻占比从试验开始时的77.84%到试验结束时分别降至4.72%和5.62%,而湖生伪鱼腥藻从试验开始时的0.55%到试验结束时分别升至94.40%和90.52%.③对照组、间歇扰动组和持续扰动组中Shannon-Wiener指数分别为1.02、1.03和1.63,持续扰动组显著高于对照组和间歇扰动组.研究显示,在该试验条件下,间歇扰动有利于维持微囊藻在太湖浮游植物中的优势地位,同时表明扰动方式显著影响太湖浮游植物生长和群落结构.
关键词:  间歇扰动  持续扰动  太湖  浮游植物  微囊藻  群落结构
DOI:10.13198/j.issn.1001-6929.2019.10.11
分类号:X524
基金项目:国家基金委创新群体项目(No.41621002);国家水体污染控制与治理科技重大专项(No.2012ZX07101-013-03)
Effects of in-situ Simulative Mixing Modes on Phytoplankton Community Structure in Lake Taihu
PAN Wenwen1, YANG Guijun1, RUI Zheng1, ZHONG Chunni2, QIN Boqiang2, YANG Hongwei2
1. Environment and Civil Engineering School, Jiangnan University, Wuxi 214122, China;2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
Abstract:
Phytoplankton are important producers of aquatic ecosystems, and mixing is an inherent feature of water bodies. An in-situ simulation experiment was conducted on the effects of different mixing modes (continuous mixing and intermittent mixing) on the phytoplankton community structure in Lake Taihu. The growth and community structure of phytoplankton were measured in this study. The experimental results showed that: (1) The average biomass of phytoplankton in the control groups, intermittent mixing groups and continuous mixing groups were 5.92, 19.42 and 58.27 mg/L, and the average cell density was 1.06×108, 1.23×108 and 3.48×108 L-1, respectively. The biomass and cell density of phytoplankton in the continuous mixing groups were significantly higher than those in the control groups and intermittent mixing groups. (2) In the intermittent mixing groups, the dominant species of phytoplankton was Microcystis spp., and the average abundance of phytoplankton was 84.61%. In the control groups and the continuous mixing groups, the dominant species of phytoplankton was changed from Microcystis spp. to Pseudanabaena limnetica. The abundance of Microcystis spp. in the control groups and the continuous groups varied from 77.84% at the beginning of the experiment to 4.72% and 5.62% at the end of the experiment. At the same time, the abundance of P. limnetica changed from 0.55% at the beginning of the experiment to 94.40% and 90.52% at the end. (3) The phytoplankton biodiversity index in the continuous mixing groups was significantly higher than those in the control group and the intermittent mixing groups, and the average values were 1.63, 1.02 and 1.03, respectively. The results of this study indicated that intermittent mixing was conducive to maintain the dominant position of Microcystis spp. among phytoplankton in Lake Taihu, and that the mixing modes significantly affected the phytoplankton community structure in Lake Taihu under this experiment condition.
Key words:  intermittent mixing  continuous mixing  Lake Taihu  phytoplankton  Microcystis spp.  community structure