生物学杂志 ›› 2020, Vol. 37 ›› Issue (4): 58-.doi: 10.3969/j.issn.2095-1736.2020.04.058

• 研究报告 • 上一篇    下一篇

蔺河口水库硅藻水华特征及影响因素研究

  

  1. 1. 长安大学 环境与工程学院, 西安 710061; 2. 陕西省环境科学研究院, 西安 710061;3. 中国科学院 南京地理与湖泊研究所, 南京 210008
  • 出版日期:2020-08-18 发布日期:2020-08-10
  • 通讯作者: 孙长顺,高级工程师,研究方向为水污染防治,E-mail: 478456578@qq.com
  • 作者简介:胡恩,博士研究生,主要研究方向为水生态系统同位素示踪,E-mail: huen777@163.com
  • 基金资助:
    陕西省博士后基金(2017BSHQYXMZZ10)

Characteristics and influencing factors of diatom bloom in Lin Hekou Reservoir

  1. 1. School of Environmental Science and Engineering, Chang′an University, Xi′an 710061;2. Shaanxi Provincial Academy of Environmental Science, Xi′an 710061; 3. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
  • Online:2020-08-18 Published:2020-08-10

摘要: 2017年4月,汉江流域岚河蔺河口水库突发水体泛深褐色的异常现象,在当地引发恐慌。针对此现象,从水质和藻类群落结构开展调查研究,探讨该水库水色突变的可能原因。结果显示蔺河口水库处于富营养化状态,藻类达到水华水平。藻类细胞密度以硅藻门、蓝藻门和隐藻门为主,其中硅藻门占浮游植物总细胞密度的90.4%;藻类生物量则以硅藻门、隐藻门和甲藻门为主,硅藻门占浮游植物总生物量的92%。硅藻门中,曲壳藻和针杆藻占主导地位,尤其是曲壳藻,平均占硅藻总生物量的98.2%。对于处于富营养状态的蔺河口水库而言,硅藻水华可能是引起水色异常的主要原因,而硅藻水华发生受营养盐浓度、气象和水文条件等因素协同控制。加强流域管理,降低营养盐负荷,有利于减少汉江流域水库硅藻水华发生的风险,保障南水北调中线工程供水水质安全。

关键词: 汉江流域, 蔺河口水库, 水体泛深褐色, 硅藻水华, 影响因素

Abstract: In April 2017, there was been an abnormal phenomenon of the “dark brown-water” in Lin Hekou Reservoir of Lanhe River, a tributary of the Hanjiang river basin, which caused panic within local residents. The water quality and the algae community structure were investigated to explore the mechanism for the “dark brown-water” in the reservoir. It was shown that the reservoir was eutrophicated and reached a heavy extent of algae bloom, and the dominating species were Bacillariophyta, Cyanophyta and Cryptophyta, of which, Bacillariophyta accounted for 90.4% of the total phytoplankton in terms of density; with respect to biomass, Bacillariophyta, Cryptophyta and Pyrrophyta were the top three phylum, and Bacillariophyta accounted for 92% of the total phytoplankton biomass. The predominant genera of diatom were Achnanthes exigua and Synedra spp., among which, Achnanthes exigua (98.2%) showed the highest abundance of dominance. Being eutrophic state of the Lin Hekou Reservoir, diatom blooms may be the main cause of “dark brown-water” and the diatom blooms are related to the factors of nutrient level, weather and hydrology conditions. With the aim of water safety of Central Line Project of South-to-North Water Diversion, catchment management and reduction of nutrients into reservoir are crucial for decreasing the risk of algae blooms in the channel-reservoir of Hanjiang river basin.

Key words: Hanjiang river basin, Lin Hekou Reservoir, dark brown water, diatom blooms, influencing factors

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