[Impact and Mechanism of Medium and Small Flood Regulation in the Three Gorges Reservoir on the Phytoplankton in Tributary Bays].

Q2 Environmental Science
Rui Li, Xian-Qiang Tang, Xin-Bo Liu, Wen-Zhong Chen, Dan-Yang Wang, Yu-Feng Ren
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Abstract

The regulation of small- and medium-sized floods (RSMF) has become the main mode of regulation in the flood season of the Three Gorges Reservoir (TGR). To study the response of phytoplankton in the tributary bays of the TGR to the RSMF, a typical eutrophic tributary of the TGR, Xiangxi River, was investigated for the spatiotemporal distribution characteristics of phytoplankton and nutrients in the main and tributary streams from 2020 to 2021. The response characteristics of phytoplankton in the tributary bays to the RSMF were analyzed. The results indicated that during the RSMF, the chlorophyll a (Chl-a) in the water body of the Xiangxi River decreased with the increase in the water level in front of the dam, whereas during the reservoir impounding at the end of flood season, the concentration of Chl-a increased again. During the RSMF, the Chlorophyta and Diatoma were the main communities of planktonic algae in the Xiangxi River. The phytoplankton community changed with the RSMF. When the water level fluctuation increased, diatoms were the main species, whereas when the water level fluctuation was small, blue and green algae were the main species. The concentration of Chl-a was more sensitive to changes in TN concentration. When the flow velocity was >0.25 m·s-1 or the suspended sediment content was >10 mg·L-1, the concentration of Chl-a in the water was inhibited. After 2010, the typical outbreak time of algal blooms in the Xiangxi River Reservoir Bay shifted to the flood season, with only two non-flood season algal blooms. Further attention needs to be paid to the response of algal blooms in the reservoir to small- and medium-sized flood control during the flood season.

[三峡水库中小洪水调节对支流海湾浮游植物的影响及机理]。
中小洪水(RSMF)调节已成为三峡水库(TGR)汛期的主要调节方式。已成为三峡水库汛期的主要调节方式。为研究三峡库区支流海湾浮游植物对RSMF的响应,研究了三峡库区典型富营养化支流香溪河2020-2021年干支流浮游植物和营养盐的时空分布特征。分析了支流海湾浮游植物对 RSMF 的响应特征。结果表明,RSMF 期间,湘西水体叶绿素 a(Chl-a)随着坝前水位的升高而降低,而在汛期末水库蓄水时,叶绿素 a 浓度又有所升高。在 RSMF 期间,叶绿藻和硅藻是湘江浮游藻类的主要群落。浮游植物群落随 RSMF 的变化而变化。当水位波动增大时,硅藻是主要种类,而当水位波动较小时,蓝藻和绿藻是主要种类。Chl-a 的浓度对 TN 浓度的变化更为敏感。当流速为 0.25 m-s-1 或悬浮泥沙含量为 10 mg-L-1 时,水中 Chl-a 的浓度受到抑制。2010 年以后,湘江库湾藻华的典型爆发时间转为汛期,仅有两次非汛期藻华。需要进一步关注汛期水库藻华对中小型防洪的响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Huanjing Kexue/Environmental Science
Huanjing Kexue/Environmental Science Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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