[2014年春季三峡库区神农湾浮游藻类演替原因分析]。

微生物学报 Pub Date : 2017-03-04
Hui Xu, Lianghon Long, Daobin Ji, Defu Liu, Linxu Song, Yujie Cui, Qingqing Su, Yanan Huang, Qing Wu
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引用次数: 0

摘要

目的:三峡水库蓄水后,神农湾部分河段出现藻华现象。方法:对三峡库区神农湾2014年(3月20日、4月13日、5月23日)赤潮期相关环境水动力因素进行监测。为了研究浮游藻类的演替,利用水稳定系数、真光深度和混合层深度分析了浮游藻类的分层和水动力特性。结果:共鉴定出浮游藻类6门38种(属)。藻华的敏感区为SN05 (677.677×105 cells/L)和SN06 (716.761×105 cells/L),且该时期浮游藻类生物量差异显著(方差分析,p)。结论:在营养充足的条件下,分层和水动力特性对浮游藻类有重要影响。三峡库区洪前降水期,流速成为抑制神农湾藻类生长的主要因素。
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[Causes of succession of planktonic algae in Shennong bay of Three Gorges Reservoir in spring in 2014].

Objective: Algal blooms occurred in some sections of Shennong bay after impounding of Three Gorges Reservoir.

Methods: Related environmental and hydrodynamic factors were monitored during the period of algal blooming season in 2014 (March 20, April 13, May 23) in Shennong bay, Three Gorges Reservoir. To study succession of planktonic algae, water stable coefficient, euphotic depth and mixed layer depth were used to analyze stratification and hydrodynamic characteristics.

Results: We identified 6 phyla, 38 species (genera) planktonic algae. The sensitive area of algal bloom was at SN05 (677.677×105 cells/L) and SN06 (716.761×105 cells/L), and the planktonic algae biomass during this period was significantly different (ANOVA, p<0.05). Moderate water temperature, adequate nutrients, weak stratification and poor mixing promoted the rapid growth and breakout of the diatom bloom with Cyclotella spp. as the dominant species in March. Further increase of water temperature, stronger stratification and decrease of dissolved silicate and mixing layer restricted the diatom growth. Chlorella spp. and Chlamydomonas spp. grew better in shallow mixed layer with rich nutrients and evident stratification. Then Chlorophycean bloom broke out with Chlorella spp. as the dominant species and Chlamydomonas spp. the next-dominant species. High biomass maintained in April. In May, algal bloom gradually vanished due to sharp fluctuation of water level and increase of velocity. Monitored maximum water velocity was 0.1141 m/s at 2 m depth, exceeded an optimal flow rate perfect for growth of planktonic algae.

Conclusion: Stratification and hydrodynamic characteristics had important effect on planktonic algae under the condition of adequate nutrients. Velocity became the main factor that inhibited the growth of algae in Shennong bay in pre-flood falling stage of the Three Gorges Reservoir.

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期刊介绍: Acta Microbiologica Sinica(AMS) is a peer-reviewed monthly (one volume per year)international journal,founded in 1953.It covers a wide range of topics in the areas of general and applied microbiology.The journal publishes original papers,reviews in microbiological science,and short communications describing unusual observations. Acta Microbiologica Sinica has been indexed in Index Copernicus (IC),Chemical Abstract (CA),Excerpt Medica Database (EMBASE),AJ of Viniti (Russia),Biological Abstracts (BA),Chinese Science Citation Database (CSCD),China National Knowledge Infrastructure(CNKI),Institute of Scientific and Technical Information of China(ISTIC),Chinese Journal Citation Report(CJCR),Chinese Biological Abstracts,Chinese Pharmaceutical Abstracts,Chinese Medical Abstracts and Chinese Science Abstracts.
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