Applicability of benthic diatom indices combined with water quality valuation for dish lake from Nanjishan Nature Reserve, Lake Poyang

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  • Junfei Yang, Nanchang Institute of Technology
  • ,
  • Yong Ji, Nanchang Institute of Technology
  • ,
  • Ruyu Yan, Nanchang Institute of Technology
  • ,
  • Xingchen Liu, Nanchang Institute of Technology
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  • Jie Zhang, College of Water Conservancy and Ecological Engineering, Nanchang Institute of Technology
  • ,
  • Naichen Wu
  • ,
  • Kai Wang, College of Water Conservancy and Ecological Engineering, Nanchang Institute of Technology

Benthic diatom indices developed in the Europe Union have been widely accepted as indicators of the trophic state and water quality in freshwater ecosystems. In China, most of the benthic diatom-based indices have not been widely tested or evaluated before. For this purpose, the water quality parameters and benthic diatoms community structures at 20 sample sites in the dish lake of Nanjishan Nature Reserve in Poyang Lake were investigated in this study and 18 widely-applied diatom indices were established. The statistical results indicated that most water quality parameters including Total Nitrogen (TN), Total Phosphorus (TP), ammonia nitrogen (NH4+), Chemical Oxygen Demand (COD) and Chlorophyll (Chl) were highly correlated with each other at a confidence level of 0.05. Water quality sampling sites from 8 lakes could be classified into 4 groups based on the integrated comprehensive scores using principal components analysis (PCA). Monitoring sites could also be divided into 4 groups based on clustering analysis with hierarchical methods for diatom dominant species in 20 sampling sites. According to the status of water ecological health recognition and box plot analysis in different water quality groups and diatom dominant species groups, only 3 diatom indices including the Biological Diatom Index (IBD), Specific Pollution Sensitivity Index (IPS) and Louis Leclercq Diatom Index (IDSE) demonstrated good evaluation suitability and good correlation within different water quality grades at the final stage. The above results revealed that IBD, IPS and IDSE were the most suitable diatom indices for the water quality evaluation of the dish lake in the Nanjishan Nature Reserve, Lake Poyang.

Original languageEnglish
Article number2732
JournalWater (Switzerland)
Volume12
Issue10
Number of pages16
ISSN2073-4441
DOIs
Publication statusPublished - Oct 2020

    Research areas

  • Benthic diatoms, Diatom index, Dish lake, Lake Poyang, Water quality evaluation

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